Zodiac killer cipher, October 20, 1968, Benicia, California, USA. A motorcyclist found the bodies of a young couple in the alley. A few months later, another couple was shot in a park several kilometers away. The killer later reported to the police station in the telephone booth. In addition to acknowledging his own murder, he also claimed responsibility for the first murder.

zodiac 408 cipher and 340 cipher

On August 1, 1969, the killer sent an e-mail to three local newspapers at the same time, claiming that he was a criminal and proved the details of the killing scene. At the same time, he also put different encrypted text in the e-mail, threatening newspapers must be announced before August 1 (Friday), otherwise, it will be from Friday until Sunday, until killing enough 12 people. In one email, the killer claimed that the ciphertext contained his identity information. These emails have a total of 408 symbols, and they are customarily referred to as 408 ciphers.