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Global Internet Trust Register - http://www.cl.cam.ac.uk/Research/Security/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).
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The WWW Based Key Server System - http://www.pgp.net/pgpnet/www-key.html
Get PGP keys through a web interface.
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CryptNET Public Key Server - http://keyserver.cryptnet.net/
A publicly accessible openPGP compliant public key server.
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