US Edition1965 Cryptanalysis Training Workbook Released by the NSA - Schneier on Security
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1965 Cryptanalysis Training Workbook Released by the NSA - Schneier on Security
In the early 1960s, National Security Agency cryptanalyst and cryptanalysis instructor Lambros D. Callimahos coined the term “Stethoscope” to describe a diagnostic computer program used to unravel the internal structure of pre-computer ciphertexts. The term appears in the newly declassified September 1965 document Cryptanalytic Diagnosis with the Aid of a Computer, which compiled 147 listings from this tool for Callimahos’s course, CA-400: NSA I…
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