Colossus: The secrets of Bletchley Park's code-breaking computers

The American ENIAC is customarily regarded as the first electronic computer. In this fascinating volume, Jack Copeland rewrites the history of computer science, arguing that in reality Colossus—the giant computer built in Bletchley Park by the British secret service during World War II—predates ENIAC by two years. Until very recently, much about the Colossus machine was shrouded in secrecy, largely because the code-breaking algorithms employed during World War II remained in use by the Brit...