The Z13 cryptogram is a short 13-character cipher sent to the San Francisco Chronicle on April 20, 1970, in a letter beginning “My name is…”, implying the cipher conceals the Zodiac Killer’s identity. It remains unsolved.
The Z13 cryptogram is a short 13-character cipher sent to the San Francisco Chronicle on April 20, 1970, in a letter beginning “My name is…”, implying the cipher conceals the Zodiac Killer’s identity. It remains unsolved.