Laguna Hills, CA 1989 Trade paperback Very good. No dust jacket as issued. vii, , 99 p. Footnotes. Illustrations. Index. This is number 54 of their Cryptographic Series. This
completes the republication of National Archives document SRH-001, which was the Historical Background of the Signal Security Agency. The information released by the National Archives had been "sanitized" and the editor used other sources to fill in some gaps and where it was deemed appropriate the editor also made comments about some statement of fact or information found in the text. This work focuses on the Signal Intelligence Service Cryptanalysts who broke the Purple Cipher machine.
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