Re: [Cfrg] A draft merging rpgecc and thecurve25519function.
Alexey Melnikov <alexey.melnikov@isode.com> Mon, 05 January 2015 18:38 UTC
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Date: Mon, 05 Jan 2015 18:38:04 +0000
From: Alexey Melnikov <alexey.melnikov@isode.com>
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To: Adam Langley <agl@imperialviolet.org>, Watson Ladd <watsonbladd@gmail.com>
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Subject: Re: [Cfrg] A draft merging rpgecc and thecurve25519function.
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On 02/01/2015 01:16, Adam Langley wrote: > On Thu, Jan 1, 2015 at 4:51 PM, Adam Langley <agl@imperialviolet.org> wrote: >> However, I don't agree that the algorithm is simply ignored. It's >> clearly important to some that the generation algorithm be explicit >> and transparent. Yes, it's odd that at the end we have to do an >> arbitrary isogeny but I think the motivation for that is clear and >> it's a "safe" step (i.e. we can't have hidden anything dodgy in there >> to my knowledge.) >> >> The algorithm could be written to reflect how curve25519 was >> developed: i.e. that it output a Montgomery curve and then the twisted >> Edwards is the obvious isomorphism from there (if needed). That might >> well be clearer if we don't recommend any other curves. >> >> But dealing with Edwards curves and having the algorithm generate them >> makes it easier if we recommend another, or in the optimistic scenario >> that we also end up specifying a signature scheme. > I think I've fallen into the "details" trap in that reply. > > However the generation is structured to make it most clear, and > whether or not we mention (twisted) Edwards curves, I think that the > important point is this: > > Unless the chairs believe, and state within weeks, that we can move > forward with something shaped like this draft (whether it's based on > it or not) Chairs believe that your draft is a very reasonable compromise (in IETF sense, not in security sense) between technically sound proposals and will initiate Last Call on acceptance of your document as a starting point for CFRG document shortly. > then I don't think that this RG will be able to recommend > any specific curves. I don't think anything will be more generally > agreeable. Agreed. > If we can't recommend curves then the best that we might be able to do > is to put out a document that states the requirements for safe > elliptic curves and mentions that curve25519, curve25519-isogeny, > 41417, Goldilocks, E-521, etc are all fine, cryptographically. Then > other WGs will have to do the picking. Indeed. This outcome would be suboptimal (IMHO), but still a bit better than "no consensus on anything in CFRG".
- [Cfrg] A draft merging rpgecc and thecurve25519fu… Adam Langley
- Re: [Cfrg] A draft merging rpgecc and thecurve255… Adam Langley
- Re: [Cfrg] A draft merging rpgecc and thecurve255… Watson Ladd
- Re: [Cfrg] A draft merging rpgecc and thecurve255… Adam Langley
- Re: [Cfrg] A draft merging rpgecc and thecurve255… Adam Langley
- [Cfrg] Wanting a signature scheme, not needing it… Paul Hoffman
- Re: [Cfrg] A draft merging rpgecc and thecurve255… Mike Hamburg
- Re: [Cfrg] A draft merging rpgecc and thecurve255… Brian Smith
- Re: [Cfrg] A draft merging rpgecc and thecurve255… David Rufino
- Re: [Cfrg] A draft merging rpgecc and thecurve255… Stephen Farrell
- Re: [Cfrg] A draft merging rpgecc and thecurve255… Tanja Lange
- Re: [Cfrg] A draft merging rpgecc and thecurve255… David Rufino
- Re: [Cfrg] A draft merging rpgecc and thecurve255… Alexey Melnikov