Re: [Cfrg] Chopping out curves
Michael Hamburg <mike@shiftleft.org> Thu, 16 January 2014 21:54 UTC
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From: Michael Hamburg <mike@shiftleft.org>
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Date: Thu, 16 Jan 2014 13:53:51 -0800
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To: Trevor Perrin <trevp@trevp.net>
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Subject: Re: [Cfrg] Chopping out curves
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On Jan 16, 2014, at 1:50 PM, Trevor Perrin <trevp@trevp.net> 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). > > It takes a great deal of effort to do high-speed, const-time > implementations of a different curve, so we should not diffuse that > effort across too many choices. > > Note that Suite B only has 2 curves (P-256 and P-384). Yeah, I was going to protest: instead of using one stronger Montgomery curve and one Edwards, maybe we should use a Montgomery curve and a birationally equivalent (or at least isogenous) Edwards curve, or vice-versa. — Mike
- [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