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+==== The Code Book ====
+[[reading notes]] on 'the code book' by simon singh, 1999. isbn 0-385-49532-3
+==== the cipher challenge ====
+  * the challenge http://www.simonsingh.com/Cipher_Challenge.html
+  * the solution http://codebook.org/codebook_solution.html
+see also : [[Cryptography]]