[Cryptography] Size of the PGP userbase?

[Jon Callas]

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You should at the very least look at keyserver.pgp.com, which has very good numbers, because you have to re-verify your key there every six months or it gets deleted.

As Tamzen said, you're going to miss lots of keyservers that are domain-specific keyservers for all the people using PGP Universal (now known as Symantec Ecryption Server, because when you think of email encryption, you think of Symantec). You'll find those because they're (typically) using the hostname "keys.domain.tld" and have an LDAP server. I know there are several million users of that around the net.

	Jon


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