The mystery serial killer would claim the lives of at least five victims and was in the midst of his protracted cat-and-mouse game with police and the media. He had at that stage attacked two young ...
1. Introduction -- 2. From Julius Caesar to simple substitution -- 3. Polyalphabetic systems -- 4. Jigsaw ciphers -- 5. Two-letter ciphers -- 6. Codes -- 7. Ciphers for spies -- 8. Producing random ...
During the Cold War, numbers stations became prolific as high-security, low-risk spy tools to send secret messages to operatives in the field. However, as early as World War I, espionage agencies were ...
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