PGP 6.5.8 Pretty Good Privacy

Pretty Good Privacy (PGP) is a data encryption and decryption computer program that provides cryptographic privacy and authentication for data communication
http://en.wikipedia.org/wiki/Pretty_Good_Privacy

OpenPGP is a protocol for encrypting email using public key cryptography. It is based on PGP as originally developed by Phil Zimmermann.
http://www.openpgp.org/resources/faqs.shtml

http://blog.bonetree.net/2010/03/a-practical-guide-to-using-pgp-in-ubuntu-karmic-koala/

http://en.flossmanuals.net/basic-internet-security/ch030_installing-pgp-on-ubuntu/

http://www.gnupg.org/gph/en/manual.html#INTRO

Ubuntu Securely Send Information with PGP Encryption

http://ubuntuguide.org/wiki/Email_with_PGP

GnuPrivacyGuardHowto for ubuntu

The GNU Privacy Handbook

http://www.gnupg.org/gph/en/manual.html

http://www.pgpi.org/products/pgp/versions/freeware/unix/6.5.8/

• Introduction: A word about PGP
• Before you begin
• Step 1: Downloading PGP
• While you're maybe waiting.... Where did PGP come from and how does it work?
• Step 2: Unzipping and installing the PGP software
• Step 3: Setting up (Creating) your Public and Private PGP keys
• Step 4: Changing your Passphrase
• Step 5: Distributing your Public Key
• Step 6: Making your Public Key available through a certificate server
• Step 7: Obtaining and Adding someone else's Public Key to your keyring
• Step 8: Using the PGP encryption software to send and receive secure e-mails
• Step 9: Using your Default Public Key to save a backup, encrypted, decipherable copy of all your e-mail messages
• Step 10: PGP Signing your own unencrypted e-mails
• Step 11: Weaving the Web of Trust--Signing someone else's Public Key
• Step 12: Using the PGP encryption software to protect (encrypt) your personal documents
• Step 13: Using PGP to Wipe files from your disks
• Step 14: Useful PGP Options you should know about