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Codes and ciphers : Julius Caesar, the Enigma, and the internet / R.F. Churchhouse

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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Girls Frontline 2 codes December 2025

December 22, 2025: We checked for new Girls Frontline 2 codes. What are the latest Girls Frontline 2 codes? GF2 Exilium is different from anything you've seen so far, thanks to its thrilling, ...
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Five Nights TD 2 codes December 2025

December 21, 2025: We have two new FNTD2 codes in for UPD 8. What are some new Five Nights TD 2 codes? The latest list of working free FNTD 2 game codes we've put together in this guide has been fully ...
insider.si.edu

History of cryptography and cryptanalysis codes, ciphers, and their algorithms John F. Dooley

Introduction: A revolutionary cipher -- Cryptology before 1500: a bit of magic -- The black chambers: 1500-1776 -- Crypto goes to war: the American Revolution -- Crypto goes to war: the American Civil ...