GPG Information ?
GnuPG is the GNU Privacy Guard, which is a free (libre) replacement
for PGP, and is OpenPGP (RFC2440) compliant. You can check out the
GnuPG website for
more details.
It is a Public Key Infrastructure(PKI)-based authenticating and
encrypting system. You might already be familiar with ssh which
is also a PKI system that provides secure connections for file transfers and
login sessions.
Nutshell
In a nutshell, for authenticity, if I sign something with my private
key, you can verify the signature (and checksum of the object) with my
public key and rest assured it is definitely from me and unaltered.
For encryption, I encrypt an object with your public key, then only
you can decrypt it with your private key.
Distribution
There are key servers which contain many peoples' public key blocks.
These are their public keys along with a bunch of signatures of other people
who believe the key matches the real person they think it does. You can find my
public key at
pgp.mit.edu.
Integration
Some mail clients make use of GnuPG to decrypt and verify signed
emails. I use Mutt and
Evolution, both of which have integrated support. It looks
like Mozilla will make
use of S/MIME,
but there is the mozilla project
Enigmail to get GnuPG
working.
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.0.6 (SunOS)
Comment: For info see http://www.gnupg.org
mQGiBDy7N2kRBACUoR8WZTRSpirp0nx2wQG6IxZqqtRJUiA7050hwUUPG3bbdV1k
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3xvD7JJIAJ9vxSl7OPgRDvTxaMNWiJo1y0ZhZQ==
=wCwr
-----END PGP PUBLIC KEY BLOCK-----
