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substitution cipher
Cracking codes
In the first of two articles,
Artur Ekert
takes a tour through the history of codes and the prospects for truly unbreakable quantum cryptography.
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Decoding a war time diary
An account of how a prisoner of war's diary was recently decoded. Donald Hill wrote his diary in a numerical code, disguised as a set of mathematical tables, while in Hong Kong during and after the Japanese invasion of 1941.
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