Lewand:
http://faculty.goucher.edu/blewand/cryptomath/
Simon Singh 's Crypto Links:
http://www.simonsingh.net/owtasite/295
Codes Ciphers and Codebreaking--extensive:
http://www.vectorsite.net/ttcode.html
A Crypto Course Resource Page:
http://www.bradley.edu/academics/las/is/is306-cryptology.html
Vigenere, breaking:
http://math.ucsd.edu/~crypto/java/EARLYCIPHERS/Vigenere.html
The Crypto Tool Site
http://www.cryptool.com/
Crypto Tutorial
http://www.antilles.k12.vi.us/math/cryptotut/home.htm
Cryptologia Journal
http://www.dean.usma.edu/math/pubs/cryptologia/
Bletchley Park:
http://www.bletchleypark.org.uk
Bletchley Park:
http://www.project-x.org.uk/bletpark.html
Bletchley Park Station X:
http://www.bletchleypark.org.uk/
Bletchley Park:
http://www.bletchleypark.net/
Imperial War Museum Duxford:
http://www.iwm.org.uk/duxford/
Codes and Ciphers Heritage Society:
http://www.bletchleyparkheritage.org.uk/
Tony Sales's Codes and Ciphers in Second World War Page:
http://www.codesandciphers.org.uk/
The Rebuild of Heath Robinson:
http://www.qufaro.demon.co.uk/hrob/hrrindex.htm
Harry Hinsley Speech on Ultra, transcript:
http://www.cl.cam.ac.uk/Research/Security/Historical/hinsley.html
Bletchley Park Computer Museum webpage:
http://www.retrobeep.com/
NSA:
http://www.nsa.gov/
National Cryptological Museum:
http://www.nsa.gov/museum/index.html
NSA "Hall of Honor", brief bios of major figures in US cryptanalysis:
http://www.nsa.gov/honor/index.html
Internet Crypto and Security Links:
http://www.montegen.com/html/body_security____intrusion__1999.htm
Navajo Codetalkers:
http://www.lapahie.com/NavajoCodeTalker.cfm
Codetalkers Dictionary and Codes:
http://www.history.navy.mil/faqs/faq61-4.htm
Rejewski:
http://www.impan.gov.pl/Great/Rejewski/article.html
Polish decryption effort:
http://math.ucsd.edu/~crypto/students/enigma.html
http://webhome.idirect.com/~jproc/crypto/enigs1.html
Enigma--simulator and extensive etc:
http://www.xat.nl/enigma/
Nice Bibliography on Enigma and Purple:
http://www.au.af.mil/au/aul/bibs/decwar/dwultr.htm
Magic:
http://history.acusd.edu/gen/WW2Timeline/magic.html
Purple and Magic (from Budniansky book):
http://www.worldwar2history.info/Midway/war.html
NOVA, Decoding Nazi Secrets:
http://www.pbs.org/wgbh/nova/decoding/
A Raft of Cipher Machine Simulators:
http://frode.home.cern.ch/frode/crypto/simula/index.html
Cipher Machines and Simulators:
http://www.eclipse.net/~dhamer/cipher_machines.htm
Enigma Simulator:
http://homepages.tesco.net/~andycarlson/enigma/enigma_j.html
Frank B Rowlett:
http://www.fas.org/irp/agency/inscom/journal/98-oct-dec/article6.html
Joseph J Rochefort:
http://www.worldwar2history.info/Midway/Rochefort.html
Andrew Hodges:
http://www.synth.co.uk/main.html
Alan Turing: