See also:

• Computers: History: Pioneers: Flowers, Tommy  (2)
• Science: Math: Applications: Communication Theory: Cryptography: Historical  (9)

• Bletchley Park Museum : Lorenz Cipher Machine - Descriptions of the Lorenz cipher machine and the Colossus computer built to crack the code. Information on the rebuild of a working Colossus.
• Colossus at Bletchley Park - History and photos.
• How a Computer saved the world - Article from the American Computer Science Association about the history of Colossus (and IBM's involvement in WWII).
• IEEE Computer Society: Colossus - Brief description and photos.
• Nationmaster Encyclopedia: Colossus computer - The purpose, origins, and design of the world's first programmable digital electronic computer.
• Take a Tour of Bletchley Park - Information and photos on the Colossus rebuild project at Bletchley Park.