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The world's first fully-functioning electronic digital computer, Colossus was used during World War 2 at Bletchley Park, where it played an invaluable role cracking enemy codes. Until very recently, much about the Colossus machine was shrouded in secrecy, largely because the codes that were employed remained in use by the British security services until a short time ago. This book only became possible due to the declassification in the US of wartime documents. With an introductory essay on cryptography and the history of code-breaking by Simon Singh, this book reveals the workings of Colossus and the staff at Bletchley Park through personal accounts by those who lived and worked with the computer. Among them is the testimony of Thomas Flowers, who was the architect of Colossus and whose personal account is published here for the first time.

Lorenz cipher system. --- World War, 1939-1945 --- Cryptography --- Computers --- Cryptanalysis --- Cryptology --- Secret writing --- Steganography --- Signs and symbols --- Symbolism --- Writing --- Ciphers --- Data encryption (Computer science) --- European War, 1939-1945 --- Second World War, 1939-1945 --- World War 2, 1939-1945 --- World War II, 1939-1945 --- World War Two, 1939-1945 --- WW II (World War, 1939-1945) --- WWII (World War, 1939-1945) --- History, Modern --- Lorenz machine (Cryptography) --- Tunny cipher system --- Machine ciphers --- Automatic computers --- Automatic data processors --- Computer hardware --- Computing machines (Computers) --- Electronic brains --- Electronic calculating-machines --- Electronic computers --- Hardware, Computer --- Computer systems --- Cybernetics --- Machine theory --- Calculators --- Cyberspace --- Electronic intelligence --- History. --- Great Britain. --- GC&CS --- Lorenz cipher system --- History --- World War, 1939-1945 - Cryptography --- World War, 1939-1945 - Electronic intelligence - Great Britain --- Cryptography - Germany - History --- Cryptography - Great Britain - History --- GC&CS (Government Code and Cypher School) --- GCHQ (Government Communications Headquarters) --- G.C.H.Q. (Government Communications Headquarters) --- Station X (Great Britain) --- Bletchley Park (Agency : Great Britain)