Colossus

In 1940, almost a year after the outbreak of the Second World War, Allied radio operators at an interception station in South London began picking up messages in a strange new code. They invented a machine called Colossus to decipher what turned out to be the secrets of Nazi high command. This book [...]
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In 1940, almost a year after the outbreak of the Second World War, Allied radio operators at an interception station in South London began picking up messages in a strange new code. They invented a machine called Colossus to decipher what turned out to be the secrets of Nazi high command. This book talks about this event.