Pretty Good Privacy, or PGP, is a freely available encryption program that allows individuals the kind of digital security previously available only to the military. This book thoroughly covers the use of PGP as well as general encryption issues. The strength of the book lies in its coverage of the intricacies of using the program. Encrypting, digital signatures, managing and certifying keys, and revoking keys are all covered. There is also a look into the muddy waters of privacy and public policy, info on the federal investigation of Phil Zimmerman, author of PGP, and an explanation of current export restrictions on cryptology technology. This book is ideal for those interested in using PGP, as well as those wishing to study cryptology issues as they relate to this software, which has proven to be an important and controversial step in the history of encryption. With a quickstart section, and a basic exploration of the background and history of encryption, this is also a good place for beginners to get started.