> Ken Goldman wrote:
> > All correct for authentication.  There are times that public keys or
> > certificates are encrypted using a DH protocol for privacy.  You might
> > not want a man in the middle to track where you go, and a certificate
> > is your identity.
> > 
> 
> That's somewhat of an oversimplification I believe. Diffie-Hellman is a
> key-exchange protocol, not an encryption protocol. If we're helping this
> chap understand certs a little better let's not confuse him
> inordinately! ;-)

The result of DH is a shared secret.  As I understand it, IPsec
uses it as a symmetric key for encryption, so that the remainder of
the authentication protocol remains private.

-- 
Ken Goldman   [EMAIL PROTECTED]   914-784-7646
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