Enigma Java Applet
- A Java applet that simulates a WWII German Enigma encryption machine.
- http://homepages.tesco.net/~andycarlson/enigma/enigma_j.html

History of Cryptography and Secrecy Systems
- A historical overview of early cryptographic techniques.
- http://www.dsm.fordham.edu/~mathai/crypto.html

Cryptography
- Something on cryptography. PGP. RSA.
- http://www.hupi.hr/kripto

Crypto Museum
- Photos, manuals, and other information about the German Enigma, the M-209, and other old encryption machines.
- http://www.ilord.com/

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]
- http://www.enigmahistory.org/enigma.html

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.
- http://www.quadibloc.com/crypto/jscrypt.htm

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.
- http://www.codesandciphers.org.uk/enigma/

Andy's Enigmatic Web Page
- Download an Enigma emulator for Windows
- http://www.users.globalnet.co.uk/~andlaw/engindex.htm

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.
- http://www.cranfield.ac.uk/ccc/bpark/

USS Pampanito - ECM Mark II
- What was the ECM Mk II and why was it important.
- http://www.maritime.org/ecm2.shtml