A French polytechnician would have succeeded in penetrating the last two codes deemed indecipherable of the Zodiac killer, thus finding his identity. A suspect already known to the FBI, and who died in 2010 …
Short flashback sequence. In December 2020, we learned that three amateur detectives had finally managed to decipher, 50 years later, a letter posted in 1969 by the mysterious killer of the Zodiac, which was the subject of a brilliant film directed by David Fincher.
Here is also the trailer for this wonderful Fincher film …
The killer, whose identity no one has ever succeeded in establishing, and who claimed 37 murders committed in California between the end of the 60s and the beginning of the 70s, has notably remained infamous for his indecipherable messages.
Developed using a particularly complex technique and composed of 340 different characters (to be deciphered using a very precise reading direction), the text of this letter, called Z 340, still did not reveal the identity of the killer as could be hoped. investigators, but contented himself with provoking his readers: “‘Hope you have a lot of fun trying to catch me. It wasn’t me on the TV show. (…) I’m not afraid of the gas chamber because it will send me to heaven faster, because I now have enough slaves to work for me. ” The slaves being in this case the victims of this serial killer … The FBI, which reopened the investigation in the early 2000s, did not wish to comment on this discovery.
Z 32 and Z 13 cryptograms
This is where the discoveries made by a French polytechnician named Fayçal Ziraoui come into play, the subject of a long and fascinating article published on thehe Le Point magazine website on February 17th. By deciphering the last two cryptograms sent by the killer, the amateur detective claims to have unmasked the serial killer.
Frequenting sites specializing in cryptography, he discovers that of the four cryptograms sent by the killer, two are still waiting to be deciphered: the Z 32 and the Z 13, which some specialists consider “indecipherable” because of their low number of characters. “It took me fifteen days to decode the last two cryptograms of the Zodiac. I think it’s good” specifies the person concerned to the magazine.
After calculations based on trigonometry, probabilities, with the support of semiology and geomagnetic fields, he pierces the first cryptogram, the Z 32. This is a code dated June 1970, attached to a letter in which the killer threatened to blow up a school bus at the start of the following school year. A road map containing several topographical indices accompanied it. “I quickly understood that the four cryptograms were responding to each other and that the decoding of the Z 340, recently accomplished, would be necessary for me to end up on the Z 32. In fact, the cryptograms are impossible to resolve independently of each other” he explains. “To overcome the last two cryptograms, I had to use unconventional resolution mechanisms and cut a code into 2, knowing that the Z 32 only used 10 digits for 20 converted letters this time.”
In Z 32, Fayçal Ziraoui discovers that the zodiac killer was planning to blow up a school near Lake Tahoe, located between California and Nevada, on the Labor Day holiday in 1970. “It turns out that the suspect, whose name I will discover in the other code (Z 13), lived very close to the targeted establishment” he said. He thus manages to identify a name: a certain Lawrence kayr. If the “r” of the last name seems to be an error, or a final maneuver of the killer to cover their tracks, this name does correspond to a suspect identified by the FBI, and who died in 2010.
Fayçal Ziraoui hastened to send his findings to the San Francisco Police, who acknowledged receipt, as well as to the FBI. “I would like the FBI to follow this trail, because it is promising “ he said to the reporter. But it’s a safe bet that, much like the decryption of the Z 340 code, the FBI does not publicly comment on this fantastic discovery.