Colossus

Colossus was a series of British electronic digital computers built at Bletchley Park during World War II to help decrypt German Lorenz cipher messages.

Lorenz cipher: A German electromechanical cipher machine system used for high-level communications during World War II. Colossus tested candidate settings and message patterns for this cipher.
Bletchley Park: A British wartime codebreaking centre in Buckinghamshire. Colossus was built and operated within its codebreaking organization.
Dorothy Du Boisson: A British engineer who worked on the construction and maintenance of Colossus computers. Her engineering work helped keep the machines operating at Bletchley Park.
Colossus Mark II: An improved Colossus computer introduced in 1944 with faster and more flexible processing. Its deployment increased the volume of Lorenz traffic that could be analyzed.
Bombe: An electromechanical machine used by British cryptanalysts to help find Enigma settings. The Bombe attacked Enigma, while Colossus analyzed Lorenz cipher traffic.
Tunny: The British codebreakers’ name for German teleprinter traffic enciphered by the Lorenz machine. Colossus processed Tunny traffic to help recover its plaintext.
Bill Tutte: A British mathematician whose wartime work reconstructed the structure of the Lorenz cipher without seeing the machine. His statistical deductions made the cipher’s weaknesses computationally exploitable.
Doreen Bunney: A British wartime operator who worked with Colossus at Bletchley Park. Women operators configured and ran Colossus during routine cryptanalytic work.
D-Day: The Allied landings in Normandy on 6 June 1944. Colossus-assisted intelligence helped assess German communications during the campaign surrounding the invasion.
ENIAC: A large American electronic general-purpose computer completed in 1945. ENIAC was designed for broader numerical computation; Colossus specialized in cryptanalysis.

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