The FBI has confirmed that the Zodiac Killer’s 340-character cipher sent to the San Francisco Chronicle 51 years ago has been cracked. David Oranchak, Sam Blake and Jarl Van Eycke used the AZdecrypt software to help them solve the puzzle.
“I hope you are having lots of fun in trying to catch me. I am not afraid of the gas chamber because it will send me to paradice (sic) all the sooner because I now have enough slaves to work for me”
A guide to the methods used is available on YouTube... https://www.youtube.com/watch?v=-1oQLPRE21o