- 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
- Cipher Mysteries - News, views, research and reviews of historical ciphers in fiction and non-fiction.
- Crypto Museum - Photos, manuals, and other information about the German Enigma, the M-209, and other old encryption machines.
- Cryptography - Something on cryptography. PGP. RSA.
- 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.
- Enigma Java Applet - A Java applet that simulates a WWII German Enigma encryption machine.
- Enigma Machine - Flash based working Enigma machine to code and decode messages.
- History of Cryptography and Secrecy Systems - A historical overview of early cryptographic techniques.
- USS Pampanito - ECM Mark II - What was the ECM Mk II and why was it important.
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