50 codes that changed the world

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There have been secret codes since before the Old Testament, and there were secret codes in the Old Testament too. Almost as soon as writing was invented, so too were the devious m eans to hide messages and keep them under the wraps of secrecy. In '50 Codes that Changed the World', Sinclair McKay explores these uncrackable codes, secret cyphers and hidden messages from across time to tell a new history of a secret world. Show more