A Cryptographic Compendium
Discusses the types of cipher systems that have been used in the past. Page includes illustrations and tables. Written by John Savard.
Andy's Enigmatic Web Page
Download an Enigma emulator for Windows
Bletchley Park
Museum at the site of the World War II codebreaking center, including a project to rebuild Colossus, the all valve computer used to break the ciphers of German High Command.
Enigma Cipher Machine by Tony Sale
Explains how the device enciphers letters, background history, components of the machine, and military adaptation by the Germans. Also, includes information about Turing and Polish mathematicians contribution in breaking the code.
German ENIGMA Cipher Machine - History of Solving
In Polish and English.
USS Pampanito - ECM Mark II
What was the ECM Mk II and why was it important.