sci.crypt Usenet newsgroup FAQ. It's posted occasiuonally to sci.crypt, but I can't think of a site (offhand) where you can FTP it.

[from the FAQ] The sections of this FAQ are available via anonymous FTP to rtfm.mit.edu as /pub/usenet/news.answers/cryptography-faq/part[xx]. The Cryptography FAQ is posted to the newsgroups sci.crypt, sci.answers, and news.answers every 21 days.