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 ...

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A newly invented cipher may shed light on how the mysterious Voynich manuscript was made in medieval times. When you purchase through links on our site, we may earn an affiliate commission. Here’s how ...

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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 ...