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 Army's 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.
