Summary: Of all the notorious serial killers of the 20th century, only San Francisco’s Zodiac remains at large. A cold-blooded psycho stalking the nightmare streets of the late 1960s, he left behind at least five dead victims. The menacing sociopath sent more than two dozen letters to the newspapers, including four weird ciphers. Only the first code was cracked, and it began: I LIKE KILLING PEOPLE BECAUSE IT IS SO MUCH FUN. His last three ciphers, including the infamously unintelligible Z340, have confounded cryptographers and computer science professionals alike.
