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Re: [jose] JWK Thumbprint in JWS/JWE Header

Justin Richer <jricher@mit.edu> Tue, 19 July 2016 15:39 UTC

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From: Justin Richer <jricher@mit.edu>
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Date: Tue, 19 Jul 2016 11:24:17 -0400
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To: Nathaniel McCallum <npmccallum@redhat.com>
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Cc: jose@ietf.org
Subject: Re: [jose] JWK Thumbprint in JWS/JWE Header
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This was discussed on the list a while ago, and the thought was that you could easily use the JWK thumbprint *as* the “kid” value instead of defining a new field for this use case. The header values are protected by the signature in the normal (compact) JWS/JWE formats, and ought to be protected in the JSON representations too for exactly the reasons you’re talking about. 

 — Justin

> On Jul 19, 2016, at 10:48 AM, Nathaniel McCallum <npmccallum@redhat.com> wrote:
> 
> The JWS and JWE specs defined the "kid" header value that can be used
> to identify the key used for signing or encryption. Subsequently, the
> JWK thumbprint method was defined.
> 
> Has anyone put any thought into registering a header value for JWS and
> JWE headers that indicates the thumbprint of the key used for signing
> or encryption? This would be very helpful for key indexes especially
> when using unprotected headers since the value of "kid" might be
> modified.
> 
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> jose@ietf.org
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