Cryptography is the art of creating and using cryptosystems. Cryptosystems are methods of rendering messages such that only a select group of people may read them in the original form. This category contains sites related to cryptography, as well as cryptanalysis (the art of breaking cryptosystems).
Please submit websites that discuss cryptography and/or cryptanalysis. Avoid submitting sites that only link to encryption software, those should be submitted to Computers/Security/Products_and_Tools/Cryptography

Sites on password recovery and/or generation should only be submitted if they are not simply downloads, but provide some kind of discussion on the concepts involved.