Turing is celebrated for his work in deciphering messages encrypted by the German Enigma machine.

BBC: Suffolk

Bletchley Park was the wartime home of the Government Code and Cypher School which broke the codes generated by the German Enigma machine, using the Bombe.

BBC: Bletchley Park Enigma code hut to be restored

Nothing much happened, however, until 1946 when an American mathematician called Warren Weaver became intrigued with the way the British had used their pioneering Colossus computer to crack the military codes produced by Germany's Enigma encryption machines.

ECONOMIST: A gift of tongues

While he denied his involvement in the coup at the time, he conceded in Enigma, authored by Nigerian Babafemi Badejo in 2006, that he played a central role in it.

BBC: Raila Odinga: Third time lucky in Kenya?

The Enigma machine was used by the German navy, air force and army to send encrypted messages.

BBC: Bletchley Park Enigma code hut to be restored

They are being led by Joseph Kony, who is an enigma.

NPR: Child Soldiers Fight Forgotten War in Uganda

The mysterious Topsy plays fast and loose with the so-called 23 Enigma, a phenomenon noted by William Burroughs and the occultist Aleister Crowley, based on the number's supposedly uncanny recurrence in historical, scientific and artistic spheres.

CNN: Review: '23' is a bad number