GCHQ Christmas card sets annual code-cracking challenge

GCHQ released their annual Christmas card on Wednesday, filled with puzzles and hidden codes designed to help children aged 11-18 test a range of problem-solving skills. The card was created by ...
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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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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 ...
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Codes that remain uncracked to this day

In the internet age, encryption feels like a modern concept. But in fact, communicating in codes and ciphers has been around ...