Sinopsis
Communications and Sigint.- Japanese Expansion 1895-1941.- The GCCS 1919-1941.- William Friedman and the US Army.- Early American Naval Sigint.- Developments in Australia.- Preparedness for Attack?- Major Technical Encryption Systems.- JN-25 and its Cryptanalysis.- Using Common Book Groups.- Recovery of a Code Book.- Breaking Additive Systems.- Making Additive Systems Secure.- Redundant Encryption.- The Scanning Distribution.- Ciphers and the Submarines.- Central Bureau 1942-1945.- Organisation and Reorganisation.- Security, Censorship and Leaks.- Conclusion.- From Pearl Harbor to Midway.- Guadalcanal and Papua.- Rabaul and the Philippines.
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