Cryptanalysis

true-crime history

The Zodiac Killer unsolved letters are a set of taunting communications sent to Bay Area newspapers in the late 1960s and early 1970s, claiming responsibility for murders and th...

True Crime

The Zodiac Killer code refers to the encrypted letters and cards sent by the San Francisco Bay Area serial attacker in the late 1960s and early 1970s. Four main cipher texts, se...

cryptography

Between 1969 and 1974, the Zodiac Killer sent encrypted letters to newspapers around San Francisco Bay. Of the four main cipher systems attributed to him by investigators, only...