This focus naturally percolates over into something like this FAQ, just as someone primarily interested in the mechanics of PGP would devote more space to PGP issues than I have. Gary Jeffers, for example, devotes most of his “CEB” to issues surrounding PGP. Will leave out some of the highly detailed items… Clipper, LEAF, escrow, Denning, etc. a myriad of encryption programs, bulk ciphers, variants on PGP, etc.