                 PGP: Pretty Good Privacy
                   By Simson Garfinkel
                1st Edition December 1994
          430 pages, ISBN 1-56592-098-8, $24.95

We have just released PGP: Pretty Good Privacy, a guide to this free,
widely available, and highly effective encryption program. PGP (which,
indeed, stands for Pretty Good Privacy) provides protection for files and
electronic mail. Written by Phil Zimmermann and released in 1991, PGP
works on virtually every platform and has become very popular both in the
U.S. and abroad.

PGP uses state-of-the-art public key cryptography to authenticate messages,
as well as keep them secret. With PGP, you can digitally sign a message
when you send it. By checking the digital signature at the other end, the
recipient can be sure that the message was not changed during transmission
and that the message actually came from you. PGP offers a popular
alternative to U.S. government initiatives like the Clipper Chip because,
unlike Clipper, it does not allow the government or any other outside
agency access to your secret keys.

Author Simson Garfinkel has crafted both a readable technical users guide
and a fascinating behind-the-scenes look at cryptography and privacy. Part
1 of the book gives an overview of PGP; Part 2 provides background on
cryptography, battles against public key patents and U.S. government
export restrictions, and other aspects of the ongoing public debates about
privacy and free speech; Part 3 describes how to use PGP: protecting files
and email, creating and using keys, signing messages, certifying and
distributing keys, and using key servers. The detailed Appendices explain
how to get PGP from publicly available sources and how to install it on
various platforms. The book is loaded with actual examples showing how to
use PGP's many features.
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