I reviewed this draft (“browsed through” would be a more honest statement). I 
didn’t spot an obvious problem with it.

One question that I have after reading it: I understand why one wants to 
implement this extension, but I don’t see how the two endpoints would arrive at 
that external PSK.

From: TLS <[email protected]> on behalf of Russ Housley 
<[email protected]>
Date: Monday, May 20, 2019 at 3:21 PM
To: Joe Salowey <[email protected]>
Cc: IETF TLS <[email protected]>
Subject: Re: [TLS] WGLC for draft-ietf-tls-tls13-cert-with-extern-psk

TLS 1.3 Extension for Certificate-based Authentication with an External PSK 
ensures the US Government has a quantum-resistant option for TLS in the interim 
years until post-quantum algorithms emerge from the NIST process. For this 
reason, there is an intent to specify this extension in future procurements.

Russ



On May 15, 2019, at 9:20 AM, Joseph Salowey 
<[email protected]<mailto:[email protected]>> wrote:

The last call has come and gone without any comment.  Please indicate if you 
have reviewed the draft even if you do not have issues to raise so the chairs 
can see who has reviewed it.  Also indicate if you have any plans to implement 
the draft.

On Tue, Apr 9, 2019 at 8:51 PM Joseph Salowey 
<[email protected]<mailto:[email protected]>> wrote:
This is the working group last call for the "TLS 1.3 Extension for 
Certificate-based Authentication with an External Pre-Shared Key” draft 
available at 
https://datatracker.ietf.org/doc/draft-ietf-tls-tls13-cert-with-extern-psk/. 
Please review the document and send your comments to the list by 2359 UTC on 23 
April 2019.

Thanks,
Chris, Joe, and Sean


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