Re: [sidr] WGLC for draft-ietf-sidr-algorithm-agility-03

Sean Turner <turners@ieca.com> Fri, 18 November 2011 07:34 UTC

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Date: Fri, 18 Nov 2011 15:34:21 +0800
From: Sean Turner <turners@ieca.com>
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Subject: Re: [sidr] WGLC for draft-ietf-sidr-algorithm-agility-03
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On 11/18/11 2:21 PM, Christopher Morrow wrote:
> On Thu, Nov 17, 2011 at 12:50 PM, Brian Dickson
> <brian.peter.dickson@gmail.com>  wrote:
>
>> Here's the thing - if all-A chains continue to exist until Phase 4,
>> _and_ fallback to Suite A is required, this is a downgrade-attack
>> vulnerability.
>>
>
> It seems to me that as long as there are consumers of cert material
> that can not do the 'new hotness' (B in your example) you will have to
> make products in the 'old and busted' form. Once everyone can do 'new
> hotness', there is a relatively short period of time required to kill
> off 'old and busted'.
>
> I don't think you can get away with not making 'old and busted' until
> everyone is able to plan ball, eh?

Hope of hopes here is that we don't just transition when an alg is 
broke.  Algs weaken over time - that's just a fact.  When we retire an 
alg because it doesn't cut it anymore, then running with the old 
unbroken alg is a downgrade but assuming the alg ain't broke then it's 
probably okay for the transition period.

spt