This book reveals the historical context and the evolution of the technically complex Allied Signals Intelligence (Sigint) activity against Japan from 1920 to 1945. It traces the all-important genesis and development of the cryptanalytic techniques used to break the main Japanese Navy code (JN-25) and the Japanese Armys Water Transport Code during WWII. This is the first book to describe, explain and analyze the code breaking techniques developed and used to provide this intelligence, thus closing the sole remaining gap in the published accounts of the Pacific War. The authors also explore the organization of cryptographic teams and issues of security, censorship, and leaks. Correcting gaps in previous research, this book illustrates how Sigint remained crucial to Allied planning throughout the war. It helped direct the advance to the Philippines from New Guinea, the sea battles and the submarine onslaught on merchant shipping. Written by well-known authorities on the history of cryptography and mathematics, Code Breaking in the Pacific is designed for cryptologists, mathematicians and researchers working in communications security. Advanced-level students interested in cryptology, the history of the Pacific War, mathematics or the history of computing will also find this book a valuable resource.

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.