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With a new chapter on computer security issues, this updated and revised history of codes and codebreaking takes the reader from the protocryptography of Egyptian Pharoah Khnuumhotep II through to the speculations of scientists solving messages from outer space.
Reviews
Prepublication National Security Agency Evaluation, now declassified The book in its entirelty constitutes the most publicly revealing picture that has ever been presented of U.S. Sigint activities and the agencies engaged in this field.