The Zodiac Killer Cipher
Posted by Jonas Elfström Fri, 25 May 2007 16:31:00 GMT
The Zodiac Killer was a serial killer in the late sixties and maybe early seventies. He sent a number of letters to the press, including four ciphers or cryptograms and only one of them has been solved. The killer's identity remains unknown.
EDIT: At this page you can have a go at cracking it real-time. I am not convinced it's really a homophonic substition cipher since the frequency analysis shows that the 340 does not have a flat frequency distribution.
It would be nice to know what cryptographic literature was available for the public in northern California in the late sixties.