ZODIAC CIPHERS
Richard Grinell, Coventry, England
  • Home
    • Search This Site With Google
    • My Interview on the Zodiac Killer Channel
    • The Mount Diablo Map and Code Solution
  • Zodiac News
    • Zodiac News Archives
    • Santa Barbara Attack
    • Cheri Jo Bates
    • The Confession
    • Riverside Desktop Poem
    • Bates Letter
    • The Forgotten Victims
    • Zodiac RSS Feed
    • Welsh Chappie - Zodiac News
  • Lake Herman Murders
    • Blue Rock Springs Attack
    • Vallejo Times Letter
    • Examiner Letter
    • Chronicle Letter
    • Complete 408 Cipher
    • Vallejo and Benicia Map
    • Kathie Snoozy and Debra Furlong Murders
    • Debut of Zodiac Letter
  • Lake Berryessa Attack
    • Presidio Heights Attack
    • Call to Chat Show
  • 340 Cipher
    • Bus Bomb Letter
    • Betsy Aardsma Murder
    • The Fairfield Letter
    • Melvin Belli Letter
    • Santa Barbara Murders 1970
    • Modesto Attack
    • My Name is Cipher
    • Dragon Card and Button Letter >
      • Phillips Road Map
    • The Sleeping Bag Murders
    • The Little List Letter
  • The Halloween Card
    • Lake Tahoe Disappearance
    • Los Angeles Times Letter
    • The Monticello Card
    • The Exorcist Letter
  • SLA Letter
    • Red Phantom Letter/American Greetings Card
    • The 1978 Letter
    • Zodiac Letters Real or Fake
    • Zodiac Documentary
    • Zodiac Killer Net Forum - Hot Topics
    • Unsolved Mysteries
    • The Colonial Parkway Murders
  • Suspects
    • Arthur Leigh Allen
    • Rick Marshall
    • Lawrence Kane
    • Theodore Kaczynski
    • Richard Gaikowski
    • Gareth Penn
    • Jack Tarrance

THE ANSWER TO THE MOUNT DIABLO CODE

6/7/2020

 
Picture
The problem with solving the Zodiac Killer's 32 Symbol cipher and Phillips 66 Map code, is a failure to follow the instructions given by the killer in the June 26th 1970 letter and its follow up on July 26th 1970. The Zodiac Killer stated "The map coupled with this code will tell you where the bomb is set.  You have untill next Fall to dig it up". This tells us that the solution to the 32 symbol cipher will not supply us with the exact position of the supposed bomb. Any solution to this 32 character code pinpointing the exact position of the bomb will be incorrect, because this can only be realized by coupling it with the map. Therefore, the position of the bomb to be set, was a combination of both code and map.

In his following letter he stated "P.S. The Mt. Diablo code concerns Radians + # inches along the radians". This tells you that the code is about radians and inches but not necessarily the entire solution. Any solution to the position of the bomb that doesn't use radians and inches (as implicitly stated by the killer) will be wrong. The phrase "P.S. The Mt. Diablo code concerns Radians + # inches along the radians" would supply the inches value, hence the hashtag before inches, along with the arrow beneath, instructing us to insert a value here. This isn't rocket science - the hashtag is widely recognized as a number sign, so by placing this immediately before the word "inches", the Zodiac Killer is telling us to insert a number before inches. The only way to find a bomb in Northern California using his instructions, is to travel a set amount of radians around his crosshairs, and then subtend a set amount of inches from it. In this case, a number of radians around Mount Diablo and a number of inches from it. Placing a hashtag and arrow before the word "inches", is rather a giveaway that a number value should precede it. Even the map code was 6.4 miles to the inch. Any solution that gives us the answer in degrees or miles is wrong, because "The Mt. Diablo code concerns Radians + # inches along the radians". We need to follow his instructions. This is why any theory of crime scene locations being chosen because they are separated by a radian or near radian value, is wrong also. The whole premise of the June 26th 1970 letter was to discover the location of his bomb, not measure angles between crime scenes or any other object we choose to construct or imagine

The Zodiac Killer gave us crosshairs superimposed over Mount Diablo with an arrow pointer set in the north facing position, "to be set to Mag. N". He allocated it a zero position, with a 3, 6 and 9 in the form of a clock face around its circumference. This was to instruct us to travel clockwise around the circumference of the crosshairs, to be set at 17 degrees (which was the magnetic north value in 1970). We had to travel a set amount of radians around his crosshairs over Mount Diablo, in addition to this value of 17 degrees. So, we are looking for a set amount of inches and a set amount of radians. The Zodiac Killer was incapable of keeping secrets and resisting putting pen to paper, so just one month later he gave us the answer, when the July 26th 1970 letter arrived at the San Francisco Chronicle.          

Picture
Never done before or since by the Zodiac Killer, he drew a big fat zero around the circumference of his crosshairs with SFPD alongside it. This represented the San Francisco Police Department. This bold, black circle sat at 246.2 degrees, which is 4 radians and magnetic north. This was the radian component of "The Mt. Diablo code concerns Radians + # inches along the radians". The answer was 4 radians. All we had to do now was find the "inches" value.

The Zodiac Killer mailed virtually every correspondence to the San Francisco Chronicle, describing the makeup of his bomb on November 9th 1969. He followed this up with a diagram of a school bus and photoelectric cells on April 20th 1970, referencing
the murder of San Francisco police officer Brian McDonnell on February 16th 1970, who suffered devastating and sadly fatal injuries two months earlier, when a bomb packed with fence staples exploded on an outside ledge of Park Police Station in the Upper Haight neighborhood of San Francisco. The Zodiac wrote about the "blast" he was going to have when he mailed the Dragon card on April 28th 1970. All of these communications directed towards the San Francisco Chronicle indicating he was constructing a bomb, with the SFPD attribution totaling zero adorning many. Therefore, it's pretty obvious that placing SFPD around the circumference of his crosshairs, next to a big fat zero and set to a value of 4 radians and magnetic north (4 X 57.3 + 17), indicates that the target for the bomb is San Francisco - or more specifically - the San Francisco Police Department. When the above crosshairs are set over Mount Diablo, we now have to travel 4 radians and magnetic north from the peak of the mountain. Let us now find the inches value to be inserted into "Radians and # inches along the radians".

We actually don't have to look hard to find the answer. The land mass and geography of San Francisco is such, that only 5 inches can fall over it. Using the map scale of 6.4 miles to the inch, anything less than 5 inches, and anything more than 5 inches, doesn't fall inside San Francisco. Therefore, there is only one answer. The same applies to the radians value. Anything more or less than 4 radians and magnetic north (such as 5 radians and magnetic north, or 3 radians and magnetic north), doesn't fall inside the geography of San Francisco. A bomb threat on San Francisco (hence SFPD=0), can only be 4 radians and magnetic north, and 5 inches along that radian value. The choice of words by the Zodiac Killer when he wrote "Radians and # inches along the radians". were chosen carefully. We were instructed to find "radians", and an amount of "inches" along the amount of "radians" we found. Once we found the radians value, we would travel 5 inches along that radian.
The answer to the map was the magnetic north value of 17 degrees, to be coupled with four radians and five inches of the code. The two "coupled" together gave us the full answer. Druzer, an avid Zodiac researcher, came up with a solution to the 32 character code which I believe is correct, when he suggested Estimate: four radians and five inches. This solution not only satisfies the 32 characters, but correlates three plaintext letters to the only three repeating ciphertext characters in the code, thereby providing a perfectly valid key. See The Blast Estimate of Zodiac, The Blast Estimate of Zodiac (Part Two). and The Blast Estimate of Zodiac (Part Three).

Picture
Picture
The map scale is 6.4 miles to the inch. This gives us a distance of 6.4 multiplied by 5 (inches). Therefore, the bomb was to be set at 4 radians and magnetic north, and 32 miles from the peak of Mount Diablo. The only San Francisco Police Department that comes anywhere close is Ingleside Police Station. This San Francisco Police Department sits at 30.96 miles from the peak of Mount Diablo (4.84 inches). It also sits at 251 degrees from the peak of Mount Diablo (4.08 radians).

The Zodiac Killer gave us a rough guide of 4 radians and magnetic north, and 5 inches (hence the word "estimate"). If he had given us the exact measurement, it would have been 4.08 radians and 4.84 inches, He was clearly giving us an approximate measurement. Since Ingleside Police Station was the only San Francisco Police Department anywhere close to these measurements, it's fairly obvious this was his target. The Zodiac Killer's distance in miles was 96.8% accurate. His angular accuracy in degrees was 98.0%. The Zodiac Killer was very unlikely to have selected a specific target that fell on an exact whole number of radians and inches.   

Picture
Picture
The Zodiac Killer was targeting Ingleside Police Station for his bomb, but clearly he wasn't going to start digging a hole on the lawn of Ingleside Police Station. The Zodiac Killer also threatened to blow up a school bus on April 20th 1970, in which he drew us a diagram with a steep embankment on the right, with the sun rising to the east. This would suggest we should be looking for a bus route traveling from north to south (where the sun rises to the east in the morning), with a steep embankment to the right of the bus, where the Zodiac Killer can lay his photoelectric cells and conceal his bomb. He also has to access that roadway from a position of anonymity, with his vehicle parked at the top of the embankment in relative seclusion. What are the odds of that location being the exact closest portion of road to Ingleside Police Station, meeting all the criteria above. This would satisfy the drawing on the April 20th 1970 letter and the target of SFPD (Ingleside Police Station). The Zodiac Killer could metaphorically kill two birds with one stone.

So let us travel just 274 feet from Ingleside Police Station to the nearest section of road heading north to south.

Picture
Again, what are the chances that the area highlighted by the red rectangle would mimic exactly his bomb diagram of a school bus and embankment, as drawn in the April 20th 1970 letter. Not only that, but this would have been a school bus route in 1970. Children from the northern and eastern areas of San Francisco would use the school bus to reach St Thomas More Catholic School at 50 Thomas More Way. There is even a bus route road sign 38 feet from the proposed location of the bomb (whether it existed in 1970 I don't know). So, let us drop down to the exact position of the red rectangle and take a closer look.
Picture
All the Zodiac Killer had to do to access the embankment, was to access the parking lot of the City College of San Francisco and drive to its eastern edge - and at night - in relative anonymity to the police station, dig the bomb into the embankment. It is highly unlikely that the Zodiac Killer ever intended to plant a bomb, but this location fits all the criteria of targeting both a San Francisco Police Department and a school bus at the same time. It achieves his objective of targeting school children for maximum terror, and achieves his objective of "rubbing the pigs nozes in their booboos". The location of the bomb not only matches the diagram from April 20th 1970, but satisfies the criteria of the Mount Diablo map and code to an overall accuracy of 97.5%. The 32 character cipher is also answered. The Zodiac Killer likely had no intention of laying this bomb, but it was the threat that mattered most of all. The Zodiac Killer knew that the clues he provided us with on June 26th 1970 were inadequate in cracking the bomb location and code, so he gave us these additional clues in the Little List letter on July 26th 1970, one month later.

# Radian values are normally measured in a counter-clockwise direction, but the positioning of the bold, black circle at 246 degrees (4 radians and magnetic north), along with the north facing arrow pointer, the addition of the clock face set at zero, and the instructions to "set to Mag. N.", appears to indicate the Zodiac Killer measured his radians from the north position clockwise. In effect, he was multiplying the radian value of 57.3 by a factor of 4, set to magnetic north of 17 degrees (246.2).   
Picture
It has been stated on this site and elsewhere, that the 32 character code is unsolvable using conventional cipher techniques without the killer supplying us with a key. There are 29 unique characters within the code, making any solution practically unprovable. The solutions offered by using the 408 and 340 keys have produced less than convincing results, particularly when we consider that this code contains an "anchor" and "omega" symbol, not used in the 408 and 340 ciphers. Attempting to correlate the letters used in the code to written text in both the Button letter (June 26th 1970) and Little List letter (July 26th 1970) also produces negative results. Therefore, it could be argued, that a code containing 29 unique characters must have an alternative meaning, in accompaniment to the code solution of "estimate:four radians and five inches". Here is one possibility. 

The Zodiac Killer gave us an estimate of 4 radians, but the exact figure is 4.084 radians. That is, 4.084 multiplied by one radian value (57.3 degrees) to equal 234 degrees. When we add in the magnetic north which Zodiac instructed us to do (17 degrees in 1970), we get 251 degrees and the precise location of the Southern Freeway embankment and Ingleside Police Station. Could the 32 character code contain the value of 234 degrees, which once set to magnetic north, now identified the exact location of Ingleside Police Station? If we resort to basic numerology where A=1, B=2, C=3 etc, and add up the values of the forward facing alphabetical characters in the Zodiac Killer's 32 character code, we arrive at a total of 234 (or 234 degrees). When set to magnetic north, it gives us the value of 251 degrees, which when subtended from the peak of Mount Diablo passes directly over Ingleside Police Station and the Southern Freeway. 

​    "The map (set to 17 degrees magnetic north) coupled with the code of 234 will tell you where the bomb is set".
Picture
Picture

NOT F - - KING CRACKPROOF

6/1/2020

 
Picture
Without any additional information the April 20th 1970 code is unsolvable. The Zodiac Killer was many things, but he wasn't a  half-witted imbecile with the brain of a gibbering lunatic when he designed this short 13 character code. In a newspaper article authored by Will Stevens on October 22nd 1969 in the San Francisco Examiner, Dr. D.C.B. Marsh challenged the Zodiac Killer no less than four times to supply us with his name in a cipher. Dr. Marsh stated in one section "The killer wouldn't dare...as he claimed in letters to the newspapers...to reveal his name in a cipher to established cryptogram experts". He added: "I invite Zodiac to send The American Cryptogram Association, care of Dr. D.C.B. Marsh, a cipher code - however complicated - which will truly and honestly include his name", quoting Edgar Allan Poe "that any cipher devised by man can be solved by man". Therefore, it was no great surprise when Zodiac's April 20th 1970 letter landed on the desk of the San Francisco Chronicle with the contemptuous opening line of "By the way have you cracked the last cipher I sent you? My name is------".  He knew his last cipher had not been solved, yet in mocking fashion was replying to the claim "that any cipher devised by man can be solved by man". The phrase "by the way" is used to introduce a new subject to be considered or to give further information. The Zodiac was effectively saying to Dr. Marsh he was wrong, now try this new cipher for size.
Picture
The Zodiac Killer chose to include eight characters from the English alphabet in his cipher, with 26 to choose from. Bearing in mind the challenge by Dr. Marsh was for Zodiac to reveal his name in the cipher, what are the odds of "NAM" forming consecutively, along with seven of the eight letters chosen from the alphabet being present in the word "name", being unintentional? Thereby leaving only K surplus to requirements. Although not impossible that this was just coincidental, one could argue that the N, A, M and E were chosen deliberately, considering the challenge by Dr. Marsh and the mocking introduction to the cipher by the Zodiac Killer. Did the Bay Area murderer, responding to the proposition of the eminent cryptographic expert to supply his "true identity" and "name", include his "identity" on line 20 of the 340 cipher, and use the word "name" in the Z13 just five months later?

Was the Zodiac Killer was just playing games with The American Cryptogram Association, determined not to have a further two ciphers cracked in a matter of days? - and thereby avoiding the acute embarrassment of creating "a cipher designed by man that can be solved by man". After the challenge on October 22nd 1969, the Zodiac Killer was going to design the remaining ciphers on his terms, to which he would ultimately reveal the answers. He wasn't going to allow Dr. Marsh the satisfaction of using cryptographic techniques to pry open his ciphers, so used the wording of Dr. Marsh "to send a cipher code, however complicated" against him, by sending two of the most infantile ciphers possible.

If we strike out the seven letters that have now formed "NAME" we are left with "NAME K". If this was the beginning letter of his surname, then the first circled 8 could represent his forename. So, if we are looking for an expanded declaration of his name using both forename and surname in later communications, we would be looking for a two letter combination, ending in K. But in addition, this would have to be accompanied by some pertinent text alongside the two letter declaration. This occurs in only one subsequent communication of the Zodiac Killer.   
Picture
You will notice how he begins this section of text, with "There are reports city police pig cops are closeing in on me". The text refers to the notion that law enforcement could possibly be close to capturing him, with the last word of "me" followed by a comma. One would therefore expect the next line to be a reaction by him in relation to this news. This has long been thought to be the abbreviated word "fuck" - an approach he didn't take in the August 4th 1969 Debut of Zodiac letter, when he wrote "When I hung the phone up, the damn X@ thing began to ring & that drew his attention to me + my car". The two letters of Fk may very well have been his initials - and a declaration that he "Fk, was crackproof". It may also be the answer to the 13 Symbol cipher, when responding to the challenge of Dr. Marsh.

If "Fk, I'm crackproof" was the answer to the 13 Symbol cipher, then one would have expected the Zodiac Killer to have designed the cipher with some markers present, that the answer could be fitted around later. Especially if no cryptographic technique was required. The phrase of "Fk, I'm crackproof" was the perfect response to Dr. Marsh, in that Zodiac could satisfy the request of Dr. Marsh by giving us his name, albeit in the shortened format. He began the April 20th 1970 letter by stating
"By the way have you cracked the last cipher I sent you? My name is------". He responded immediately with his name (FK), before rubbing Dr. Marsh's "noze in his booboos" by declaring he was crackproof, having also just taunted the cryptographic expert with the mocking introduction of "have you cracked the last cipher I sent you?". The Zodiac Killer knew that Dr. Marsh would never solve his Z340 and Z13 ciphers when he designed them, because they couldn't be solved using standard cryptographic methods - and more importantly - the answers were 6 months in the making.

The circled eights (The number 8 in the Bible represents a new beginning) seemed to have extra significance compared to the other characters in the cipher. Because the Celtic Cross and Anchor have relevance in Christianity, it was considered that the number 8 was the beginning of each word. The three circled eights, along with the K and M inside them, were the markers I described earlier, so that his later solution would be understood. All we had to do now, was place the phrase "Fk I'm crackproof" into the 13 Symbol cipher, with each number 8 beginning each element of the phrase.
Picture
The completed introduction to the April 20th 1970 letter now read perfectly with respect to the Zodiac Killer giving us his name: "This is the Zodiac speaking. By the way have you cracked the last cipher I sent you? My name is Fk, I'm crackproof". And so did the phrase "There are reports city police pig cops are closeing in on me, Fk I'm crackproof". Placing his real name in the 13 Symbol cipher was never a realistic proposition - and even if this had been done - it would never have been revealed and could never be proven. The only way a solution to the 13 Symbol cipher could be proven beyond any doubt, was for the Zodiac Killer to give us the answer. He obliged on October 5th 1970, as he did for the Z32 on July 26th 1970 and the Z340 on October 27th 1970. Proving this is the answer to the Z13 in isolation, is nigh on impossible, but when all three ciphers can be answered in three consecutive communications using only the words of Zodiac, it exposes a killer unable to resist temptation. The Zodiac Killer simply didn't have the temperament to take his secrets to the grave. 
    Picture
    Picture
    Picture

    All
    13 Hole Postcard
    148 Character Cipher
    1978 Letter
    1986 Letter
    1987 Letter
    2001 Happy New Year Card
    Albany Letter
    Allan/Peyton Murders
    Arthur Leigh Allen
    Atlanta Letter
    Betsy Aardsma
    Blue Rock Springs Attack
    Bus Bomb Letter
    Button Letter
    Call To Chat Show
    Carol Beth Hilburn
    Channel 9 Letter
    Cheri Jo Bates
    Cipher Theories
    Citizen Card
    Concerned Citizen Card
    Confession Letter
    Daniel Williams Poisoning
    Debut Of Zodiac Letter
    Deep Real Estate Ad
    DMV Letter
    Domingos/Edwards Murders
    Donald Lee Bujok
    Donna Lass
    Dragon Card
    Earl Van Best Jr
    Eureka Card
    Exorcist Letter
    Fairfield Letter
    Fingerprint Evidence
    Forecast For Cancer
    Forecast For Leo
    Gareth Penn
    General News Articles
    Gilbert And Sullivan
    Good Citizen Letter
    Halloween Card
    Hood/Garcia Murders
    Internet Articles
    Joan Webster
    Judith Hakari
    Kevin Robert Brooks
    Lake Berryessa Attack
    Lake Herman Road Murders
    Lake Tahoe Disappearance
    Larry Kane
    Leona Roberts Murder
    Los Angeles Letter
    Melvin Belli Letter
    Mike Morford (Morf13)
    Modesto Attack
    Molina/Rodriguez Murders
    Monticello Card
    My Name Is Letter
    Nancy Bennallack
    New Canaan Letters
    Novato Letter
    Oakland A's Letter
    Pines Card
    Possible Zodiac Attacks
    Possible Zodiac Letters
    Presidio Heights Murder
    Radians
    Red Phantom Letter
    Richard Gaikowski
    Riverside Desktop Poem
    Robert Salem Murder
    Ross Sullivan
    Saechao/Saelee Murders
    San Jose Code Letter
    Santa Claus Card
    Scotch Tape Letter
    Sla Letter
    Tamalpais Valley Attack
    Ted Kaczynski
    Telegraph Avenue Incident
    The 340 Cipher
    The 408 Cipher
    The Celebrity Cypher
    The Little List
    The Mikado
    Thomas Horan
    You Are Next Letter
    Zodiac Letters Poll
    Zodiac Postage
    Zodiac Theories

    Picture

    RSS Feed

    Picture
    Picture
    Picture
    Picture
    The Zodiac Killer may have given us the answer almost word-for-word when he wrote PS. The Mt. Diablo Code concerns Radians & # inches along the radians. The code solution identified was Estimate: Four Radians and Five Inches To read more, click the image.
    Picture
    Picture
    The Zodiac Atlas: The Zodiac Killer Enigma by Randall Scott Clemons. Click image for details.
    Picture
    The Zodiac Killer Map: Part of the Zodiac Killer Enigma by Randall Scott Clemons. Click image for color version
    For black and white issue..
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture
    Picture

    Archives

    January 2023
    December 2022
    November 2022
    October 2022
    September 2022
    August 2022
    July 2022
    June 2022
    May 2022
    April 2022
    March 2022
    January 2022
    December 2021
    November 2021
    October 2021
    September 2021
    August 2021
    July 2021
    June 2021
    May 2021
    April 2021
    March 2021
    February 2021
    January 2021
    December 2020
    November 2020
    October 2020
    September 2020
    August 2020
    July 2020
    June 2020
    May 2020
    April 2020
    March 2020
    February 2020
    January 2020
    December 2019
    November 2019
    October 2019
    September 2019
    August 2019
    July 2019
    June 2019
    May 2019
    April 2019
    March 2019
    February 2019
    January 2019
    December 2018
    November 2018
    October 2018
    September 2018
    August 2018
    July 2018
    June 2018
    May 2018
    April 2018
    March 2018
    February 2018
    January 2018
    December 2017
    November 2017
    October 2017
    September 2017
    August 2017
    July 2017
    June 2017
    May 2017
    April 2017
    March 2017
    February 2017
    January 2017
    December 2016
    November 2016
    October 2016
    September 2016
    August 2016
    July 2016
    June 2016
    May 2016
    April 2016
    March 2016
    February 2016
    January 2016
    December 2015
    November 2015
    August 2015
    July 2015
    June 2015
    May 2015
    April 2015
    March 2015
    February 2015
    January 2015
    December 2014
    November 2014
    October 2014
    September 2014
    August 2014
    July 2014
    June 2014
    May 2014
    April 2014
    March 2014
    February 2014
    January 2014
    December 2013
    November 2013
    October 2013
    September 2013
    August 2013
    July 2013
    June 2013
    May 2013
    April 2013
    February 2013
    January 2013
    December 2012
    November 2012
    October 2012
    September 2012
    July 2012
    January 2012

Picture
Picture
Picture
Picture
Picture
Picture
Picture
Photos used under Creative Commons from Marcin Wichary, zAppledot, vyusseem, Alex Barth, Alan Cleaver, jocelynsart, Richard Perry, taberandrew, eschipul, MrJamesAckerley