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The National Cipher Challenge

Reply To: The Library

#96360
_madness_
Participant

A smaller book, on just the Vigenère cipher and its relatives, is now available at a new lower price. On Amazon, search for “Vigenere cipher” and look for the one “by madness”. It’s blue.

If there is enough interest, I have another small book in mind, on affine and keyword ciphers etc.

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