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Re: [TLS] Confirming Consensus on removing RSA key Transport from TLS 1.3

Watson Ladd <watsonbladd@gmail.com> Tue, 06 May 2014 15:51 UTC

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References: <AD51D38F-2CFE-4277-854D-C0E56292A336@cisco.com> <277ABA2E-FA8C-4927-9522-06E8907C28EB@cisco.com> <CABcZeBOb-ym7+TrRmfasuyJJ6BVNbQB96jqqBOGZr+YPG-NBWA@mail.gmail.com> <1399274903.2312.6.camel@dhcp-2-127.brq.redhat.com> <20140505170029.GA24821@roeckx.be> <CABcZeBO_Yg+2UyvvDt7ah0gH7RFadAVt64M1ui1ok0+zNyg=iw@mail.gmail.com> <1399367598.30930.12.camel@dhcp-2-127.brq.redhat.com> <20140506152514.GY27883@mournblade.imrryr.org>
Date: Tue, 06 May 2014 08:51:33 -0700
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From: Watson Ladd <watsonbladd@gmail.com>
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Subject: Re: [TLS] Confirming Consensus on removing RSA key Transport from TLS 1.3
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On Tue, May 6, 2014 at 8:25 AM, Viktor Dukhovni
<viktor1dane@dukhovni.org> wrote:
> On Tue, May 06, 2014 at 11:13:18AM +0200, Nikos Mavrogiannopoulos wrote:
>
>> On Mon, 2014-05-05 at 10:23 -0700, Eric Rescorla wrote:
>> > You're probably thinking of:
>> > http://tools.ietf.org/html/draft-gillmor-tls-negotiated-dl-dhe-02
>>
>> > This seems like a reasonable kind of thing for the WG to
>> > consider,
>>
>> I believe that this draft addresses the existing concerns with the DH
>> ciphersuites I'm aware of, and would be very good if the TLS WG would
>> adopt it.
>
> Other collections of DHE groups work in a subgroup of order "q",
> where log(q) ~ 2^{security factor}.  This speeds up the arithmetic.
> (Squares can be reduced modulo the much smaller q).  Is there a
> reason to avoid those?  Problems with constant-time implementation?
> Other concerns?

How do you know I in fact gave you an element of that subgroup? The
obvious fixes are all very slow.
Sincerely,
Watson Ladd
>
> --
>         Viktor.
>
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