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Re: [rtcweb] A couple of questions on SDP Identity attribute

Christer Holmberg <christer.holmberg@ericsson.com> Thu, 11 October 2018 11:27 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Harald Alvestrand <harald@alvestrand.no>, "rtcweb@ietf.org" <rtcweb@ietf.org>
Thread-Topic: [rtcweb] A couple of questions on SDP Identity attribute
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Date: Thu, 11 Oct 2018 11:27:06 +0000
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Subject: Re: [rtcweb] A couple of questions on SDP Identity attribute
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Hi,

    >> Q1: In an offer or answer, it allowed to include fingerprints that have
    >> NOT been used to assert the identity?
    >
    > I don't understand the question..... if you don't assert an identity,
    > there are of course fingerprints that have not been used to assert the
    > identity.
    >
    > Was the question about the case where you include an identity attribute?
    
    Yes.

    >> Q2: If one or more of the fingerprints used to assert the identity
    >> change, I assume that the Identity attribute value will always changes a
    >> result? Or, is there a chance that different fingerprints would produce
    >> the same Identity attribute value?
    >
    > A fingerprint can't really "change".
    > There may be new fingerprints because of new hash functions added
    > (though that would be strange over the time of a call), or because new
    > certificates were added to the session.
    
    Correct.

    Regards,

    Christer

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