By Bill Galluccio Photo: Getty Images A French engineer claims he has learned the identity of the Zodiac Killer after solving his two remaining ciphers. New York Times, he started working the case during the coronavirus pandemic after reading an article in a French magazine about how a team of amateur codebreakers cracked a previously unsolvable cipher from the killer. The codebreakers put the encryption key online, and Ziraoui decided to use it to solve the remaining two ciphers, Z32 and Z13, which are 32-characters and 13-characters long. The letter that contained the 32-character cipher warned that a bomb would go off at a school and told investigators they had to solve the puzzle to find out where the bomb was hidden. While investigators failed to decipher the cipher, no bomb ever went off at a school. When Ziraoui applied the encryption key to the cipher and got a random group of letters.