Bletchley Park 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. (Historical) http://www.cranfield.ac.uk/ccc/bpark/
Andy's Enigmatic Web Page Andy's Enigmatic Web Page: Download an Enigma emulator for Windows (Historical) http://www.users.globalnet.co.uk/~andlaw/engindex.htm
Enigma Cipher Machine by Tony Sale 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. (Historical) http://www.codesandciphers.org.uk/enigma/
USS Pampanito - ECM Mark II USS Pampanito - ECM Mark II: What was the ECM Mk II and why was it important. (Historical) http://www.maritime.org/ecm2.shtml