The thread on Zodiackiller.com also shows the decrypted text- the GYKE becoming AUSE. Using these two portions we are able to form GYKEAUSEKEY.
In the San Francisco Chronicle letter mailed on July 31st 1969 he tempted the observer with the lines "I want you to print this cipher on the front page of your paper. In this cipher is my idenity".
When cracked by Donald Gene and Bettye June Harden several days later, it revealed little in the way of unmasking the Northern California killer, but was the Zodiac a master of wordplay rather than a complete liar. After all, he did not say "once the cipher was cracked we would have his identity"- moreover, his identity was in the cipher, which GYKE certainly was.
His wordplay comes into effect in the follow up 'Debut of Zodiac' letter on August 4th 1969, where upon he taunts the police, by stating "By the way, are the police having a good time with the code? If not, tell them to cheer up; when they do crack it, they will have me". Again, this appears another empty promise, however it was not. On the 17th line of the 408 cipher (symbols
So, can we find a clue to Richard Gaikowski in the 340 cipher as well as the 408 cipher and bolster the argument, that indeed the Zodiac did leave clues to his identity in both of the main ciphers.
Tantalizingly we have the letters AIK on the 20th and final line of the 340, but the G is unfortunately nowhere in sight- so we will fetch it from the 408 instead. As we stated earlier GYKE is positioned on the 20th line of the 408 cipher (4 to 7 symbols into the line). We will take this and transfer it to exactly the same position on the 20th line of the 340 cipher (4 to 7 symbols into the line), and place it over the existing symbols, to form GYKES ZODIAC or GYKAUSEKEYS ZODIAC. SEE BELOW.
Additionally, it is now possible to form GAIK running from left to right. But does it hint towards the Zodiac Killer and Richard Gaikowski being one and the same person. Not really- it just shows what an amazing tool the art of wordplay can be, when one has a specific objective in mind.