Re: [Cfrg] Call for adoption: Threshold Signatures

Christopher Wood <caw@heapingbits.net> Wed, 28 October 2020 19:57 UTC

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Date: Wed, 28 Oct 2020 12:55:49 -0700
From: "Christopher Wood" <caw@heapingbits.net>
To: "Nick Sullivan" <nick=40cloudflare.com@dmarc.ietf.org>, cfrg@irtf.org
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Subject: Re: [Cfrg] Call for adoption: Threshold Signatures
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On Thu, Oct 8, 2020, at 9:33 AM, Nick Sullivan wrote:
> a) should this topic be adopted by the CFRG as a work item, and if so

Yes. There are many emerging use cases for threshold signatures, as evidenced by the NIST effort, and I think it'd be useful for CFRG to complement RFC8032 with this functionality. 

> b) should one or both of these documents should be considered as a starting point for this work

Probably only one. The structure of draft-hallambaker-threshold-sigs as an extension to RFC8032 is attractive, though I think draft-komlo-frost (and the related paper) is generally a better starting point, especially given its assessment of attacks on related schemes such as 2020/945. It also seems to have plenty of backing implementations and reviews. If we can specialize it to RFC8032, perhaps with Richard's work as the basis for that change, then I prefer FROST.

> c) are you willing to help work on this item and/or review it

Yes to both.

Best,
Chris