The other Ultra : [codes, ciphers and the defeat of Japan]

The Story Of The Contribution Made To The Second World War In Europe And North Afica By Ultra, The Intelligence Derived From The Decipherment Of The Germans' Enigma-coded Signals, Is Now Well Known. Ronald Lewin's The Other Ultra, Based On Contemporary Secret Documents Only Recently Released, Tells For The First Time The Story Of The Immense Contribution Made By Signal Intelligence To The War Against Japan. This Intelligence Was Of Two Kinds: The Intelligence Known As Magic, Gathered From The Breaking Of The Japanese Diplomatic Signals Enciphered On The Machine Called Purple; And The Intelligence Derived From The Breaking Of The Japanese Naval And Military Codes, Know To The Americans As Ultra. Ronald Lewin. Includes Index. Bibliography: P. 309-311.