RE codes, short for reenlistment eligibility or reentry eligibility codes, are alphanumeric codes that indicate eligibility to reenlist after military separation. Each code reflects the circumstances ...
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 ...
From bizarre ancient markings to random numbers and letters, codes and ciphers have been used for millennia to send secret messages, hide identities and operate outside the law. Unravelling these ...
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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