I use a pair of PGP keys. One is a long term signing key, which I use to authenticate a shorter lived key for everyday use. The signing key is:

pub   4096R/4EC16D6B 2004-10-27
      Key fingerprint = 3F69 2E64 6D92 3BBE E7AE  9258 5C0F 96E8 4EC1 6D6B
uid                  Jack Lloyd (Signing Key) <lloyd@randombit.net>

If you want to sign one of my keys, sign this one.

The other keypair is set with an expiration date, and usually lives for about two years. This key pair is signed by my long term signing key. If you wish to send me encrypted mail, use this key. Currently this key is:

pub   1024D/5AB21E5D 2009-04-13 [expires: 2011-04-13]
      Key fingerprint = 54DA CB97 D020 4769 B6C4  6724 E7CC CD1B 5AB2 1E5D
uid                  Jack Lloyd <lloyd@randombit.net>
sub   2048g/B8C531A0 2009-04-13 [expires: 2011-04-13]
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v2.0.10 (GNU/Linux)

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=xgYH
-----END PGP PUBLIC KEY BLOCK-----