The Zodiac Killer Cipher (1969) In the 1960s and early 1970s, a serial killer terrorized Northern California. He left behind two cryptograms: the 408-character code was broken in a matter of days; The 340-character one was remains a riddle, more than four decades later. The Zodiac has never been apprehended.
8 Awesome Secret Codes for Kids - Type your own Top Secret message into the template and it will automatically encrypt to match the Cipher! Great as Spy Party games / activities, for playdates or even in the school classroom as code breaking games