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
Downing Street has hit back at Stormzy by stating Theresa May is "absolutely committed" to supporting people affected by the Grenfell fire.
Sadiq Khan said risking the safety of Londoners was 'the height of recklessness'.
City Hall’s share of council tax - known as the precept - will rise by 5.1%, adding £14.20 a year to the average household bill.