U.S. Army Guide to Code Breaking
sebFlyte writes "From the introduction of this document, the U.S. Army's field manual guide to Cryptanalysis: 'This manual presents the basic principles and techniques of cryptanalysts and their relation to cryptography. Cryptanalytics is the art and science of solving unknown codes and ciphers.'"
(P.S. - note that the link they used for "here" doesn't even work.
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