Alan Turing

Alan Mathison Turing was a British mathematician, logician, cryptanalyst, and pioneer of computer science. His 1936 paper, On Computable Numbers, with an Application to the Entscheidungsproblem, described an abstract machine capable of carrying out logical operations—a foundational model for digital computation.

Cryptanalysis at Bletchley Park

Turing joined the Government Code and Cypher School before the Second World War and reported to Bletchley Park in September 1939. Building on Polish cryptanalytic work, he helped design the Bombe method used against German Enigma traffic and led Hut 8's naval Enigma work.

Computing and security history

Turing's legacy connects theory, engineering, and cryptanalysis: computing machines make security systems possible, while cryptanalysis tests the assumptions on which those systems depend. It is in that broad, historically grounded sense that he is often included among the great hackers and security thinkers.

In memoriam

Turing died in 1954 after being convicted under laws that criminalized homosexual activity. The United Kingdom granted him a posthumous royal pardon in 2013; his scientific and wartime contributions endure.

Timeline

• 1912-06-23Born in London, England.
• 1936Publishes On Computable Numbers, introducing the abstract machine now called a Turing machine.
• 1939Begins work at Bletchley Park on Enigma cryptanalysis.
• 1940Bombe methods are in operational use against Enigma-encrypted messages.
• 1954Dies in Wilmslow, England.
• 2013Receives a posthumous royal pardon in the United Kingdom.