Global Internet Trust Register
- A register of the key fingerprints of the world's most important public keys. Useful as part of the process of verifying public keys (should be used in combination with other techniques too).
- http://www.cl.cam.ac.uk/Research/Security/Trust-Register/

OpenPGP Public Key Server
- PGP and PKI Public Certificate Server for all domains. Site content provides software downloads, configuration instructions for ldap.
- http://www.pgp.keyserver.ca/

CryptNET Public Key Server
- A publicly accessible openPGP compliant public key server.
- http://keyserver.cryptnet.net/

The WWW Based Key Server System
- Get PGP keys through a web interface.
- http://www.pgp.net/pgpnet/www-key.html