
Unfortunately, nobody appeared to understand the simplicity of his message, so he added a second crucifix (or cross) just three weeks later, when he mailed the Halloween Card on October 27th 1970. Nobody at the time understood the secret message in the '13 Hole' Postcard, which is why he added the second layer just 22 days later. The Zodiac Killer did add a second tier of messages in the 340 cipher, to which he revealed in the following Halloween Card on October 27th 1970. The Zodiac Killer taking the shape of the "red crucifix decoder" as the template, to be coupled with the 13 punch-holes he added to the October 5th 1970 postcard All we had to do was arrange the 13 punch-holes in the shape of a crucifix, so when it was placed over the 340 cipher, a message was revealed.

#340 cipher cracked
It may very well have been this simplistic, with everybody expecting the Zodiac Killer to make his second cipher much harder, after his first cipher was cracked with relative ease. But my totally untrained cipher gut tells me that if the 340 can be solved it's might be something as seemingly simplistic as this". Even if you managed to hit on the right size and shape, the message could still be coded. The problem would be to determine a size and whether or not to round the shape or square it off. Seagull, a contributor to the Zodiac Killer Site forum, was on the right path when she stated "If I were to attempt to try something like this, to find a hidden message, I think I would start with using the shape of the crosshair symbol for the template. This was his very own Dick Tracy descoder. In the postcard the Zodiac Killer provided us with his "red crucifix decoder" and "13 punch-holes" in the fabric of the card. The '13 Hole' Postcard was mailed by the Zodiac Killer on October 5th 1970, just shy of the one year anniversary of the 340 cipher. Where have we seen a possible "Red Decoder" and "Punched out white holes" in one of Zodiac's communications before. Green questions requires a Green Decoder from other Sugar Crisp, Post Raisin Bran, or Sugar Rice Krinkles packages". Punch out white holes to decode answers to Red "Crimestopper" messages on the package. In the picture above, the writing states "This is your Red Decoder. I believe he may just have done exactly that.
#340 cipher code
I invite 'Zodiac' to send The American Cryptogram Association a cipher code-however complicated." Therefore, wouldn't it be just like the Zodiac Killer to send the newspapers the most uncomplicated cipher code he could find, based on a code found in children's cereal boxes.

"Zodiac" had not done this, Marsh suggested, because to tell the complete truth in relation to his name, in cipher code, would lead to his capture. In the San Francisco Examiner article, Dr Marsh stated "The killer wouldn't dare, as he claimed in letters to the newspapers, to reveal his name in a cipher to established cryptogram experts. Fast forward to October 22nd 1969, when Dr DCB Marsh, president of The American Cryptogram Association, laid down a challenge to Zodiac. The daily diet of codebreaking a fascination for many children growing up in mid twentieth century, post-war America. This was great for children, but likely a nightmare for parents, who were undoubtedly nagged into buying Post Sugar Crisp, Raisin Bran and Sugar Rice Krinkles to excess. The Dick Tracy Magic Decoder was an integral part of American advertisements in the 1950s, encouraging children to eat their breakfast cereals while also capturing their interest in rudimentary code breaking. THE 340 CIPHER WAS CRACKED ON DECEMBER 3RD 2020 BY DAVE ORANCHAK, SAM BLAKE AND JARL VAN EYCKE, SO THIS EARLIER ARTICLE SHOULD BE VIEWED IN RESPECT TO RECENT DEVELOPMENTS.
