“Point-and-Click E-Mail Crypto” was published in the January 2005 issue of Linux Journal.

KGPG and GPG: devel-home.kde.org/~kgpg

GnuPG Home Page: gnupg.org

Good Overview of GnuPG and a Section on Key Signing: www.linuxmafia.com/faq/Security/gnupg.html

Using GnuPG and How to Get It to Work on PGP 2.x Clients: www.queen.clara.net/pgp/art3.html

Using GnuPG with Older PGP (2.x) Clients: www.gnupg.org/gph/en/pgp2x.html

Overview of Cryptography and How Keys Work: www.pgpi.org/doc/pgpintro

Information about Various Encryption Algorithms: www.rsasecurity.com/rsalabs/node.asp?id=2212