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Re: I-D Action: draft-ietf-bfd-secure-sequence-numbers-13.txt

Alan DeKok <aland@freeradius.org> Mon, 05 February 2024 21:56 UTC

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Subject: Re: I-D Action: draft-ietf-bfd-secure-sequence-numbers-13.txt
From: Alan DeKok <aland@freeradius.org>
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Date: Mon, 05 Feb 2024 16:56:24 -0500
Cc: "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>, "draft-ietf-bfd-secure-sequence-numbers@ietf.org" <draft-ietf-bfd-secure-sequence-numbers@ietf.org>
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To: Reshad Rahman <reshad@yahoo.com>
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On Feb 5, 2024, at 4:50 PM, Reshad Rahman <reshad=40yahoo.com@dmarc.ietf.org> wrote:
> 
> Yes wikipedia links to https://eprint.iacr.org/2006/438.pdf

  Ah, OK.

  Unfortunately there's no source code, and no test vectors.  So I'm a bit wary of "rolling my own".  That being said, Page 5 has this text:

It is straightforward to distinguish between a real random bitstream and a one produced by ISAAC initialised with a state with constant value, since the latter shall have about half of the ωi equal to 2X. The full state can even be trivially recovered in a few seconds with a paper and a pen

  Which definitely sounds bad. :(

  I'll take a look at doing some tests with source code.

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