:: PGP (Pretty Good Privacy)

PGP is a popular program used to encrypt and decrypt e-mail over the Internet. It can also be used to send an encrypted digital signature that lets the receiver verify the sender's identity and know that the message was not changed en route.

PGP is the most widely used privacy-ensuring program by individuals and is also used by many corporations. PGP has become a de facto standard for e-mail security. PGP can also be used to encrypt files being stored so that they are unreadable by other users or intruders.