Christie's is selling a German three-rotor Enigma cipher machine, from around 1939, as part of its natural history sale next month. The code machine, estimated to be worth £40,000-£60,000 was widely used during World War II to encrypt and decode messages sent between the military and its commanders.
Its interchangeable rotors made a total of 15 billion billion possible readings for each character. This was considered too complex to be broken, but due to the efforts of Alan Turing and a team of analysts at Bletchley Park, the mechanism was cracked, enabling the allies to read all secure messages
More top news
Labour leader tells May Day rally his party 'stand absolutely against racism in any form'.
Video has emerged of a police car colliding with a cyclist and driving over a bike during a mass bike ride in central London.
Harlesden's James DeGale has successfully defended his IBF super middleweight title against Rogelio Medina.