See also:
Snake Oil FAQ - Guide to evaluating the quality and fitness for purpose of cryptography tools.
Adam Back's Homepage: Cypherspace Find information on some cryptanalytic hacks, breaking weak cryptosystems and links to more cryptography related websites. http://cypherspace.org/adam/
Choosing a Good Password Tips on choosing a difficult to crack password and pitfalls in password selection. http://www.cs.umd.edu/faq/Passwords.shtml
The Cipher Challenge History of a code cracking competition. Challenge details, how it was solved, winners, essays and photo gallery. http://www.simonsingh.net/Cipher_Challenge.html
Coderpunks Little sister of the cypherpunk mailing list. Discussion of implementations of strong, robust cryptosystems. http://home.att.net/~lewis.mccarthy/InfosecProjects/Coderpunks/
Crypto Machines Features machines and systems used in secure communications. Includes brief history on cryptography. http://www.jproc.ca/crypto/
Crypto-Gram Free monthly email newsletter covering developments in cryptography and other computer security issues. http://bt.counterpane.com/crypto-gram.html
A Cryptographic Compendium Outline of the various types of cipher systems that have been used historically and the relationships between them. http://www.quadibloc.com/crypto/intro.htm
Cryptography FAQ Ten part FAQ list that is essential reading for any newcomer to cryptography. http://www.faqs.org/faqs/cryptography-faq/
Cryptography World Introduction to cryptography, including concepts, key management and application. http://www.cryptographyworld.com
CryptoMX Tools Set of cryptography tools written entirely in JavaScript, designed to work on any computer with a JavaScript capable browser. http://cryptomx.sourceforge.net
Cypherpunks Group, with mailing list, that is interested in privacy and cryptography. ftp://ftp.csua.berkeley.edu/pub/cypherpunks/mailing_list/index.html
Deschall Articles describing the first crack of a DES-encrypted message, with some source code and mailing list archives. http://www.interhack.net/projects/deschall/
Frode Weierud's Cryptology Page History of cryptography, cipher machines and their simulation, cryptanalysis and other code breaking techniques. http://frode.home.cern.ch/frode/crypto/
The Munitions Maker Graphic Campaign to distribute image (rsa2d.gif) in protest of ITAR regulations that treat encryption as munitions. http://online.offshore.com.ai/arms-trafficker/rsa2d.html
Randomness and the Netscape Browser Article about cracking the original Netscape encryption algorithm, and links to resources for generating crypto strength randomness. http://www.cs.berkeley.edu/~daw/netscape-randomness.html
RSA - Hacking and Cracking Discusses security problems and possible attacks against the RSA cryptosystem. http://members.tripod.com/irish_ronan/rsa/
Standard Cryptographic Algorithm Naming Provides references for a collection of cryptographic algorithms, assigning each an ASCII name and zero or more aliases. http://www.users.zetnet.co.uk/hopwood/crypto/scan/
Strong Cryptography Links on the Internet Dealing with cryptography, information security, cryptographers government, commercial, university, and personal sites, newsgroups, publications, programs and applications. http://www.c4i.org/erehwon/crypto.html