Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as a RG document
Ilari Liusvaara <ilari.liusvaara@elisanet.fi> Mon, 05 January 2015 21:18 UTC
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Date: Mon, 05 Jan 2015 23:18:18 +0200
From: Ilari Liusvaara <ilari.liusvaara@elisanet.fi>
To: Adam Langley <agl@imperialviolet.org>
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Subject: Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as a RG document
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On Mon, Jan 05, 2015 at 11:49:47AM -0800, Adam Langley wrote: > On Mon, Jan 5, 2015 at 11:15 AM, Alexey Melnikov > <alexey.melnikov@isode.com> wrote: > > whether you want a particular change be made to the > > document before adoption. > > The structure of the current draft anticipates an additional curve and > also signature work so I'd like to point out a couple of changes to > save others having to do so: > > 1) If no other curves end up being recommended, then the current > generation process is overly complicated and could well be replaced > with a description that mirrors how curve25519 was actually chosen: > i.e. that the minimal sensible A value in Montgomery form be chosen. > It really depends on how important a generic procedure is seen to be. I think curve generation procedure should be there. > 2) The procedure for generating base points is currently unused and, > if change (1) is done, it could be tweaked to reflect how the > curve25519 base point was generated. Also, the past precent on base point generation on Edwards curves seems to be the least y, least x with big prime order. But the procedure here looks acceptable as well. > 3) If we don't end up saying anything about signatures, all mention of > Edwards curves could conceivably be dropped. Also, depending on exact signature scheme, having full isogeny/isomorphism chains to Weierstrass (these are easy enough to either find or derive, but still) and back (the dual isogeny for Edwards and Montgomery is more difficult to find) would be useful. Specifically, the place where that dual isogneny would be useful is if using ECDSA (yes, I know) with Weierstrass public keys. That would avoid implementing Weierstrass (which is somewhat annoying, even if doing public-only computations and having the field routines). -Ilari
- [Cfrg] Adoption of draft-agl-cfrgcurve-00 as a RG… Alexey Melnikov
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Adam Langley
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Stephen Farrell
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Watson Ladd
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Tony Arcieri
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Blumenthal, Uri - 0558 - MITLL
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Adam Langley
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Ilari Liusvaara
- [Cfrg] (please make draft an IETF document first)… Rene Struik
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Paul Lambert
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … David Leon Gil
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Michael Hamburg
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Alyssa Rowan
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Dan Brown
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … David Gil
- Re: [Cfrg] (please make draft an IETF document fi… Alexey Melnikov
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Sean Turner
- Re: [Cfrg] (please make draft an IETF document fi… Alexey Melnikov
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Watson Ladd
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Andrey Jivsov
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Adam Langley
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Andrey Jivsov
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Watson Ladd
- [Cfrg] options (was: Re: Adoption of draft-agl-cf… Stephen Farrell
- [Cfrg] No longer talking about Adoption of draft-… Alexey Melnikov
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Joppe Bos
- Re: [Cfrg] options (was: Re: Adoption of draft-ag… Paul Hoffman
- Re: [Cfrg] options Andrey Jivsov
- Re: [Cfrg] draft-agl-cfrgcurve-00 point format (w… Alyssa Rowan
- Re: [Cfrg] draft-agl-cfrgcurve-00 point format Andrey Jivsov
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Robert Ransom
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Ilari Liusvaara
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Robert Ransom
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Alexey Melnikov
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Alexey Melnikov
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Tony Arcieri
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Alexey Melnikov
- Re: [Cfrg] Adoption of draft-agl-cfrgcurve-00 as … Stephen Farrell
- [Cfrg] (technical flaws to be corrected in next v… Rene Struik
- Re: [Cfrg] (technical flaws to be corrected in ne… Adam Langley
- Re: [Cfrg] (technical flaws to be corrected in ne… Rene Struik
- Re: [Cfrg] (technical flaws to be corrected in ne… Adam Langley