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 ...

Enigma cipher machines have endured in the minds of history buffs and cryptography hobbyists for more than a century, still discovered at dusty French flea markets and dredged up from under beach ...

Enigma machines were used by the Nazis to encrypt and decrypt secret military, commercial, and diplomatic information. The post Rare WWII German Enigma machine sells for over $250,000 appeared first ...