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Re: sniffing plaintext protocols
From: "itsec.info" <itsec.info () gmail com>
Date: Fri, 11 Aug 2006 18:19:38 +0200

On Friday 11 August 2006 07:34, Tonnerre Lombard wrote:
While this discussion doesn't quite seem to match the list subject, I
have something to say here.
It is welcome when the topic evolves!

On Thu, 2006-08-10 at 10:27 -0700, Gary E. Miller wrote:
Most modern pop3 and imap clients and servers support TLS.  That
protentially gives you a certificate protected channel between the client
and server.

A nice setup is dovecot server and thunderbird client using all TLS.

This doesn't protect your mail at all if one of the mail servers
underway demands to receive the mail unencrypted, which a lot of mail
servers still do these days. 
Hopefully these emails can not be de-crypted on the fly.

Even worse, this gives anyone with the 
desire to crack your local TLS certificate for pop3s/imaps a huge
opportunity for a known plaintext attack.
I do not get this point.

The only real way to secure the contents (not the sender and
receipient!) of your mail is to use PGP encryption on it. If you want to
hide the metadata (who sent mail to who and about what) as well, you'll
have to go for mixes, but they're pretty uneasy to get right...
Well pgp does address another area compared to TLS or pop3s. On the other hand 
I agree to combine both!


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