Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG document
Paul Lambert <paul@marvell.com> Thu, 22 January 2015 19:59 UTC
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From: Paul Lambert <paul@marvell.com>
To: Adam Langley <agl@imperialviolet.org>, "Dearlove, Christopher (UK)" <chris.dearlove@baesystems.com>
Date: Thu, 22 Jan 2015 11:59:01 -0800
Thread-Topic: [Cfrg] Adoption of draft-ladd-spake2 as a RG document
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Subject: Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG document
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On 1/22/15, 11:35 AM, "Adam Langley" <agl@imperialviolet.org> wrote: >On Mon, Jan 19, 2015 at 3:56 AM, Dearlove, Christopher (UK) ><chris.dearlove@baesystems.com> wrote: >> A minor point compared to choice of curve. Commenting on draft >>draft-agl-cfrgcurve-00, it indicates, in section 8 the use of >>little-endian order. RFC 5480 (obvious prior art in IETF) does not >>appear to specify big/little endianness, but delegates that to its >>reference SEC1. That document (http://www.secg.org/sec1-v2.pdf) in >>section 2.3.7 reverses the order of its x and M coefficients to produce >>a big-endian representation of an integer. Big endian format is also >>used by, for example, OpenSSL. Is the use of little endian format here a >>deliberate design decision? > >(This appears to be a comment on draft-agl-cfrgcurve-00, but this >thread is otherwise about draft-ladd-spake2 which is why I didn't >notice it.) > >Yes, the use of little-endian is a deliberate decision. It reflects >unanimous practice with the recommended curve. Also, I think there's a >general movement towards having crypto primitives specified as >functions on bytes strings rather than on more abstract concepts like >points (which I support). +1 Yes, given the diversity of uses, protocols and formats. Opaque encodings make the most sense. The encoding/decoding would be a method tied to the specific algorithm/protocol/cipher suite. Paul > > >Cheers > >AGL > >-- >Adam Langley agl@imperialviolet.org https://www.imperialviolet.org > >_______________________________________________ >Cfrg mailing list >Cfrg@irtf.org >http://www.irtf.org/mailman/listinfo/cfrg
- [Cfrg] Adoption of draft-ladd-spake2 as a RG docu… Alexey Melnikov
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Rene Struik
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Watson Ladd
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Watson Ladd
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … David Leon Gil
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Alexey Melnikov
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Yoav Nir
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Alexey Melnikov
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Stephen Farrell
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Michael Hamburg
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Dan Harkins
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Watson Ladd
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Dan Harkins
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Derek Atkins
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Dan Harkins
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Andy Lutomirski
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Paul Lambert
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Watson Ladd
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Alexey Melnikov
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Alexey Melnikov
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Dan Harkins
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Paul Lambert
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Tom Yu
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Andy Lutomirski
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Dearlove, Christopher (UK)
- Re: [Cfrg] Point format endian (was: Adoption of … Alyssa Rowan
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Alexey Melnikov
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Adam Langley
- Re: [Cfrg] Adoption of draft-ladd-spake2 as a RG … Paul Lambert
- [Cfrg] On the topic of the SPAKE2 draft Paul Lambert
- Re: [Cfrg] Point format endian (was: Adoption of … Dan Harkins
- Re: [Cfrg] Point format endian (was: Adoption of … Watson Ladd
- Re: [Cfrg] Point format endian (was: Adoption of … Salz, Rich
- Re: [Cfrg] Point format endian (was: Adoption of … Dan Harkins
- Re: [Cfrg] Point format endian (was: Adoption of … Watson Ladd
- Re: [Cfrg] Point format endian (was: Adoption of … D. J. Bernstein
- Re: [Cfrg] Point format endian (was: Adoption of … Dan Harkins
- Re: [Cfrg] Point format endian (was: Adoption of … Mike Hamburg
- Re: [Cfrg] Point format endian (was: Adoption of … Salz, Rich
- Re: [Cfrg] Point format endian (was: Adoption of … Watson Ladd
- Re: [Cfrg] Point format endian (was: Adoption of … Andrey Jivsov
- Re: [Cfrg] Point format endian Alyssa Rowan
- Re: [Cfrg] Point format endian (was: Adoption of … Salz, Rich
- Re: [Cfrg] Point format endian (was: Adoption of … Damien Miller
- Re: [Cfrg] Point format endian (was: Adoption of … Dan Harkins
- Re: [Cfrg] Point format endian (was: Adoption of … Mike Hamburg
- Re: [Cfrg] Point format endian (was: Adoption of … Watson Ladd
- Re: [Cfrg] Point format endian (was: Adoption of … Yoav Nir
- Re: [Cfrg] Point format endian Michael Clark