ZODIAC CIPHERS
RICHARD GRINELL, COVENTRY, ENGLAND
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GIVING US A GUIDE TO THE 34O WORKINGS?

1/20/2026

 
Many people have described the author of the Fairfield letter (with code) as a lazy hoaxer who just dragged two sections of ciphertext from the 340 cipher and plonked them in the Z38 code below. Not only would this be a pointless task, but if this person wanted to make the reader believe they were the Zodiac Killer, why would they adopt the approach of an obvious impersonator and imitate previous correspondence? The more realistic answer to this communication is that it was the Zodiac Killer giving us a clue to the workings of the 340 cipher. Before David Oranchak, Sam Blake and Jarl Van Eycke cracked the 340 cipher in 2020, nobody was aware that the first 4 and last 5 characters of the 340 cipher spelled "IRON" and "DEATH" when the cipher key was applied to it, yet the author of the Z38 code just happened to feature these two sections of ciphertext in their December 7th 1969 letter. Probably the most obvious thing for an impersonator to do, was to bring forth the "near Zodiac"  (ZO∆AIK) from the final row of the 340 cipher and drop it into this code, but this person snubbed that opportunity and broke it up to what we see in the second red rectangle below. An obvious feature in the 340 cipher that the impersonator failed to impersonate. This segment of code is also noticeably larger than the rest of the ciphertext, including the row it sits on.

After the cipher key was applied to the original 340 ciphertext we got the incoherent plaintext shown below. However, after the period 19 shift was applied, the word "DEATH" remained one of only three forward facing words to stay intact (the others being "WILL" and "EASY"). But "DEATH" stands out because it isn't surrounded on both sides by other plaintext, sitting in a prominent position at the end of the cipher. 
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The ciphertext characters "H" and "+", not only begin and end the original 340 ciphertext, they begin and end the new ciphertext arrangement after the period 19 shift is applied to it. They also form the beginning two ciphertext characters on the first row of the new ciphertext arrangement. And begin and end the Z38 code mailed on December 7th 1969. If you apply a period 19 shift to the Z38 code above, you get the ciphertext characters "H" and "+" featuring for a fifth time. Because the cipher is 38 characters in length, if you continue the period 19 shift you will get a repeated "H+" sequence continuously. Sam Fisher, a Zodiac researcher, also pointed out that the plaintext letter "H" was represented by the ciphertext character "+" in the 148 character cipher mailed by the Zodiac Killer in May 1971.

Of course, this is all totally coincidental, created by a hoaxer who pleaded "I just need help" (not published in the newspapers) two weeks before the Melvin Belli letter arrived on December 20th 1969, stating "please help me". A December 7th 1969 letter mailed a matter of hours before somebody rang the Oklahoma City radio station KTOK, and made mockery of the Jim Dunbar TV show on October 22nd 1969, featuring attorney Melvin Belli. If we want to discover more about the Zodiac Killer, it's imperative we analyse every potential communication mailed in his name. The other option, adopted by many researchers, is to pay little heed to these communications and lazily believe what they have been fed by others in the Zodiac community, adopting an "Ignorance is bliss" type approach. Lazy individuals who believe in lazy hoaxers, who refuse to even consider that they may be wrong. 

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    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.
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