The art of creating and using cryptosystems. A cryptosystem (or cipher system) is a method of disguising messages so that only certain people can see through the disguise, e.g, encryption. Cryptanalysis is the art of breaking cryptosystems - seeing through the disguise even when you're not supposed to be able to. Cryptology is the study of both cryptography and cryptanalysis. Very popular in the Cyberian worlds, where there is an obsession with personal privacy.
Crypto Anarchy - Text by M. Alan Kazlev, from Anders Sandberg's Transhuman Terminology The economic and political system based on libertarianism, encryption, untraceable net-mail, digital pseudonyms, cryptographic voting, and digital cash. Very popular among Cyberians.
Cryptomemetic Index - Text by M. Alan Kazlev The degree to which an engineered meme cannot be detected, even by conventional memetic analysis. It is based on a complex of factors, most of which are incomprehensible to subsingularitan sophonts.