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Re: tlsverifyclient security implications

On Mon, 24 Aug 2009, Emmanuel Dreyfus wrote:
> Howard Chu <hyc@symas.com> wrote:
> > But certificates are not a required element for encryption of a 
> > connection - after all, TLS also supports anonymous Diffie-Hellman key 
> > exchange.
> Sure, but encryption without authentication makes little sense, as you 
> don't know who you are securely speaking to: you can get an encrypted 
> link to a man in the middle.

Heh, I have this vision of libldap changing the default cipher suite based 
on the TLS_VERIFY setting, such that any setting that doesn't do complete 
validation of certs would have the library prefer to use an anonymous 
cipher suite instead.

"You're not actually protecting yourself against MitM attacks, so we're 
enabling the lower-latency anonymous suites."

(...at least my memory is that the ADH handshake is cheaper than the RSA 

Philip Guenther