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Alberti Cipher Disk: The Invention That Launched Polyalphabetic Encryption

Discover how Renaissance polymath Leon Battista Alberti designed the first polyalphabetic cipher system using two rotating disks. This guide covers his biography, the mechanics of the Alberti disk, the groundbreaking treatise De componendis cifris, and the cipher's lasting influence on Trithemius, della Porta, and Vigenere.

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