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Re: [Cfrg] General question about ECC encryption

Nex6 <n6ghost@yahoo.com> Sun, 01 April 2018 04:42 UTC

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From: Nex6 <n6ghost@yahoo.com>
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Date: Sat, 31 Mar 2018 21:38:44 -0700
In-Reply-To: <CAHOTMV+YhsYzz2sx7qK+Hj3f8Qc7gM4UPa_-Rnzb-8nsk9OAoQ@mail.gmail.com>
Cc: Travis Finkenauer <tmfink@juniper.net>, "cfrg@irtf.org" <cfrg@irtf.org>
To: Tony Arcieri <bascule@gmail.com>
References: <68CDF9F6-11D1-45D7-8FF6-80C619893E27@gmail.com> <DC64405B-1D92-457B-B179-92E010A8B0F2@juniper.net> <CAHOTMV+YhsYzz2sx7qK+Hj3f8Qc7gM4UPa_-Rnzb-8nsk9OAoQ@mail.gmail.com>
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Subject: Re: [Cfrg] General question about ECC encryption
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very good points below, another link for me to digest. thanks

> On Mar 30, 2018, at 11:18 AM, Tony Arcieri <bascule@gmail.com> wrote:
> 
> On Fri, Mar 30, 2018 at 10:47 AM, Travis Finkenauer <tmfink@juniper.net <mailto:tmfink@juniper.net>> wrote:
> Is your coworker conflating any ECC and the Dual_EC_DRBG?
> 
> There are also concerns about the domain parameters of the NIST curves, most notably the choice of "b" (in short Weierstrass form) as the SHA-1 digest of a seed value, whose origins are not stated or justified. (Note: my personal opinion is it is unlikely that these values have been chosen in such a way that they have any material impact on the security of the NIST curves)
> 
> The elliptic curves selected by the CFRG, on the other hand, do not have mystery constants of unknown origin, but instead deterministically generate all relevant domain parameters according to a set of rigid curve selection guidelines. You can read about these guidelines in Appendix A of RFC 7748:
> 
> https://tools.ietf.org/html/rfc7748#appendix-A <https://tools.ietf.org/html/rfc7748#appendix-A>
> 
> -- 
> Tony Arcieri
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