| Snake Oil FAQ: Guide to evaluating the quality and fitness for purpose of cryptography tools. |
| 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 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. |
| International Association for Cryptologic Research (IACR): 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. |
| 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. |
| 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. |
| Why Cryptography Is Harder Than It Looks: Essay on pitfalls of implementing and using secure systems. |
Classical
