Swedish Signal Intelligence 1900-1945

"a must-read for intelligence professionals. The detailed explanation of cryptology, coding, and the way SIGINT is produced puts this book ahead of other, more technical, texts. Historians interested in World War II may even have to reconsider some events of that war after reading this book." - Air & Space Power Journal"illuminating and reliable account of some of the key activities of the Allied secret services and of their German counterparts in Sweden" - Surveillant

• a definitive account of the evolution of Swedish signal intelligence between 1900 and 1945...an interesting and surprisingly revealing source of European cryptology in the first half of the twentieth century, with many examples of how ciphers were solved. There are fascinating glimpses into the development of Swedish intelligence contacts, with accounts of Swedish-German cryptanalytical cooperation during World War I in intercepting and solving Russian diplomatic telegraph traffic. There is also an authoritative account of Swedish success against German and Soviet traffic during World War II.- Cryptologia