I am wondering about things like SIP Encryption. SMS Encryption. XMPP + OTR. (I know pidgin is an option, but the built in app should be able to do it). How about a mail client with built in PGP functionality (with GPG)? How about LUKS + dm-crypt ? eCryptfs? If these questions are not appropriate for this thread, I beg yoru pardon. Please direct me elsewhere.