A Cryptographic Compendium
Outline of the various types of cipher systems that have been used historically and the relationships between them.
Adam Back's Homepage: Cypherspace
Find information on some cryptanalytic hacks, breaking weak cryptosystems and links to more cryptography related websites.
An Overview of Cryptography by Gary C. Kessler
Defines cryptographic terms and concepts, offers crypto scheme comparison, and provides some real world examples.
Choosing a Good Password
Tips on choosing a difficult to crack password and pitfalls in password selection.
Coderpunks
Little sister of the cypherpunk mailing list. Discussion of implementations of strong, robust cryptosystems.
Crypto Machines
Features machines and systems used in secure communications. Includes brief history on cryptography.
Crypto-Gram
Free monthly email newsletter covering developments in cryptography and other computer security issues.
Cryptography - An Overview
Introduction to cryptography, listing main techniques and algorithms.
Cryptography FAQ
Ten part FAQ list that is essential reading for any newcomer to cryptography.
Cryptography World
Introduction to cryptography, including concepts, key management and application.
CryptoMX Tools
Set of cryptography tools written entirely in JavaScript, designed to work on any computer with a JavaScript capable browser.
Cryptonomicon
Cryptography related articles, downloads, news, links and discussions.
Cyphernomicon
Tim May's CryptoNotes, and an introduction to the Cypherpunks.
Cypherpunks
Group, with mailing list, that is interested in privacy and cryptography.
Deschall
Articles describing the first crack of a DES-encrypted message, with some source code and mailing list archives.
Frode Weierud's Cryptology Page
History of cryptography, cipher machines and their simulation, cryptanalysis and other code breaking techniques.
Handbook of Applied Cryptography
Reference work available for free download (with restrictions) from the Web.
Home of HB9CUF
Free cryptographic tools: CryptoUP to secure and transport any kind of file; FindSR helps to analyze ciphertext.
International Association for Cryptologic Research
Non-profit scientific organisation intended to further research in cryptology.
International Cryptography Freedom
Links to cryptography related downloads and information from around the world.
MD5 Reverse Lookup
Project to record and search for mappings of MD5 hashes to their original messages.
Polymorphic Cipher Theory
Article by C. B. Roellgen discussing a class of self-compiling symmetric encryption algorithms.
Randomness and the Netscape Browser
Article about cracking the original Netscape encryption algorithm, and links to resources for generating crypto strength randomness.
RSA - Hacking and Cracking
Discusses security problems and possible attacks against the RSA cryptosystem.
Snake Oil FAQ
Guide to evaluating the quality and fitness for purpose of cryptography tools.
Standard Cryptographic Algorithm Naming
Provides references for a collection of cryptographic algorithms, assigning each an ASCII name and zero or more aliases.
Strong Cryptography Links on the Internet
Dealing with cryptography, information security, cryptographers government, commercial, university, and personal sites, newsgroups, publications, programs and applications.
The Cipher Challenge
History of a code cracking competition. Challenge details, how it was solved, winners, essays and photo gallery.
The Munitions Maker Graphic
Campaign to distribute image (rsa2d.gif) in protest of ITAR regulations that treat encryption as munitions.
VB2theMax: Inside Internet Security
Extract from chapter 19 of book on Internet security.
Webcogs: Password Generator
Generates semi-pronounceable alphanumeric passwords of 6 to 10 characters (generation method outlined).
Why Cryptography Is Harder Than It Looks
Essay on pitfalls of implementing and using secure systems.