Historical

See also:

Andy's Enigmatic Web Page - Download an Enigma emulator for Windows
Crypto Museum - Photos, manuals, and other information about the German Enigma, the M-209, and other old encryption machines.
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.
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.
German ENIGMA Cipher Machine - History of Solving - Describes the efforts of Polish, France and Great Britain in deciphering the Enigma Machine's code from 1932 to 1945. [English, Polish]
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.