Re: [Cfrg] Chopping out curves
Watson Ladd <watsonbladd@gmail.com> Fri, 17 January 2014 02:47 UTC
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Date: Thu, 16 Jan 2014 18:47:19 -0800
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From: Watson Ladd <watsonbladd@gmail.com>
To: Adam Back <adam@cypherspace.org>
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Cc: Trevor Perrin <trevp@trevp.net>, "cfrg@irtf.org" <cfrg@irtf.org>
Subject: Re: [Cfrg] Chopping out curves
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On Thu, Jan 16, 2014 at 6:36 PM, Adam Back <adam@cypherspace.org> wrote: > Uh I meant the Curve25519 and Curve3617. Sorry about that (again conflating > safe curves and the Bernstein/Lange curves by the same authors.) It would, but Curve25519 is a Montgomery curve and so we want an Edwards curve for easy signatures. T25519 should be the same curve, in a different form (if I didn't screw up my basepoint choice, which I probably did. This weekend I will do a good computer search). Curve3617 has a nice Montgomery curve we should describe for safe ECDH. I feel like I'm coming around to Robert Ransoms arguments about how to pick curves. > > Adam > > > On Fri, Jan 17, 2014 at 02:14:14AM +0100, Adam Back wrote: >> >> Woulnt it make more sense to use two safe curve curves as they seem to be >> what people are using and better tested/reviewed (re goldilocks). >> >> Adam >> >> On Thu, Jan 16, 2014 at 02:36:24PM -0800, Watson Ladd wrote: >>> >>> On Thu, Jan 16, 2014 at 2:07 PM, Dan Harkins <dharkins@lounge.org> wrote: >>>> >>>> On Thu, January 16, 2014 1:50 pm, Trevor Perrin wrote: >>>>> >>>>> On Thu, Jan 16, 2014 at 1:40 PM, Watson Ladd <watsonbladd@gmail.com> >>>>> wrote: >>>>>> >>>>>> Dear all, >>>>>> Trevor Perrin suggests that we only put in Curve25519/T25519 and >>>>>> E383/M382 so implementors can focus on 4 curves ala Suite B. Are there >>>>>> any protocols in which larger curves would be useful? Anything we >>>>>> might be missing with this decision? >>>>> >>>>> >>>>> I didn't quite suggest that. >>>>> >>>>> I do feel there should be fewer curves. Perhaps only curve25519 and >>>>> (either Curve3617 or Ed448-Goldilocks). >>>>> > -- "Those who would give up Essential Liberty to purchase a little Temporary Safety deserve neither Liberty nor Safety." -- Benjamin Franklin
- [Cfrg] Chopping out curves Watson Ladd
- Re: [Cfrg] Chopping out curves Trevor Perrin
- Re: [Cfrg] Chopping out curves Michael Hamburg
- Re: [Cfrg] Chopping out curves Dan Harkins
- Re: [Cfrg] Chopping out curves Watson Ladd
- Re: [Cfrg] Chopping out curves Michael Hamburg
- Re: [Cfrg] Chopping out curves Adam Back
- Re: [Cfrg] Chopping out curves Adam Back
- Re: [Cfrg] Chopping out curves Watson Ladd
- Re: [Cfrg] Chopping out curves Alyssa Rowan
- Re: [Cfrg] Chopping out curves David McGrew
- Re: [Cfrg] Chopping out curves Adam Back
- Re: [Cfrg] Chopping out curves Alyssa Rowan
- Re: [Cfrg] Chopping out curves Robert Ransom
- Re: [Cfrg] Chopping out curves Watson Ladd
- Re: [Cfrg] Chopping out curves Manuel Pégourié-Gonnard
- Re: [Cfrg] Chopping out curves Alyssa Rowan
- Re: [Cfrg] Chopping out curves Watson Ladd
- Re: [Cfrg] Chopping out curves Igoe, Kevin M.
- Re: [Cfrg] Chopping out curves Manuel Pégourié-Gonnard
- Re: [Cfrg] Chopping out curves Watson Ladd
- Re: [Cfrg] Chopping out curves Mike Hamburg
- Re: [Cfrg] Chopping out curves Manuel Pégourié-Gonnard
- Re: [Cfrg] Chopping out curves Jon Callas