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Re: [tram] Stephen Farrell's Discuss on draft-ietf-tram-turn-third-party-authz-13: (with DISCUSS and COMMENT)

Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com> Wed, 22 April 2015 20:44 UTC

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Date: Wed, 22 Apr 2015 15:44:39 -0500
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From: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>
To: "Salz, Rich" <rsalz@akamai.com>
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Subject: Re: [tram] Stephen Farrell's Discuss on draft-ietf-tram-turn-third-party-authz-13: (with DISCUSS and COMMENT)
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Hi, Rich,

On Wed, Apr 22, 2015 at 12:13 PM, Salz, Rich <rsalz@akamai.com> wrote:

> > but could you explain to me (I'm thinking like a sentence, not like a
> thesis) on why those concerns don't apply?
>
> Sure.  First, look at https://tools.ietf.org/html/rfc6194#section-3  and
> quote that :)
>
> Second, this is not being used as a public signature mechanism, but as a
> private key for an HMAC.


That was my uninformed guess ... and I knew how uninformed it was.


> So you can't modify "original content" to find a collision since you don't
> have the content, and more importantly, you don't have the digest value for
> which the attacker is trying to find a collision.
>
> Hope that helps.
>

Extremely. My uninformed guess was a much less detailed version of that,
and the details are very helpful.

Thank you for investing a moment in helping to raise the average AD IQ!

Spencer

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