"Mark Godden's Little Bit Of Cyberspace Mk.II"
Internet Cryptography & Security
-----BEGIN
PGP SIGNED MESSAGE-----
Hash: SHA1
Pretty Good Privacy (PGP) is a strong encryption program, written by American, Phil Zimmermann, which uses a public/private key pair to strongly encrypt files and emails. Since its initial development in the late 1980s and its subsequent release onto the Internet, numerous, increasingly refined versions of PGP have been developed by various programmers from many parts of the World, all of them built upon the common foundation of Zimmermann's original and freely available source code. Anyone wishing learn about strong cryptography and download free cryptographic software should perhaps start by visiting the international PGP Website at www.pgpi.com.
A free and open European version of PGP called GnuPG is available from www.gnupg.org this does not use the patented "IDEA" algorithm and therefore can be used without any of the copyright and export restrictions affecting the American versions of PGP. Favoured my many users, GnuPG is a multi-platform, command line program, written by German, Werner Koch, that is partially compatible with PGP.
It is widely believed that the security offered PGP and GnuPG has to date, not been compromised, but its worth bearing in mind that if someone who wanted access to your emails had actually managed to crack your encryption, they are hardly likely to tell you about it!
Although in practice I rarely encrypt my emails, I value the knowledge that I could if I wanted to. The same is true for anyone wishing to securely communicate with me. My GnuPG and PGP public keys are published below, these can be used by anyone who has either PGP or GnuPG installed on their computer, to encrypt emails for me, that only I can open.
In addition to straightforward encryption PGP and GnuPG can perform other security tasks such as "signing" unencrypted text, as I have done with the body of text on this page. This means that anyone possessing my public key can, using the signature information shown below, verify that it was me, and not someone impersonating me, who actually wrote the text.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.0 (MingW32) - WinPT 0.7.92-cvs
iD8DBQE94M99S0jjzaVr23ARAspCAJ9xmqro3/QW4MOIeF/asm4FKZAGHgCfeYpv
1PoJhKvWPeGHqfJaP4FJn3o=
=SnHS
-----END PGP SIGNATURE-----
Below, as an example of a cyphertext, are the five paragraphs of plaintext from above, encyypted and digitally signed, using my GnuPG public key (available below):
-----BEGIN
PGP MESSAGE-----
Version: GnuPG v1.2.0 (MingW32) - WinPT 0.7.92-cvs
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=PoJl
-----END PGP MESSAGE-----
The above cyphertext can only
be converted back into plaintext by me using my private key and
my password.
Anyone from anywhere in the world, who is connected to the Web, can, if they wish, download a freely available copy of PGP or GnuPG (via The International PGP Website ) and use one of my public keys (published below) to strongly encrypt any text, and send it via email, safe in the knowledge that only I can unencrypt and read it. This is a very powerful facility indeed, which puts private and secure international communication (believed to be beyond the combined efforts of the World's best cryptoanalysts) in the hands of individual citizens of the World.
Mark's GnuPG key's fingerprint: 442E 0658 C55B 9CFD B25B 3A1F 4B48 E3CD A56B DB70
Mark's GnuPG key:
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.0.6 (MingW32)
Comment: For info see http://www.gnupg.org
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=3UOU
-----END PGP PUBLIC KEY BLOCK-----Download Mark's GnuPG public key as a file
Mark's PGP key's fingerprint: EC62 7ECA DC47 DBC9 AF03 70BF B157 919C 316D D440
Mark's PGP key:-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: PGPfreeware 7.0.3 for non-commercial use <http://www.pgp.com>
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=m2rM
-----END PGP PUBLIC KEY BLOCK-----Download Mark's PGP public key as a file
Other crypto and privacy related Sites:
www.epic.org - Electronic privacy information centre.
www.eff.org - Electronic frontier foundation.
www.privacy.org - The privacy page.
www.crypto.org - Internet privacy coalition.