By (author unknown), Irongeek's Security Site – January 14, 2008 at 12:56AM
New Video:Using GPG/PGP/FireGPG to Encrypt and Sign Email from Gmail
This tutorial will show how to use GPG and the FireGPG plug-in to encrypt and
decrypt messages in Gmail. GPG is an open source implementation of OpenPGP
(Pretty Good Privacy) , a public-key-encryption system. With public key
encryption you don’t have to give away the secret key that decrypts data for
people to be able to send you messages. All senders need is the public key which can only be used to encrypt, this way the secret key never has to be sent across unsecured channels.