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Re: [saag] [IPsec] trapdoor'ed DH (and RFC-5114 again)

Yoav Nir <ynir.ietf@gmail.com> Tue, 18 October 2016 12:47 UTC

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From: Yoav Nir <ynir.ietf@gmail.com>
In-Reply-To: <alpine.LRH.2.20.1610171206070.827@bofh.nohats.ca>
Date: Tue, 18 Oct 2016 15:47:34 +0300
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References: <alpine.LRH.2.20.1610091711050.8864@bofh.nohats.ca> <D42AB86C.538C3%john.mattsson@ericsson.com> <CADZyTknqvF=zxW2thuN7mf_St2UmnWZzd8dVb5dWzDJ5=8tz5w@mail.gmail.com> <8C717FB2-DDC2-452E-AEC3-115B1E1397CF@gmail.com> <alpine.LRH.2.20.1610171206070.827@bofh.nohats.ca>
To: Paul Wouters <paul@nohats.ca>
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Cc: "ipsec@ietf.org WG" <ipsec@ietf.org>, Security Area Advisory Group <saag@ietf.org>
Subject: Re: [saag] [IPsec] trapdoor'ed DH (and RFC-5114 again)
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> On 17 Oct 2016, at 19:19, Paul Wouters <paul@nohats.ca> wrote:
> 
> On Mon, 17 Oct 2016, Yoav Nir wrote:
> 
>> I’m not entirely comfortable with calling something a MUST NOT when all we have is conjecture,
> 
> It's a little more than conjecture.
> 
> 1) It has been proven that malicious 1024 bit DH values can be generated
>   by academia that cannot be independantly discovered. Therefore any
>   nationstate with access to the same theory and more CPU power could
>   have done this years ago.

Someone can trapdoor 1024-bit values, therefore someone else can trapdoor 2048-bit values.

> 2) We have the RFC 5114 values who'se original authors/sponsors are not
>   disclosing how these were generated.
> 
> 1) + 2) means we cannot know if these values were trapdoor’ed.

Yeah, we cannot know. That’s why it’s conjecture.

Yoav

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