cypherpunk n.
[from cyberpunk] Someone interested in the uses of encryption via
electronic ciphers for enhancing personal privacy and guarding against
tyranny by centralized, authoritarian power structures, especially
government. There is an active cypherpunks mailing list at
cypherpunks-request@toad.com coordinating work on public-key encryption
freeware, privacy, and digital cash. See also tentacle.