- Black Chamber
 - Cryptographer and author of The Code Book, Simon Singh, offers a tutorial on cryptology. Learn about codes and codebreaking, encrypt your own messages, crack those of your enemies, and play with interactive enciphering programmes. - Britannica.com: Cryptology
- Article discussing the basic elements of cryptology, including a historical survey of systems and devices.
- Cryptology
- Student presentation introducing the history and basic theories of cryptography and cryptanalysis.
- Cryptology ePrint Archive
- Provides papers and resources related to recent research in cryptology.
- Frode Weierud's Cryptology Page
- Links, papers, news, and more about historical and modern cryptology.
- Historical Cryptography
- Historical ciphers, cryptogram of the week, and tools for creating and analyzing historical ciphers. From the Trinity College Department of Computer Science.
- International Association for Cryptologic Research
- Nonprofit scientific organisation dedicated to furthering research in cryptology and related fields.
 Science of Secrecy, The
- Online companion to the television series presented by Simon Singh and tracing the evolution of methods of encryption.
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