Military Cryptanalytics

From Wikipedia, the free encyclopedia

Military Cryptanalytics (or MILCRYP as it is sometimes known) is a revision by Lambros D. Callimahos of the series of books written by William F. Friedman under the title Military Cryptanalysis. It also contains contributions by other cryptanalysts. It was a training manual for National Security Agency and military cryptanalysts. It was published between 1957 and 1977, though parts I and II were written in 1956 and 1959.

The book consists of several parts, the first two of which have been declassified; the third has so far only been released in such a severely redacted form that it wasn't considered worth publishing on its own. (The unredacted portions repeat material from the first two parts.)

Parts IV through VI were contemplated by Lambros D. Callimahos, but not completed before his death.

Both Military Cryptanalytics and Military Cryptanalysis have been subjects of FOIA requests, including one by John Gilmore.

Parts I and II are available from Aegean Park Press. Each part consists of two volumes: the first volume contains the tutorial text and the second volume contains appendices. Part I includes material on both uniliteral and multiliteral ciphers and polyalphabetic ciphers. Part II includes material on repeating-key and bipartite systems and periodic ciphers. Part II, volume II includes the Zendian Problem, a practical exercise in traffic analysis and cryptanalysis.

For the Aegean Park Press edition, Wayne G. Barker added programs for the TRS-80.