Re: bozoproofing the net, was The Value of Reputation

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>>>>> "John" == John Levine <johnl@xxxxxxxx> writes:

    >> Roughly we need to consider how DKIM is used, not just define a
    >> technology.  We need to talk about bad uses of DKIM as soon as
    >> we are aware that they are sufficinetly likely that they are
    >> worth considering.

    John> Here's a concrete suggestion: it is clear that the bad uses
    John> of DKIM people have mentioned are a subset of the bad uses
    John> of STARTTLS.

That's not clear to me.
I'd never really considered the question though so it may well be true.

    John> I have seen concerns that third party reputation lists might
    John> be used to create walled gardens or closed networks with
    John> DKIM.  This is not just a theoretical risk with STARTTLS.
    John> People have already done exactly that, since TLS unlike DKIM
    John> already includes the facilities for third parties to
    John> indicate which keys they like and which ones they don't.


Interesting I'll admit that I have not run into people who seem to
have a problem with a self-signed starttls cert in practice, although
I might not have noticed.  Also, I don't configure MTAs or my MUA to
offer a client cert, only a server cert.

I agree it is possible and am happy to take your word for it that someone has done so.

    John> And the TLS world is dominated by a single signer whose
    John> signing policies are opaque.

Really?  Are you sure the TLS world is not dominated by users clicking
OK trust this cert for anything they see, combined with a lot of self
signed certs and certs from a variety of CAs?  I do expect that most
web sites tend to have Verisign certs, but I have no idea about other
uses of TLS.

    John> So how about if we simply reuse the warning language about
    John> STARTTLS from RFC 3207?  

What warning language?  I can't find anything related to this problem.
I may not be looking carefully enough.


    John> If that's not adequate, do we need
    John> to write similar warnings about STARTTLS?

Quite possibly.


--Sam

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