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From "Ben Laurie" <>
Subject Re: [OpenID] Announcing OpenID Authentication 2.0 - Implementor'sDraft 11
Date Mon, 22 Jan 2007 15:36:44 GMT
On 1/22/07, Hallam-Baker, Phillip <> wrote:
> > [] On Behalf Of Ben Laurie
> > More importantly, I think I have a solution that will make
> > both of us happy, but I now have to go and ride my motorbike
> > fast, so I'll detail it later.
> Now there is an exit line to tempt the Gods.
> The only way that I can see that you are going to circumvent an attempt using existing
browser capabilities is to introduce a malicious login page is through use of some form of
shared secret such as a picture of a cuddly animal chosen by the user or Secure Letterhead.

How is this kind of shared secret a defence against a MitM?

> Letterhead requires a browser upgrade so it breaks the 'existing capabilities' constraint.
> If you change the browser you might as well really change the browser and use a strong
authentication mechanism based on PKI

I'm sure you meant to say "based on asymmetric cryptography".

> I think we need to take another look at the 'change the browser' case and make sure that
we can take full advantage if the browser is changed.

Damn straight.

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