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Re: [babel] Some open HMAC issues

David Schinazi <dschinazi@apple.com> Mon, 02 July 2018 17:41 UTC

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From: David Schinazi <dschinazi@apple.com>
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Date: Mon, 02 Jul 2018 10:41:50 -0700
In-reply-to: <87a7r9imhy.fsf@toke.dk>
Cc: Juliusz Chroboczek <jch@irif.fr>, Weronika Kołodziejak <weronika.kolodziejak@gmail.com>, Clara Dô <clarado_perso@yahoo.fr>, babel@ietf.org
To: Toke Høiland-Jørgensen <toke@toke.dk>
References: <87sh545st3.wl-jch@irif.fr> <411E2C9F-A910-4899-8DD7-92C0C85EBC54@apple.com> <87sh523xy8.wl-jch@irif.fr> <7E5E0D4C-0049-47D1-ACFA-31EA0F843237@apple.com> <87d0w5ingo.fsf@toke.dk> <375EE128-E5F3-487C-9A9E-89A8C976489F@apple.com> <87a7r9imhy.fsf@toke.dk>
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Subject: Re: [babel] Some open HMAC issues
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> On Jul 2, 2018, at 10:19, Toke Høiland-Jørgensen <toke@toke.dk> wrote:
> 
> Hmm, I'm not sure that I am convinced that it is worth the tradeoff to
> add the key ID. But assuming it is: Is there any reason why this ID
> needs to be user configured? We could just define it as a 16-bit
> truncated hash of the key itself, or something like that?

I like this idea, but we'd have to be careful to not open up offline
attacks this way.

David

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