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

Paul Wouters <paul@nohats.ca> Tue, 18 October 2016 14:38 UTC

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Date: Tue, 18 Oct 2016 10:38:52 -0400
From: Paul Wouters <paul@nohats.ca>
To: Yoav Nir <ynir.ietf@gmail.com>
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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 Tue, 18 Oct 2016, Yoav Nir wrote:

>> 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.

 	conjecture: 1. an opinion or conclusion formed on the basis of incomplete information.

I have complete information for "one cannot detect trapdoors without knowing seed"

Paul

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