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GCHQ has released documents claiming they had developed public key cryptography before the publication of Diffie and Hellman's paper. [citation needed] Various classified papers were written at GCHQ during the 1960s and 1970s which eventually led to schemes essentially identical to RSA encryption and to Diffie–Hellman key exchange in 1973 and ...
1931 – The American Black Chamber by Herbert O. Yardley is published, revealing much about American cryptography; 1940 – Break of Japan's PURPLE machine cipher by SIS team; December 7, 1941 – attack on Pearl Harbor; U.S. Navy base at Pearl Harbor in Oahu is surprised by Japanese attack, despite U.S. breaking of Japanese codes.
The cryptoperiod was still usually one day. These systems were introduced in the late 1960s and stayed in use until the mid-1980s. They required a great deal of care and maintenance, but were not vulnerable to EMP. The discovery of the Walker spy ring provided an impetus for their retirement, along with remaining first generation systems.
William Hamilton Martin and Bernon F. Mitchell, U.S. National Security Agency cryptologists who defected to the Soviet Union in 1960 Leo Marks UK, SOE cryptography director, author and playwright. Donald Michie UK, GC&CS , Bletchley Park worked on Cryptanalysis of the Lorenz cipher and the Colossus computer .
Cryptography: A Primer, John Wiley & Sons, ISBN 0-471-08132-9. Written by one of the IBM team who developed DES. Mao, Wenbo (2004). Modern Cryptography Theory and Practice ISBN 0-13-066943-1. An up-to-date book on cryptography. Touches on provable security, and written with students and practitioners in mind. Mel, H.X., and Baker, Doris (2001).
Horst Feistel. Block Cipher Cryptographic System, US Patent 3,798,359. Filed June 30, 1971. (IBM) Henry Beker and Fred Piper (1982). Cipher Systems: The Protection of Communications.
In 1955, the AFSAM-7 was renamed TSEC/KL-7, following the new standard crypto nomenclature. It was the most widely used crypto machine in the US armed forces until the mid-1960s and was the first machine capable of supporting large networks that was considered secure against known plaintext attack. Some 25,000 machines were in use in the mid-1960s.
The Codebreakers – The Story of Secret Writing (ISBN 0-684-83130-9) is a book by David Kahn, published in 1967, comprehensively chronicling the history of cryptography from ancient Egypt to the time of its writing. The United States government attempted to have the book altered before publication, and it succeeded in part.