Of the three lengthy cryptograms crafted by the Zodiac Killer, the 408 cipher mailed on July 31st 1969 was his introductory message to the public, proclaiming his intention to collect slaves for the afterlife. The cryptogram was a simple homophonic substitution cipher, cracked in a matter of days by schoolteacher Donald Gene Harden and Bettye June Harden (née Tischer) of Salinas, California. The Zodiac Killer's next character laden cryptogram appeared reactionary, in that the design of the 340 cipher on November 8th 1969 was much more complex, despite the fact it contained a contemporary message regarding the "phony" (Eric Weill), who rang into the Jim Dunbar TV Show on October 22nd 1969 and February 5th 1970 pretending to be the infamous Zodiac Killer. Although the design of the cipher was arguably more difficult, it is clear that the Zodiac Killer underestimated its complexity and failings, resulting in the contemporary message contained within it being diminished and compromised by the passage of time. 

​When the Zodiac Killer created his third lengthy cryptogram (in possibly May, 1971), containing yet another contemporary message about "phony" Eric Weill (and claimed additional "phony" Karl Francis Werner), the Zodiac Killer, this time, made sure his message would not be lost to the hands of time by manufacturing a cryptogram much simpler than the 408 cipher, by allotting just one ciphertext character to each plaintext letter. The only three times he deviated from this technique in the cryptogram was with the bold letter "G" that concluded the word "LISTENING" on the third row, and the letter "T" in "THE" and "FRONT" on the first and fifth row. The Zodiac Killer likely incorporated two deliberate errors on the first row when he used two misspellings within his "This is the Zodiac speaking" introduction. These deliberate misspellings, by adding and subtracting a plaintext letter, very likely created to add minor complexity, and prevent an immediate decoding of his cipher.  

Having used the letter "Z" in plaintext for the first time in three cryptograms, it seemed that the Zodiac Killer couldn't resist using the "sun cross" character (similar to his crosshairs) to represent the initial of his pseudonym. This becomes apparent when he uses this individual character to sign off his accompanying letter, rather than the traditional crosshairs or letter "Z".

Victims of serial killers ​make up a very small percentage of the total number of murder victims each year. Communications written by such killers (and accompanying hoaxers) are even less. So imagine the percentage of serial killers and their accompanying hoaxers that mail communications to authorities with cryptograms and codes included within the correspondence. Now imagine two cryptograms contained within two letters unreleased into the public domain, both of which have many crossover features, that both use the ciphertext character "7" to represent the plaintext character "A" in the code, with both claiming to be from the Zodiac Killer, and both using the "sun cross" in their respective codes. These two letters were mailed from Fairfield, California (1971) and Albany, New York (1973). Now imagine mailing a 148 character cryptogram in 1971 using the root word "phony" that was previously used to describe the Jim Dunbar TV Show hoaxer Eric Weill in the headlines of a newspaper article on February 6th 1970, who was the focus of the 340 cipher solve in 2020, when the Zodiac Killer wrote "That wasn't me on the TV show" and effectively proclaimed the caller a hoaxer. A 340 cipher message that wasn't known to anybody else but the Zodiac Killer in 1971. Regardless, we must not let facts get in the way of the long told Zodiac narrative. 

David Oranchak has just released another excellent Youtube video on his Let's Crack Zodiac series, examining the numeric codes of Theodore Kaczynski, the Unabomber, who killed three and injured twenty-three in a seventeen year reign of terror between 1978 and 1995. David Oranchak has delivered the often complex and difficult topic of cryptography to the masses by attempting to simplify this topic through his visual presentations, orchestrated in such a way, it elevates the understanding of the many who once found the art of cryptography perplexing and impenetrable. One of the key members of the team that finally broke the Zodiac Killer's 340 cipher after fifty-one years, alongside Sam Blake and Jarl Van Eycke,

David Oranchak has sought to demystify the specialized skills of codebreaking through eighteen well produced videos. Although some uncharitable individuals claim the hard work in breaking the 340 cipher was achieved predominantly through the use of computers, this overlooks the fact that we have had these powerful computers for many years with no resolution until 2020, the requirement to develop new systems such as "zkdecrypto", and the human input required to recognize the Zodiac Killer's language as it emerges from the noise. These three gentlemen achieved what every other person failed to surmount in over fifty years - and for this - they deserve all the accolades they have been rightly bestowed. 

The 340 message, claimed by many to be another rambling and meaningless collection of Zodiac tropes, has in fact, opened the window to many other Zodiac Killer communications such as the first Fairfield letter mailed on December 7th 1969 and the third Fairfield letter mailed on or around May 2nd 1971, both containing cryptograms known as the Z38 and Z148 respectively (the latter having been solved). Both of these communications were related to the 340 cipher through coding and messaging, despite the 340 cipher solution being decades away from being solved. The Z38 appeared to know the wording in the 340 cipher before the code was broken, and the text in the accompanying letter seemed to pre-empt the wording in the Melvin Belli letter mailed on December 20th 1969, just thirteen days later. The Fairfield letter on December 7th 1969 also pre-empted the phone call to an Oklahoma radio station later that day, in which the author of the letter and phone caller both mocked the caller to the Jim Dunbar Show and Melvin Belli on October 22nd 1969. The phone caller to Oklahoma, mimicking the person who rang into the Jim Dunbar Show, also stated he left California because "it got too hot for me", just like phone caller to the Palo Alto Times newspaper, who stated he had left San Francisco because "because I'm too hot there", less than a day before the Jim Dunbar TV Show. If that isn't enough evidence that the Zodiac Killer was the responsible, we have the solved message in the Z148 calling out both Karl Francis Werner and Eric Weill (the Jim Dunbar caller) as phonys, just like the message in the 340 cipher calling out Eric Well by stating "That wasn't me on the TV show". The Jim Dunbar TV show, in which a second phone call was received on February 5th 1970, from somebody that the San Francisco Chronicle and homicide detectives described as a phony. 

To ascertain whether a communication is authentic or unproven, we must get away from consistently using the reasoning of "handwriting and tone" as a throwaway line to examine Zodiac communications in a matter of minutes. The interconnectivity of Zodiac communications must be examined through the picture created by the Zodiac Killer throughout many years and multiple correspondences and phone calls, just like the story of the San Jose murders which spanned the time period of August 3rd 1969 to July 13th 1971, when the Zodiac Killer mailed the Monticello card to the San Francisco Chronicle.

The interconnectivity between the Monticello card and the Z148 character cipher (and Pines card), the interconnectivity between the Z148 cipher and Albany letter code mailed in 1973, and the interconnectivity between the second Fairfield letter mailed on December 16th 1969 to the phone call delivered to the San Jose Highway Patrol on December 19th 1969, are just a fraction of the strands in the spider web that link these occurrences together. Just staring at a letter for a handful of minutes and declaring it a hoax, is inadequate, when we consider that the Zodiac Killer was traveling on a journey of murder and domestic terrorism spanning many years. To view the whole picture, please open the links provided in this article.

I am fairly confident that the Z38 code mailed on December 7th 1969 is somehow related to the 340 and 148 character ciphers through its messaging. Both the Z340 and Z148 ciphers referenced Eric Weill (the caller to the Jim Dunbar Show), by stating "That wasn't me on the TV show" and "stop listening to phonys" - and the Z38 code was mailed on the same day that somebody rang the Oklahoma radio station mimicking Eric Weill. My contention is that all three were the Zodiac Killer.

​I am not confident I can crack the Zodiac Killer's Z38 cipher because, despite having some limited knowledge of cryptography, this pales into insignificance when compared to individuals such as David Oranchak, Sam Blake and Jarl Van Eycke, who ultimately broke the Zodiac Killer's masterpiece cipher. The recognition of the phrase "gas chamber" in the cryptogram was pivotal in understanding that the Zodiac Killer referenced recent newspaper articles (or the Jim Dunbar TV show) which detailed this very subject pertaining to Zodiac's capture. If we run with this concept, it may help to unearth the message in the Z38 code, which may (or may not) hold vital information of a contemporary nature and unlock the fifth of eight known enciphered messages. I have a strong belief that David Oranchak could make some valuable observations and inroads into the Z38 cipher if he chooses to tackle yet another Zodiac mystery, and thereby, attempt to close another chapter in this intriguing story.

As shown numerous times before, we can usually find the inspiration for Zodiac communications by looking at the most recent newspaper articles published in the Bay Area or Los Angeles. The November 21st 1969 letter to the San Jose Police Department was possibly directed at the recently widowed Diane Kennedy Pike, whose husband James Albert Pike had met an unfortunate death in Israel in September (information provided by Cragle). The letter caused enough alarm to institute 24-hour surveillance on the young woman and her residence. Information regarding this letter is sparse, but the language adopted in this communication is taken directly from the last San Francisco Chronicle newspaper article on November 13th 1969 entitled Zodiac 'Legally Sane', featuring the Zodiac Killer's 340 cipher and investigators attempts to snag the murderer of five.    

The newspaper snippet on the left reads "Through physical clues Zodiac has clumsily left behind at crime scenes and bits and pieces of information about himself he has inadvertently revealed in letters sent to The Chronicle, police feel sure there will be no doubt they have the right man in custody when an arrest is made". Eight days after this newspaper article was released, and thirteen days after he had claimed seven victims (the canonical five and the two San Jose murders of Snoozy & Furlong), the Zodiac Killer wrote to the San Jose Police Department and responded to "there will be no doubt they have the right man in custody when an arrest is made", by writing "There's no doubt I will do my Thing". The Zodiac Killer was clearly confident that no arrest was forthcoming, and his reign of terror would continue by doing his "Thing". His chronological list of victims by using months of the year would continue, when he wrote November=8 in his latest letter. He also added a short six character code of ~+62+~.  

His next letter, postmarked December 7th 1969 from Fairfield, was shown to be authentic by pre-empting the pleading nature of the Melvin Belli letter and his use of another code of 38 characters. This code contained similar characters to the 340 cipher, unlike the following 13-Symbol and 32-Symbol ciphers. It opened the door to the possibility that the 38 character code was somehow related to the 340 cipher and maybe contained a clue to its construction. Druzer, an avid and diligent Zodiac researcher, mailed me the 38 character code deciphered with the 340 cipher key. The result is mostly garbled, but he drew my attention to the final line of both codes ending in "death". The Zodiac Killer only took a 4+ horizontal combination of characters from the 340 cipher to the 38 character code on two occasions. Those were HER> and AIKꞮ+, which spelled the standalone words of IRON and DEATH before the diagonal shift was applied to the 340 cipher to reveal the message. Despite the last two rows of the 340 cipher being a mixture of forward and backward reading words, the word "death" sits at the end of both the 340 and 38 character ciphers, indicating that this word likely concludes the message in each instance. 

Other horizontal words do exist in this format, however, the Zodiac Killer gave us 4 and 5 characters which bound the 340 and 38 character ciphers together, and both formed English words. The Zodiac Killer began and ended his 38 character code with two prominent sections from the start and end of the 340 cipher, both of which contained visible words before any shift was applied (the final word remaining static). This may be another observation, which confirms to the doubters the December 7th 1969 letter as an authentic Zodiac communication. Unless of course, the 38 code hoaxer identified two passages of 4 and 5 characters from the undeciphered 340 cipher, that just happened to accidentally find two English words after the 340 key was applied. This hoaxer would also have to guess that by separating the prominent ZO∆AIKꞮ+ characters on the bottom line of the 340 cipher, into AIKꞮ+ on the bottom line of the 38 character code, he would be reducing these characters to create something meaningful. He apparently did. By separating these characters into the five visible at the end of the 38 character code, he created the word "death", just like the solved 340 cipher. Druzer pointed out the same thing, stating "The most curious/compelling feats are that the author isolated actual words, most notably death, and that he refrained from copying Zodaik, which would certainly be expected of a hoaxer". In other words, he dismantled the ZO∆AIK element, while leaving Ɪ+ in place, to form "death" as the final word on the 38 character code. This appears to show knowledge of the hidden message in the 340 cipher. 

The above image from the San Francisco Chronicle on November 13th 1969 shows the correlation on three rows of the 38 character code to the 340 cipher. We have 4, 5 and 5 characters from three rows of the 38 character code, organized in the correct order to three rows on the 340 cipher. The crucial 10th row of the 340 cipher which begins the second section of the 3-part cipher (9, 9 and 2), contains the four symbols of ~+62+~ in the correct order (and FB which numerically equals 62). Both the November 21st 1969 and December 7th 1969 letters were unreleased to the public, so it would be difficult to envisage how two different authors would choose to supply two relatively short codes that mimicked important features of the 340 cipher independent of one another. The three rows of the Z38 highlighted in blue rectangles above, all either begin or end a row on the 340 cipher - as does the six character code of the November 21st 1969 letter. Was the 38 character code on December 7th 1969 a clue to the construction of the 340 cipher or somehow related to the message ultimately found within it? If so, then the short code of ~+62+~ in the November 21st 1969 letter could be somehow related to the 340 cipher also. The December 16th 1969 letter, also mailed from Fairfield, contained another short code of five characters. This completed a quartet of puzzles from the Zodiac Killer in just over a month.

​The Zodiac Killer was likely reading this newspaper article on November 13th 1969 when he used the wording "There's no doubt I will do my Thing", so it's perfectly feasible that the presence of his 340 cipher prominently displayed within this article, may have been the inspiration to provide further codes based upon its construction. The newspaper article concluded with "Amateur cryptographers by the hundreds were at work trying to decode the cryptogram from Zodiac published in yesterday's Chronicle. It was an amateur - a Salinas teacher - who cracked Zodiac's cipher message in August to which he said the people he killed would serve him as his slaves in paradise. One cryptographer, who has studied the latest message, says it definitely contains word patterns hidden in the 340 symbols. "There is a definite message" he said. "Testing shows it is not just gibberish. Once that is determined then it's just a matter of patience before it pieces itself together". Did the Zodiac Killer take note of this section and provide "bits and pieces" in his next two codes to help in its decryption? 

The San Francisco Chronicle ran a very clever newspaper article on October 22nd 1969 challenging the Zodiac Killer to issue another cryptogram that would surely contain his name. However, they did this hoping that the Zodiac Killer would create a cipher down the path they had guided him towards. By dropping the name Edgar Allan Poe into their challenge, they were relying on the Zodiac Killer choosing a cipher technique described in the essays of the American writer and poet, thereby increasing their chances of solving it.

​The murderer of five not only responded by employing the first cipher technique described in Poe's A Few Words on Secret Writing to create the 340 cipher, but also inserted one of Poe's poems into the message. Here is a portion of the newspaper article: "Dr Marsh told the Examiner today: "The killer wouldn't dare, as he claimed in letters to the newspapers, to reveal his name in the cipher to established cryptogram experts. He knows, to quote Edgar Allan Poe, that any cipher created by man can be solved by man. Zodiac has not told the truth in his cipher messages to the Examiner, the Chronicle and the Vallejo Times-Herald. Zodiac has not done this, because to tell the complete truth in relation to his name -in cipher code - would lead to his capture. I invite Zodiac to send The American Cryptogram Association a cipher code - however complicated - which will truly and honestly include his name".  

The first section of Poe's essay mentioned the encryption technique of using scytala to conceal a message. In cryptography, a scytale (also transliterated skytale), is a tool used to perform a transposition cipher, consisting of a cylinder with a strip of parchment wound around it, on which is written a message. This online scytale decoder can be used to unearth the message in the Zodiac Killer's 340 cipher, which used a period 19 shift. Quite the coincidence that the Zodiac Killer would employ a similar technique from the very first portion of the essay 'A Few Words on Secret Writing'. This alone is not evidence of a connection between the newspaper article, Edgar Allan Poe and the Zodiac Killer, but the following observations may change your mind.     

Five months later, the Zodiac Killer would then mail the "My name is" cipher on April 20th 1970, apparently responding to Dr. Marsh directly, with "This is the Zodiac speaking. By the way have you cracked the last cipher I sent you? My name is...."  In the essay 'A Few Words on Secret Writing', the second cipher technique described by Poe involves splitting the alphabet into two parts of 13, A to M, and N to Z. The Zodiac Killer's code this time contained 13 characters, beginning with A and ending with M.

But what is really interesting, is that the essay then suggests the notion of a perpetually shifting alphabet by creating two concentric circular pieces of pasteboard, with one placed inside the other and fixed, while the other can rotate. On each, the alphabet would be written (or random characters). By shifting the outer circle a certain number of spaces, different letters can represent others in the message. Bearing in mind the Zodiac Killer created three circled 8's, I considered the idea of placing Zodiac's 13 characters in two concentric circles with the characters aligned. In other words, A on the outer circle aligned with the A on the inner circle ,E on the outer circle aligned with the E on the inner circle, N on the outer circle aligned with the N on the inner circle, etc. Then I just shifted the outer circle 8 spaces clockwise, so that the 8's aligned with three new characters. Those characters were ME and the Zodiac crosshairs (shown above in the red boxes). 

Ordinarily, this would appear a little crude and unconvincing, if it wasn't for the fact the Zodiac Killer mailed the Exorcist letter on January 29th 1974, switching from his usual crosshairs equalling his victim total, to "Me" corresponding with his victim total. He often allotted SFPD=0, while giving himself the latest victim total (10 in the April 20th 1970 letter). If "Me" corresponds to a victim total and his crosshairs correspond to a victim total, then "Me" corresponds to the crosshairs (and Zodiac). The shifting of the 13 character cipher by a factor of 8 to create the message "Me (crosshairs), would be similar to the period 19 shift employed in the 340 cipher.

The Zodiac Killer must have known that by creating a 13 character code, he was making it practically unsolvable using standard cryptographic methods. By using this method, employing a simple "shift of 8" technique, we at least get a crude message that he used later in the Exorcist letter: "This is the Zodiac speaking. By the way have you cracked the last cipher I sent you? My name is Me (crosshairs)"   

The Zodiac Killer likely mailed this communication knowing it would arrive at the San Francisco Chronicle offices on April 21st 1970, which tallies with the only date supplied in the essay 'A Few Words on Secret Writing'. The Chronicle stated on April 22nd 1970 that "in a letter received yesterday, Zodiac claims he has killed again". A letter dated April 21st was noted by Edgar Allan Poe after a challenge had been laid down in Graham's Magazine. The responder to the challenge stated "In the April number of your magazine, while reviewing the translation by Mr. Walsh of “Sketches of Conspicuous Living Characters of France,” you invite your readers to address you a note in cipher". This was reminiscent of the direct challenge given to Zodiac by Dr. Marsh, to encode his name in cipher form.  

The Zodiac Killer would almost certainly have been aware that Edgar Allan Poe was a poet, so it would be rather fitting had Zodiac incorporated one of Edgar Allan Poe's poems into one of his ciphers or codes. We had to wait 51 years to find the answer to this question. In December 2020, David Oranchak, Sam Blake and Jarl Van Eykce cracked the 340 cipher, which ended with the likely message of "I AM NOT AFRAID BECAUSE I KNOW THAT MY NEW LIFE IS DEATH. LIFE WILL BE AN EASY ONE IN PARADICE". The moving epitaph to his recently deceased wife, written by Edgar Allan Poe, was delivered in the form of poetry and entitled "To One in Paradise". 

​Are all these connections to Edgar Allan Poe a coincidence?  

On October 22nd 1969, the Zodiac Killer (or somebody claiming to be the Zodiac Killer) rang the Oakland Police Department requesting an airing on the Jim Dunbar TV Show with either Melvin Belli or Francis Lee Bailey, two high profile celebrity lawyers of the day. Unfortunately this never materialized, with Zodiac Killer hoaxer Eric Weill taking the limelight and ringing into the KGO Radio Station in San Francisco that same morning. The Zodiac Killer would react to this when he enciphered a message in the 340 cryptogram on November 8th 1969, stating "That wasn't me on the TV show".  As time went by, the narcissistic traits of Zodiac realized that by focusing his attention towards high profile individuals such as Melvin Belli and Paul Avery, it would inevitably garner more attention for himself. But this may not have been the only time the Zodiac Killer responded to a TV show by creating a cryptogram.

The Zodiac Killer mailed two letters on October 28th 1987 to the Vallejo Times-Herald and San Francisco Chronicle, so it had been nearly three years since any confirmed correspondence had arrived at any newspaper offices, when on September 25th 1990, somebody insinuating he was the Zodiac Killer mailed the Celebrity Cypher postcard to the Vallejo Times-Herald containing a 63 or 64 character cryptogram. This correspondence was reminiscent of the April 20th 1970 code mailed by the Zodiac Killer, as it too promised a name at the foot of the postcard and the address side of the communication. Both the April 20th 1970 letter and September 25th 1990 postcard tempted us with a 13 character name. The final three words on the September 25th 1990 message were highly suggestive of the words "My name is". We know that the Zodiac Killer was often triggered into writing to the newspapers because of recent published articles that featured him, but at this point in time (after nearly 3 years), the newspaper articles about the Zodiac Killer had become extremely threadbare. Therefore, the pool of newspaper articles that triggered the September 25th 1990 postcard shouldn't be too difficult to find. This cryptographic postcard message was also highly relevant to the 340 cipher mailed on November 8th 1969.

The 340 cipher was a direct response to Jim Dunbar, an American radio program director, talk show host and news anchor, and Melvin Belli, a flamboyant lawyer, writer and actor. The Zodiac Killer, in this instance, took the opportunity to reply to the Jim Dunbar TV Show with his message concealed in code. He may have done exactly the same on September 25th 1990, because one month before the Celebrity Cypher was mailed, the Sally Jessy Raphael TV Show featured the story of the Zodiac Killer with three high profile guests, including Robert Graysmith (author of the 1986 book Zodiac), James Fox (professor of criminal justice at Northeastern University in Boston) and Pam Huckaby (sister of murder victim, Darlene Ferrin). So, there is every chance the Zodiac Killer responded to a second TV show with another cryptographic message. It is important to note, that when the Celebrity Cypher was mailed, nobody knew that the Zodiac Killer's 340 cipher was a response to the Jim Dunbar TV Show. Therefore, the timing of the postcard to the Vallejo Times-Herald on September 25th 1990, a matter of weeks after the Sally Jessy Raphael TV Show and the accompanying newspaper article in the Vallejo Times-Herald, which featured the revelations on the TV Show, is a strong indicator that the postcard and TV show are relevant to one another. Especially when you consider the contents of the newspaper article.

The newspaper article began with "A former Vallejo woman related to one of the Zodiac's victims told a national television audience Wednesday that she is being harassed with death threats from the serial killer. Pam Huckaby, a guest on Sally Jessy Raphael's talk show, said that just days before she was to leave for New York to film Wednesday's show, she was assaulted and knocked unconscious in her home near Antioch". The newspaper continued "The killer is called the Zodiac because of his cryptic messages, loaded with astrological symbols, to the news media and investigators". But here is the crucial part of this newspaper article, where it stated "In a 1986 Times-Herald interview, Huckaby said she received annual calls from somebody claiming to be the Zodiac who said "This is the Zodiac speaking. I have collected the slaves I needed to collect. Now I'm going after the family". The Zodiac Killer in his 340 cipher stated "I am not afraid of the gas chamber because it will send me to paradice all the sooner. I now have enough slaves to work for me where everyone else has nothing when they reach paradice". In summary, we have two cryptographic communications, very likely a response to celebrities appearing on a TV show, both occurring just weeks after the show aired. 

​Below are two possible decodings of the Celebrity Cypher postcard, bearing in mind Pam Huckaby was the focus of the Sally Jessy Raphael Show and subsequent Vallejo Times-Herald newspaper article.

If that wasn't enough, the author of the Celebrity Cypher on September 25th 1990 misspelled the address of Vallejo Times-Herald, using "Vallejo Times Herold", just as the Zodiac Killer had done on July 31st 1969 (and the 1969 envelope wasn't in the public domain in 1990). The October 28th 1987 envelope was also likely misspelled "Herold" as well. That is three communications to the Vallejo Times-Herald spanning 21 years, all probably misspelled the same way. ​

A few months after the Celebrity Cypher was received by the Vallejo Times-Herald, beginning in 1991, another series of cryptograms would be mailed concerning another TV show host. John Edward Walsh Jr. is an American television personality, and victim rights advocate, and the host/creator of America's Most Wanted. Beginning in 1991, John Walsh started receiving a sequence of sinister letters and cryptograms that many have considered may have been authored by the infamous Zodiac Killer. The title of the fifth cipher, accompanied by a 180 character cryptogram, read "Hi!, Remember me?", while another was signed by the pseudonym of "Scorpion". The author of these latest series of letters is unknown, but we have three high profile TV hosts, connected closely to several cryptograms, with the most recent offerings mailed in 1990 and 1991, just months apart. 

Bearing in mind the propensity of the Zodiac Killer to respond to recent newspaper articles about himself, it would have crossed the minds of Zodiac researchers that the hidden message in the 340 cipher may have concerned the recent attempted poisoning of schoolteacher Daniel Williams by somebody claiming to be the Zodiac Killer. The logical conclusion may have been a hidden message regarding the murders of Kathie Snoozy & Debra Furlong, on account of the Zodiac Killer raising his victim count from five to seven in the Dripping Pen card. However, it ultimately transpired to be a rebuttal or rejection of Eric Weill, the Zodiac hoaxer who rang into the Jim Dunbar TV Show on October 22nd 1969. The Zodiac enciphered the message "That wasn't me on the TV show" and "I am not afraid of the gas chamber", based entirely upon the Zodiac imposter and the interaction with Jim Dunbar and Melvin Belli.

When the Zodiac Killer's seventh cipher/code was mailed shortly after the Snoozy & Furlong murders saw an arrest in the case, on April 30th 1971, it too would ultimately prove to contain a contemporary hidden message concerning the arrest and questioning of Karl Francis Werner. The 148 character cipher was probably mailed shortly after the arrest of Werner (likely May 2nd 1971 or just after). This cipher called out Werner as a phony, utilizing the wording of Inspector David Toschi and the newspaper headlines regarding a second phony Zodiac call on February 5th 1970, likely from Eric Weill once again. In fact, the Zodiac Killer didn't express an individual reference to Karl Francis Werner as a phony, he utilized the plural, enciphering "phonys" to bind Werner and Weill under one banner. In other words, the Zodiac Killer was calling out Eric Weill in the 148 character cipher, just as he had done in the 340 cipher on November 8th 1969 (through rebuttal). The 148 character message and accompanying letter was attempting to maintain his claim, not only to his perceived ownership of the Snoozy & Furlong murders, but the recent murder of Kathy Bilek on April 11th 1971, also accredited to Karl Francis Werner. The fact that both the 340 and 148 character ciphers indirectly referenced Eric Weill, inextricably links them to the same author, bearing in mind the 340 cipher was unsolved when the 148 character cipher was created and mailed to the San Francisco Chronicle. 

Based on the Zodiac Killer's ability to use phrases from newspapers many months and years ago when composing a new letter, there is every chance the Zodiac Killer kept a scrapbook of newspaper cuttings about himself. In the newspaper clipping above, it stated "Homicide detectives later listened to a tape recording of the conversation and concluded that "Sam" was a phony". In the newspaper clipping below, with respect to the apprehension of Karl Francis Werner, it stated "Late yesterday he was undergoing questioning. The detectives would not reveal what statements, if any, he had made concerning the killings of the three girls". Therefore, it is with little surprise, the Zodiac Killer would respond to the April 30th 1971 article below, by urging that law enforcement "stop listening to phonys".     

The 340 cipher was unbroken by the time the 148 character cipher was mailed, so this probably explains why the Zodiac Killer reverted back to an extremely simple cipher in 1971. Having another message carrying a contemporary message lost in time, was probably not the ideal scenario for the Zodiac Killer. By signing off his accompanying letter in 1971 with a sun cross symbol, he was probably giving us a clue to his signature of "Z", because this symbol featured only once in the cipher, and it represented the plaintext letter of "Z" beginning the pseudonym "Zodiac". Quite a clever addition by the Bay Area murderer. The Zodiac Killer would further give us an eighth cipher/code on August 1st 1973, when the Albany letter was mailed with coding extremely similar to the one shown below.

In his very first communications, the Zodiac Killer wrote three letters to the San Francisco Chronicle, San Francisco Examiner and Vallejo Times-Herald on July 31st 1969, and fully expected to receive front page coverage, demanding "I want you to print this cipher on your frunt page by Fry Afternoon Aug 1-69, If you do not do this I will go on a kill ram page Fry night that will last the whole week end". After all, he had now committed the murders of David Faraday, Betty Lou Jensen and Darlene Ferrin, while seriously injuring Michael Mageau. He again reiterated the importance of publicity when the August 4th 1969 Debut of Zodiac letter arrived at the San Francisco Examiner offices, stating "I was not happy to see that I did not get front page coverage". This trend would continue in the Dripping Pen card on November 8th 1969 when he asked politely "Could you print this new cipher in your frunt page", and when the Los Angeles letter was mailed on March 13th 1971, declaring "The reason I'm writing to the Times is this, They don't bury me on the back pages like some of the others". By August 4th 1969 he had killed three, nearly killed another, sent four letters and created a 408 character cipher formed of three parts - but despite this - the two main newspapers in the Bay Area relegated his cipher offerings to page four and page nine in the San Francisco Chronicle and San Francisco Examiner respectively. The Zodiac Killer was probably wondering what more he had to do to achieve the front page coverage his crimes and communications merited. The answer would come sharply into focus, when two days after he announced himself to the world as "Zodiac" - and while he was scouring the newspapers for any progress on his 408 cipher - the San Francisco Chronicle wrote a comprehensive article on the front page of their newspaper featuring the brutal slayings of Kathie Reyne Snoozy (15) and Debra Gaye Furlong (14) in San Jose on August 3rd 1969. The two young teenage girls were brutally stabbed countless times as they picnicked atop an oak grove in Alamedan Valley.        

The father of one of the girls, Glen Furlong, spoke of some unsettling phone calls in the aftermath of his daughter's murder, stating "The individual or individuals who did this either had to be deranged or high on dope or something of that nature, They didn't know what they were doing. It was such a senseless killing. On several occasions people have called and as soon as we answer, they hang up". he said in bewilderment. At the foot of the San Francisco Chronicle article, it mentioned the surviving Furlong children and described the funeral services for both girls (see above). This section of the San Francisco Chronicle publication would be crucial regarding a phone call to the San Jose Highway Patrol by the Zodiac Killer on December 19th 1969 and a postcard mailed to the San Francisco Chronicle on July 13th 1971, both of which were inspired, in part, by this section of the August 6th 1969 San Francisco Chronicle newspaper,

The Zodiac Killer, having created terror in Benicia and Vallejo - and having sent four communications to date - noticed that the Snoozy & Furlong murders received front page coverage, while he received inner-page status. Is it really any surprise that the Zodiac Killer reappeared on the shores of Lake Berryessa on September 27th 1969, armed with a large knife and wearing an ominous executioner's costume. Dr. John E. Hauser, Santa Clara county's chief medical examiner and coroner, stated of the Snoozy & Furlong murders  "I've never seen a case with this many stab wounds. You know, I've been in this profession a long time and sometimes I think I'm rather callous, but when I saw these girls, believe me it was terrifying. The Nazi sex mutilations during World War II were nothing compared to what was done to these young girls". The Zodiac Killer had to perform an attack that would shock, so it's not difficult to understand why he ramped up the terror in the manner he did, knowing that a close-quarter attack should secure him the front page coverage he felt he warranted. After the attack on Bryan Hartnell and Cecelia Shepard, the Zodiac Killer traveled back up the hill and wrote "Vallejo 12-20-68, 7-4-69, Sept 27-69 - 6:30. by knife" on the car door of the young couples' vehicle. The addition of "by knife" was effectively saying to law enforcement "I've now killed with a knife, do I now get front page coverage like the San Jose murders". The plan worked perfectly, because the Lake Berryessa attack had the added advantage of him being linked to the murders of Kathie Snoozy and Debra Furlong. Something he would capitalize on in the Dripping Pen card on November 8th 1969, when he upped his victim count to seven and added the month of August to his chronological list of murder months.  

The Zodiac Killer knew that just committing an attack "by knife" and adding "Aug" to his Dripping Pen card, he may need more reinforcement to convince law enforcement he was responsible for the Snoozy & Furlong murders, so kept on with the San Jose angle by mailing a letter to the San Jose Police Department on November 21st 1969. A letter that would again promise more mayhem, by threatening a woman in San Jose and force police to instigate 24-hour protection to quell the possibilty of further attacks. But it didn't stop there.

On December 16th 1969, the Zodiac Killer mailed a letter from Fairfield to the newspapers, threatening to kill 38 cops by targeting 9 in Sacramento, 8 in Oakland, 8 in Napa, 6 in Vallejo, 3 in Fairfield, 3 in San Francisco and 1 in San Jose. The Zodiac Killer would include San Jose once again. This letter was withheld from the newspapers, making it fairly obvious that the person who rang the San Jose Highway Patrol on December 19th 1969, was the same person who authored this letter. 

On December 19th 1969, the Zodiac Killer again threatened multiple cops, making a phone call to Sergeant Robert Rengsdorff of the San Jose Highway Patrol, stating "I am going to kill five of you officers and a family of five between now and Monday".  The Zodiac Killer had made a list of cops he wanted to kill on December 16th 1969, but would up his San Jose total from one to five on December 19th 1969, adding that he also wanted to kill a family of five in San Jose (which is very specific}. This is where the San Francisco Chronicle article from August 6th 1969 comes into play. The article heavily featured Glen Furlong, who spoke about his daughter and the unsettling phone calls he was receiving. The article also mentioned his wife and their three children,  by stating "The other Furlong children are Glen, 16; Floyd, 12, and Pamela, 11". This was almost certainly the family of five the Zodiac Killer was referring to, staying relevant in San Jose, and keeping with tradition by never referring to his victims or potential victims by name. As stated earlier, the relevance of the San Francisco Chronicle article would again resurface on July 13th 1971. 

On October 27th 1970, the Zodiac Killer would mail the Halloween card, upping his victim count to fourteen, but chose to write 4-TEEN as an alternative, to include the only four teenagers he was claiming thus far. Those four were David Faraday (17), Betty Lou Jensen (16), Kathie Snoozy (15) and Debra Furlong (14). Seven months later (probably early May, 1971), the Zodiac Killer mailed the 148 character cipher and letter in response to the recent arrest and interrogation of Karl Francis Werner (18) for the murders of Kathie Snoozy and Debra Furlong, as well as the recent murder of Kathy Bilek (18) in Saratoga on April 11th 1971. The headlines stated San Jose Student Held in Slaying of Three Girls, San Jose Student Held in Slaying of 3 Girls and Youth Arraigned in Knife Slayings of Three Girls.  Paul Avery of the San Francisco Chronicle wrote "He (Werner) was immediately advised of his rights concerning any statements he may make and legal representation to which he is entitled, the detectives said. Werner was then taken to the scenes of the crimes. Late yesterday he was undergoing questioning. The detectives would not reveal what statements, if any, he had made concerning the killings of the three girls".

​The Zodiac Killer, having invested nearly two years linking himself to the Snoozy & Furlong murders, could now abandon his connection to the two young teenagers, or continue the facade, and now claim all three murders, which included Kathy Bilek. It was either all three, or none at all. His choice became apparent when the 148 character cipher included in his 1971 letter was deciphered. It read "T(h)is (is) the Zodiac Speacking. Why can't you stop me. I can't stop killing. Stop listening t(o) phonys. If this is not on the front page in a week I will skin 3 little kids and make a suit from the skin". The Zodiac Killer was urging investigators not to listen to Karl Francis Werner, referring to him as a "phony". Bearing in mind the newspaper headlines of "San Jose Student Held in Slaying of 3 Girls", it wasn't a surprise the Zodiac Killer was threatening to further "skin 3 little kids", adding in his letter that he would "send a patch of human skin if their was some left over". All three girls in San Jose and Saratoga were stabbed in excess of 100 times, so it doesn't require much imagination to understand the notion of little skin being left over. However, the story doesn't end there. The Zodiac Killer now had to add Kathy Bilek to his ever-increasing victim total. 

This is where the San Francisco Chronicle newspaper article from August 6th 1969 comes into play for the third time. An article that probably inspired the Lake Berryessa attack and the December 19th 1969 payphone call threatening a family of five. In the same section of newspaper under the subheading of "CHILDREN", the article detailed the burial sites of both Kathie Snoozy and Debra Furlong, but only one was the phonetic namesake of Kathy Bilek. The article read "The other Furlong children are Glen, 16; Floyd, 12, and Pamela, 11. Furlong said he did not know and had not yet talked to Kathy's parents, Mr. and Mrs. Wilfred Snoozy. Both Snoozy, a carpet layer, and Mrs. Snoozy reportedly are in a state of collapse. Her funeral has been scheduled Friday at 11 a.m. at the Place Funeral Home in Los Gatos. Burial will be at Oak Wood Cemetery in Santa Cruz. Funeral services for Kathy will be held tomorrow (Thursday) at 2 p.m. at the Oak Hill Memorial Park Mortuary in San Jose. Burial will be at Oak Hill Memorial Park". It should therefore come as no surprise that the Zodiac Killer would mail a postcard on July 13th 1971 with newspaper cuttings reading "Near Monticello Shought Victims 21 ...... In The Woods Dies April". Kathy Bilek was murdered on April 11th 1971, in the Villa Montalvo woods in Saratoga, near the neighborhood of Monticello. Just nine miles east of the Villa Montalvo woods in Saratoga, sits the neighborhood of Monticello in San Jose. The neighborhood of Monticello contains the Oak Hill Memorial Park & Cemetery where Kathie Snoozy is buried. The phonetic namesake of Kathy Bilek. The Zodiac Killer did like playing word games.    

THE HEADLINES THAT INSPIRED THE 340 AND 148 CHARACTER CIPHERS 

The Zodiac Killer appeared to be using Mount Diablo as a reference point as early as November 9th 1969, when he mailed the Bus Bomb letter and supplied us with some crosshairs and five X's on its circumference. Using this diagram it is possible to determine that the Zodiac Killer was identifying Mount Diablo as his initial or center point. Mount Diablo was used for the purpose of land boundaries in the majority of Northern California and Nevada, with the summit used as the "initial point", the north/south meridian and the east/west baseline intersection point. However, because of the vastness of California, surveying required three "initial points" of Mount Diablo, Mount Pierce and the San Bernardino Mountain to form grid lines. The Zodiac Killer knew the prominence of Mount Diablo from an elevation standpoint, but very likely knew some of the history from a navigational perspective  - and why he chose this mountain as his "initial point".

In the Dripping Pen card the Zodiac Killer was claiming the brutal stabbings of Kathie Reyne Snoozy & Debra Gaye Furlong on August 3rd 1969. On November 12th 1969, somebody featured in the San Francisco Chronicle used the San Jose double murder in their analysis of the Bus Bomb letter crosshairs, very likely concluding the "initial point" was Mount Diablo, without actually referring to the mountain by name. When you look at the five X's around the circumference, it's fairly obvious that they all sit on the left side of the crosshairs center (from 180 degrees to 330 degrees). They were positioned at 6, 8, 9, 10 and 11 on a clock face. Therefore, the "initial point" must be to the east of all the confirmed attack sites. When we attempt to line up the uppermost X with the Zodiac Killer's uppermost crime at Lake Berryessa, it becomes quickly apparent that only one position satisfies four of the X's on the circumference, and that one X represents both Lake Herman Road and Blue Rock Springs. If we draw a line through the Lake Herman Road and Blue Rock Springs attack sites, the line passes directly over the summit of Mount Diablo and beyond. By moving the crosshairs "initial point" along this line, we can see that only one position satisfies at least four of the X's.     

The Zodiac Killer only gave us a rough drawing of his crosshairs, so any interpretation must take this into account. The above diagram, centered over Mount Diablo, lines up the five locations the Zodiac Killer was claiming as his murders (Lake Herman Road, Blue Rock Springs, Lake Berryessa, San Francisco and San Jose). The (unaccounted for) red line above, travels directly over the Salesian High School of Daniel Williams, who Zodiac targeted from October 23rd 1969 to November 5th 1969 by prowling his house, poisoning his drink, making malicious phone calls, and threatening to shoot him via the Martinez Police Department. His subtle threats continued in the Dripping Pen card and Bus Bomb letter, explained thoroughly in the article The Quest For Number Eight. This is why he wrote "PS. Be Shure to print the part I marked out on page 3 or I shall do my thing" next to the crosshairs on the Bus Bomb letter. That "thing" was a threatened attack on Salesian High School, depicted by the red line on the map. The orange line shows Magnetic North of 16.5 to 17.0 degrees in 1969. The tilted crosshairs are slightly shy of this mark. But remember, the Zodiac Killer only drew us a rough guide in his correspondence. These Bus Bomb crosshairs were the precursor to the Mount Diablo map on June 26th 1970, when the Zodiac Killer again used the mountain's "initial point" as a directional tool, but this time to locate a proposed bus bomb on the Southern Freeway by Ingleside Police Station, using four radians and five inches. The Mount Diablo Map and Code Solution.     

The Zodiac Killer's 38 character code may be solved by examining three of his other ciphers (two solved and one unsolved), including the day he mailed the first Fairfield letter in December. The Z340 (November 8th 1969), Z38 (December 7th 1969), Z13 (April 20th 1970) and Z148 (probably May 3rd 1971) all have one other date in common - October 22nd 1969.

[1] The Z340 (November 8th 1969) was a response to the October 22nd 1969 Jim Dunbar Show, stating that the person who phoned into the show was effectively an imposter or phony, encoding a contemporary message and using wording similar to the headlines in the San Francisco Chronicle on October 24th 1969. The 340 message read, in part "That wasn't me on the TV Show", mimicking the headlines of "That Wasn't Zodiac, Say 3 Who Know" and "It Wasn't Zodiac, Say 3 Who Know". He also responded to the Jim Dunbar Show and the October 23rd 1969 Chronicle article, entitled "A TV Runaround With Zodiac Calls", in which "Belli told Sam he'd attempt to get a promise from District Attorney John J. Ferdon that Zodiac would be spared the gas chamber if convicted of murder". The Zodiac Killer responded in code that he was "not afraid of the gas chamber".​ 

​[2] The Z148 code (probably mailed May 3rd 1971) was again contemporary in nature, and a response to the police arrest and interview of Karl Francis Werner on April 29th 1971. Three newspaper articles ran with the headlines "San Jose Student Held in Slaying of Three Girls", "San Jose Student Held in Slaying of 3 Girls" and "Youth Arraigned in Knife Slayings of Three Girls". The Zodiac Killer encoded these headlines in his 148 character cipher by promising to "skin three kids and make a suit from the skin" if his latest letter was not published. He also encoded the statement "stop listening to phonys" in the Z148, referring to both Karl Francis Werner (who was being interviewed for the Snoozy & Furlong murders on August 3rd 1969, to which the Zodiac Killer had already claimed as his victims) and Eric Weill (who phoned into the Jim Dunbar Show at least twice, claiming to be Zodiac}. The second phone call was reported in San Francisco Chronicle on February 6th 1970, entitled "Talk Show's 'Zodiac' Caller a Phony", with Inspector David Toschi pitching in: "Homicide detectives later listened to a tape recording of the conversation and concluded that Sam was a phony. It most certainly was not Zodiac, said Inspector David Toschi".  The headlines of the October 24th 1969 and February 6th 1970 Chronicle articles both placed within the encoded text of the Z340 and Z148.

[3] The Zodiac Killer mailed the Z13 on April 20th 1970, very likely a response to the October 22nd 1969 article in the San Francisco Examiner, entitled "Cipher Expert Dares Zodiac to Tell Name". It read "Dr Marsh told the Examiner today: The killer wouldn't dare, as he claimed in letters to the newspapers, to reveal his name in the cipher to established cryptogram experts. He knows, to quote Edgar Allen Poe, that any cipher created by man can be solved by man. Zodiac has not told the truth in his cipher messages to the Examiner, the Chronicle and the Vallejo Times-Herald. Zodiac has not done this, because to tell the complete truth in relation to his name-in cipher code-would lead to his capture. I invite Zodiac to send The American Cryptogram Association a cipher code, which will truly and honestly include his name". The Zodiac responded on April 20th 1970 by stating "This is the Zodiac speaking. By the way have you cracked the last cipher I sent you? My name is___ " The letters N, A, M and E could be found in the ciphertext of the code.

[4] The Z38 mailed on December 7th 1969 began with "This is the Zodiac speaking. I just need help", mimicking the caller (Eric Weill) to the Jim Dunbar Show on October 22nd 1969. It is clear that this cry for help was a disingenuous attempt at ridicule from a killer who either listened to the Jim Dunbar Show on October 22nd 1969, or read the subsequent newspaper articles. On October 22nd 1969, the Los Angeles Times reported that "Belli was put on the line, and the voice said "I want help". On October 23rd 1969, the Desert Sun newspaper claimed that Melvin Belli told the caller “All of San Francisco wants to help you. The hand is out, you can feel the hands out.” On the same day of December 7th 1969, we have a man mailing a letter to the San Francisco Chronicle mocking the call to the Jim Dunbar Show by stating "I just need help", followed a few hours later by a call to an Oklahoma radio station by a man doing an awfully good impression of the man who rang the Jim Dunbar Show on October 22nd 1969. This impressionist caller could possibly be the Zodiac Killer mocking the Jim Dunbar Show, just as he had done in the letter earlier that day.

​Therefore, we have the Z340 (November 8th 1969), Z38 (December 7th 1969), Z13 (April 20th 1970) and Z148 (probably May 3rd 1971), all relevant to the date of October 22nd 1969. Bearing in mind the Z38 carried the same four and five characters from the beginning and the end of the 340 cipher, along with the observations above, we could expect the Z38 message to be somehow related to these other ciphers. The message may very well lie in the newspaper inches from October 22nd 1969 to December 7th 1969 - and may be related to the Jim Dunbar TV Show yet again. 

Just a quick recap: ​The author of the 38 character code prominently featured two sections of the 340 cipher, that included the beginning 4 ciphertext characters of the 340 cipher, and the last 5 ciphertext characters of the 340 cipher. The only logical reason for the Zodiac Killer to have done this, would have been to give us a clue to the solving of the 340 cipher. When the code key is applied to the 340 cipher before any period 19 (diagonal shift), the first 4 plaintext characters of the 340 cipher spell IRON. The last 5 plaintext characters spell DEATH. As previously pointed out, a hoaxer would have had to be extremely lucky to keep the beginning and ending of the 340 cipher intact, to the tune of 4 & 5 characters (when creating the Z38), that just happened to create two English words in these notable positions. One would have expected a lazy hoaxer to replicate ciphertext characters 333 to 338 in the 340 cipher, because these characters were close to the spelling of "Zodiac". But the author of the December 7th 1969 letter refrained from doing this, choosing to separate these 6 ciphertext characters, so as to form the word DEATH at the end of the 38 character code. See here.

The red rectangle above (around the first three rows of the Z38 code) represents the first 18 rows of the Z340 cipher, These sections both begin with the letter H and end with the number 9 (or reversed P), The last line in the red rectangle contains five characters, all of which can be found on the last line of the 340 cipher (that is solved only using the period 19 diagonal shift). If you apply the period 19 shift to the red rectangle of the Z38, you get H+, mirroring the first two characters seen when you apply the period 19 shift to the 340 ciphertext.  The blue rectangle (around the last two rows of the Z38 code) represents the last two rows of the Z340 (solved absent of the period 19 diagonal shift). The final five characters in the blue rectangle spell DEATH when using the 340 code key. The author of the December 7th 1969 letter (containing the Z38 code) also predated the appeal to Melvin Belli by stating "I just need help". The Zodiac Killer could not have copied the December 7th letter because it was unpublished by the time the Melvin Belli letter was mailed on December 20th 1969. It is such a shame that the majority of the Zodiac community dismiss this communication (and its sister communication on December 16th 1969) based on their extensive research of "it doesn't look like a Zodiac letter". A great opportunity to reveal another Zodiac message is sadly being ignored.  

On December 3rd 2020 David Oranchak, Sam Blake and Jarl Van Eycke unlocked the mystery to the 51-year-old 340 cipher, mailed by the Zodiac Killer on November 8th 1969. On December 7th 1969, the Zodiac Killer mailed a communication from Fairfield containing a 38 character code, yet to be broken. In recent years I have had little doubt that this letter was genuine Zodiac material, but the solving of the 340 cipher put to rest any lingering doubt regarding its authenticity.

​The author of the 38 character code prominently featured two sections of the 340 cipher, that included the beginning 4 ciphertext characters of the 340 cipher, and the last 5 ciphertext characters of the 340 cipher. The only logical reason for the Zodiac Killer to have done this, would have been to give us a clue to the solving of the 340 cipher. When the code key is applied to the 340 cipher before any period 19 (diagonal shift), the first 4 plaintext characters of the 340 cipher spell IRON. The last 5 plaintext characters spell DEATH. As previously pointed out, a hoaxer would have had to be extremely lucky to keep the beginning and ending of the 340 cipher intact, to the tune of 4 & 5 characters (when creating the Z38), that just happened to create two English words in these notable positions. One would have expected a lazy hoaxer to replicate ciphertext characters 333 to 338 in the 340 cipher, because these characters were close to the spelling of "Zodiac". But the author of the December 7th 1969 letter refrained from doing this, choosing to separate these 6 ciphertext characters, so as to form the word DEATH at the end of the 38 character code. 

After the solving of the 408 and 340 cryptograms in 1969 and 2020, there is a strong argument to be had, that the Zodiac Killer's remaining unbroken codes also contain a message, which includes the Z38 mailed just one month after the 340 cipher. I have attempted to tackle the Z38 code, but it needs an expert in code breaking to take a look at this encipherment, such as Dave Oranchak, who I believe could shed more light on this small code. The message beneath - at the very least - should provide a little more insight into the thinking of the Zodiac Killer during this crucial period. 

Did the Zodiac Killer create the 38 character code so soon after his November 8th 1969 offering as a prompt to the solution of the 340 cipher? I hope Dave Oranchak will take a look and possibly correct some of the incorrect assumptions I may have made. Thanks to Druzer, a regular contributor to both main Zodiac forums, for his assistance in this matter.
CLICK HERE FOR UNOBSTRUCTED VIEW OF CODE.

On December 3rd 2020 David Oranchak, Sam Blake and Jarl Van Eycke unlocked the mystery to the 51-year-old 340 cipher, mailed by the Zodiac Killer on November 8th 1969.  The decoded message was a response to the Jim Dunbar Show in which an imposter/fraud called in to the TV show pretending to be the infamous Zodiac Killer.on October 22rd 1969. It may have also been a response to the San Francisco Chronicle article on October 23rd 1969 entitled A TV Runaround With Zodiac Calls in which "Belli told Sam he'd attempt to get a promise from District Attorney John J. Ferdon that Zodiac would be spared the gas chamber if convicted of murder". The Zodiac Killer responded in code that he was "not afraid of the gas chamber". 

The following day, the San Francisco Chronicle published another article which featured the opinions of Nancy Slover, David Slaight and Bryan Hartnell, who were the only three people credited with hearing the Zodiac's voice to date. The headline of that column read That Wasn't Zodiac, Say 3 Who Know, to which the Zodiac Killer would reply in his message in the 340 cipher by confirming "That wasn't me on the TV show". He took the newspaper headline and incorporated it into his hidden message. The Zodiac Killer was effectively rejecting the notion that the person who appeared on the Jim Dunbar Show claiming to be him was the genuine article - the caller was a fraud or imposter.

The decoded 340 ciphertext read: I HOPE YOU ARE HAVING LOTS OF FUN IN TRYING TO CATCH ME - THAT WASN’T ME ON THE TV SHOW - WHICH BRINGS UP A POINT ABOUT ME - I AM NOT AFRAID OF THE GAS CHAMBER BECAUSE IT WILL SEND ME TO PARADICE ALL THE SOONER BECAUSE I NOW HAVE ENOUGH SLAVES TO WORK FOR ME WHERE EVERYONE ELSE HAS NOTHING WHEN THEY REACH PARADICE - SO THEY ARE AFRAID OF DEATH - I AM NOT AFRAID BECAUSE I KNOW THAT MY NEW LIFE IS LIFE WILL BE AN EASY ONE IN PARADICE DEATH.

However, it didn't stop there. On February 5th 1970, the Desert Sun newspaper reported that "a man claiming to be the Zodiac killer of five persons held another on-the-air conversation today with television personality Jim Dunbar. Two police inspectors closeted themselves with Dunbar at station KGOTV immediately after the one-sided conversation, which consisted mainly of Dunbar asking questions and repealing fragments of answers". This second call was also reported in the San Francisco Chronicle on February 6th 1970, again highlighting the belief of investigators that this person was another fraud impersonating the Zodiac Killer. Just over a year later the Zodiac Killer mailed a 148 character cryptogram and letter, again encoding a contemporary message, but this time calling out Karl Francis Werner as a phony. Karl Francis Werner had just been arrested in connection with the murders of Kathie Reyne Snoozy, Debra Gaye Furlong and Kathy Bilek, two of which he had long claimed he murdered since the mailing of his November 8th 1969 Dripping Pen card and 340 cryptogram. He would also soon claim Kathy Bilek as a murder victim in the July 13th 1971 Monticello card. The Zodiac Killer was clearly upset somebody else had been arrested for the two San Jose murders on August 3rd 1969 and was responding to a San Francisco Chronicle article on April 30th 1971 entitled San Jose Student Held in Slaying of Three Girls. The newspaper article read "He was immediately advised of his rights concerning any statements he may make and legal representation to which he is entitled, the detectives said. Werner was then taken to the scenes of the crimes. Late yesterday he was undergoing questioning. The detectives would not reveal what statements, if any, he had made concerning the killings of the three girls". His response was immediate, likely firing off the following communication in early May. 

The Zodiac Killer was responding to the Paul Avery newspaper article on April 30th 1971 describing the arrest and interview of Karl Francis Werner by law enforcement, imploring investigators to "stop listening to phonys". Just like the 340 cipher, in which the Zodiac Killer used the newspaper headline banner of That Wasn't Zodiac, Say 3 Who Know to create "That wasn't me on the TV show", he would again use a newspaper headline banner in his rebuttal of Karl Francis Werner as the killer of the three girls (in particular, Snoozy & Furlong).

An imposter/fraud had called into the Jim Dunbar TV Show on October 22nd 1969, followed by a second call to the show on February 5th 1970. The San Francisco Chronicle article on the left was entitled Talk Show's Zodiac Caller Called a Phony. The article read "Homicide detectives later listened to a tape recording of the conversation and concluded that Sam was a phony. It most certainly was not Zodiac, said Inspector David Toschi".  Fast forward to May of 1971, in which Karl Francis Werner is being interviewed by investigators for three murders, including the brutal stabbings of Kathie Reyne Snoozy and Debra Gaye Furlong, to which Zodiac had previously claimed by the addition of "Aug" on his November 8th 1969 Dripping Pen card. Perceived by him, the Zodiac Killer has now had the indignity of two phone calls to the Jim Dunbar Show, where a phony has effectively claimed his crimes, followed by the arrest and interview of Karl Francis Werner in 1971, possibly being credited with crimes he had previously claimed. His response to law enforcement was "stop listening to phonys", again using a newspaper headline incorporated into the ciphertext message of his cryptogram.

At the time the Zodiac Killer mailed the 148 character cipher in 1971, the 340 cryptogram was unsolved. Yet here we have two lengthy cryptograms, both of which are incorporating in contemporary form the rejection of an imposter or phony by using the phrases "That wasn't me on the TV show" and "stop listening to phonys" - and both cryptograms incorporated the language used in two newspaper headlines.

The 340 and 148 character cryptograms are inextricably linked through a message that is contemporary in nature, both are the rejection of two people connected to his crimes (and claimed crime), and both the Dripping Pen card and 148 character cipher are indelibly linked to the murders of Kathy Reyne Snoozy and Debra Gaye Furlong who were horribly killed and mutilated on August 3rd 1969 in San Jose. The Zodiac Killer would finish his written message in May 1971 with the wording of "I will send a patch of human skin if their is some left over". This was a threat to kill another three kids, just like Snoozy, Furlong and Bilek. The nature of these three brutal stabbings (in excess of 300 knife wounds) should leave you in no doubt the meaning behind the sinister message of "I will send a patch of human skin if their is some left over".

On December 3rd 2020, Dave Oranchak (USA), Sam Blake (Australia) and Jarl Van Eycke (Belgium) finally unearthed the solution to the 340 cipher after 51 years. The message read:

I HOPE YOU ARE HAVING LOTS OF FUN IN TRYING TO CATCH ME - THAT WASN’T ME ON THE TV SHOW - WHICH BRINGS UP A POINT ABOUT ME - I AM NOT AFRAID OF THE GAS CHAMBER BECAUSE IT WILL SEND ME TO PARADICE ALL THE SOONER BECAUSE I NOW HAVE ENOUGH SLAVES TO WORK FOR ME WHERE EVERYONE ELSE HAS NOTHING WHEN THEY REACH PARADICE - SO THEY ARE AFRAID OF DEATH - I AM NOT AFRAID BECAUSE I KNOW THAT MY NEW LIFE IS LIFE WILL BE AN EASY ONE IN PARADICE DEATH.
Here is what the Zodiac Killer could have written regarding the phone call to the Jim Dunbar Show:
I HOPE YOU ARE HAVING LOTS OF FUN IN TRYING TO CATCH ME - STOP LISTENING TO PHONYS - WHICH BRINGS UP A POINT ABOUT ME - I AM NOT AFRAID OF THE GAS CHAMBER BECAUSE IT WILL SEND ME TO PARADICE ALL THE SOONER BECAUSE I NOW HAVE ENOUGH SLAVES TO WORK FOR ME WHERE EVERYONE ELSE HAS NOTHING WHEN THEY REACH PARADICE - SO THEY ARE AFRAID OF DEATH - I AM NOT AFRAID BECAUSE I KNOW THAT MY NEW LIFE IS LIFE WILL BE AN EASY ONE IN PARADICE DEATH. 

One of the most remarkable achievements in the Zodiac story occurred in 2020, when David Oranchak, Sam Blake and Jarl Van Eycke collaborated to finally break the 51 year resistance of the infamous 340 cipher on December 3rd. But what inspired the added complexity and the diagonal shift employed by the Zodiac Killer in his encryption technique on November 8th 1969. The trigger may have been his 408 cipher and the detailed attempt to break it in the Vallejo News Chronicle on August 4th 1969, at a time when the Zodiac Killer would undoubtedly have been scrutinizing the newspapers for progress on his 408 cipher. This was pointed out to me by the forum contributor known as Cragle, who made this astute observation recently.     

The cryptogram fan from San Francisco, a graduate student, made some observations regarding the 408 cipher (shown on the left). While his analysis wasn't wholly accurate, it is this newspaper article that may have bearings on the technique employed by the Zodiac Killer when designing his 340 cipher. On page two of this newspaper article it continued The pattern beginning to take shape apparently will end up a three-tiered diagonal structure composed of sections, of each of the three ciphers. Work with the patterns of the ciphers, which he calls complex and the work of a very intelligent person, has yielded eight doublets of symbols which are equals. He remarked that he didn't feel the ciphers were a hoax because they are too complicated and required too much effort to devise. "A computer may have been used" he said. He thinks the person who made them is intelligent, scheming and imaginative, but not really unusual. "I know kids in school who could do better" on cryptograms. 

The next communication mailed by the Zodiac Killer on October 13th 1969 promised to target young children, threatening that "School children make nice targets, I think I shall wipe out a school bus some morning. Just shoot out the front tire + then pick off the kiddies as they come bouncing out". But the most important section in the Vallejo News Chronicle article was "The pattern beginning to take shape apparently will end up a three-tiered diagonal structure composed of sections". The Zodiac Killer's 340 cipher, that followed the October 13th 1969 letter, was three-tiered just like the 408 cipher, but crucially it was structured diagonally for the majority of the coding, as postulated in the newspaper. The title of the newspaper article was Text Of Letter May Offer Clues, but did it offer the inspiration for the Zodiac Killer to create a diagonal shift in his 340 cipher just three months later?