- 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.
- Cryptography Tutorial
- Tutorial for learning the most common classical and modern ciphers and to understand how modern encryption techniques can protect your privacy. Includes lessons on the Caesar, Linear, Polyalphabetic, and RSA ciphers.
- 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.
- National Cryptologic Museum
- Cryptology exhibits run by the National Security Agency.
 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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