Cryptanalysis

cold-case-criminal-investigation

The Zodiac Killer was an unidentified serial attacker active mainly in Northern California in the late 1960s, known for taunting police and the public with letters, ciphers, and...

true crime

By mid 1970s, a self identified serial killer using the name Zodiac had terrorized Northern California with a series of mailings that combined claimed murders, ciphers, and taun...