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A Cryptographic Compendium - http://www.quadibloc.com/crypto/intro.htm
Outline of the various types of cipher systems that have been used historically and the relationships between them.

Adam Back's Homepage: Cypherspace - http://cypherspace.org/adam/
Find information on some cryptanalytic hacks, breaking weak cryptosystems and links to more cryptography related websites.

An Overview of Cryptography by Gary C. Kessler - http://www.garykessler.net/library/crypto.html
Defines cryptographic terms and concepts, offers crypto scheme comparison, and provides some real world examples.

Choosing a Good Password - http://www.cs.umd.edu/faq/Passwords.shtml
Tips on choosing a difficult to crack password and pitfalls in password selection.

Coderpunks - http://home.att.net/~lewis.mccarthy/InfosecProjects/Coderpunks/
Little sister of the cypherpunk mailing list. Discussion of implementations of strong, robust cryptosystems.

Crypto Machines - http://www.jproc.ca/crypto/
Features machines and systems used in secure communications. Includes brief history on cryptography.

Crypto-Gram - http://bt.counterpane.com/crypto-gram.html
Free monthly email newsletter covering developments in cryptography and other computer security issues.

Cryptography FAQ - http://www.faqs.org/faqs/cryptography-faq/
Ten part FAQ list that is essential reading for any newcomer to cryptography.

Cryptography World - http://www.cryptographyworld.com
Introduction to cryptography, including concepts, key management and application.

CryptoMX Tools - http://cryptomx.sourceforge.net
Set of cryptography tools written entirely in JavaScript, designed to work on any computer with a JavaScript capable browser.

Cypherpunks - ftp://ftp.csua.berkeley.edu/pub/cypherpunks/mailing_list/index.html
Group, with mailing list, that is interested in privacy and cryptography.

Deschall - http://www.interhack.net/projects/deschall/
Articles describing the first crack of a DES-encrypted message, with some source code and mailing list archives.

Frode Weierud's Cryptology Page - http://frode.home.cern.ch/frode/crypto/
History of cryptography, cipher machines and their simulation, cryptanalysis and other code breaking techniques.

Handbook of Applied Cryptography - http://www.cacr.math.uwaterloo.ca/hac/
Reference work available for free download (with restrictions) from the Web.

International Association for Cryptologic Research (IACR) - http://www.iacr.org/
Non-profit scientific organisation intended to further research in cryptology.

International Cryptography Freedom - http://www.piracy.com
Links to cryptography related downloads and information from around the world.

Randomness and the Netscape Browser - http://www.cs.berkeley.edu/~daw/netscape-randomness.html
Article about cracking the original Netscape encryption algorithm, and links to resources for generating crypto strength randomness.

RSA - Hacking and Cracking - http://members.tripod.com/irish_ronan/rsa/
Discusses security problems and possible attacks against the RSA cryptosystem.

Snake Oil FAQ - http://www.interhack.net/people/cmcurtin/snake-oil-faq.html
Guide to evaluating the quality and fitness for purpose of cryptography tools.

Standard Cryptographic Algorithm Naming - http://www.users.zetnet.co.uk/hopwood/crypto/scan/
Provides references for a collection of cryptographic algorithms, assigning each an ASCII name and zero or more aliases.

Strong Cryptography Links on the Internet - http://www.c4i.org/erehwon/crypto.html
Dealing with cryptography, information security, cryptographers government, commercial, university, and personal sites, newsgroups, publications, programs and applications.

The Cipher Challenge - http://www.simonsingh.net/Cipher_Challenge.html
History of a code cracking competition. Challenge details, how it was solved, winners, essays and photo gallery.

The Munitions Maker Graphic - http://online.offshore.com.ai/arms-trafficker/rsa2d.html
Campaign to distribute image (rsa2d.gif) in protest of ITAR regulations that treat encryption as munitions.

Why Cryptography Is Harder Than It Looks - http://www.schneier.com/essay-037.html
Essay on pitfalls of implementing and using secure systems.

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