Cypherpunkprivacy and cryptography who communicate through the cypherpunks mailing list. In its heyday, the list discussed the public policy issues related to cryptography, as well as more practical nuts-and-bolts mathematical, computational, technological, and cryptographic matters themselves.
A coderpunks list, open by invitation only, existed for a time. Coderpunks took up more technical matters and had less discussion of public policy implications.
There is a short section about the cypherpunks in Applied Cryptography ISBN 0471117099, written by Bruce Schneier.
The term cypherpunk was coined by Jude Milhon as a pun to describe cyberpunks who used cryptography.
The mailing list's best days have been behind it for some time, possibly peaking around 1997.