Re: [P1363:] 1363.3: Using generalized schemes / choice of pairings
Hi William,
I think the issue is very important. For example some schemes may
require XDDH assumptions (which require assymetric pairings a la
the Ate pairing), others become very very efficient when instantiated
in certain ways (e.g. CKS ID-Key Agreement, when using the "inverse"
of the BF keys in the Type III setting).
In general not to support sextic twisted curves with the Ate-pairing,
which provide efficient pairings and fast operations in G_2, when neither
technique is patented would be a crying shame for 1363.3. As it stands
you talk about sextic twisted curves in one part, but then the schemes
dont really support them.
The generalisation is quite easy to do, and could be easily supported
by an "implementation" section which explains what to do. If you want I
could go through the word document for you and make the changes needed
(with change tracking on), so that you and Luther can see what is
needed in the protocols bit. Who is doing the implementation section
BTW, that looks a bigger job to me.
Cheers
Nigel
Whyte, William wrote:
Hi List,
One of Nigel Smart's comments was that the schemes in 1363.3
should be generalized to allow a choice of pairings. Any thoughts
about this? I've heard off-list that the BF proposers don't think
this is valuable to them, but off-list conversations aren't
definitive.
* Does it make sense for all schemes?
* Does it make sense for some schemes only?
* Is it too early in the use of IBE to start standardizing
different pairings, and should we focus on a single
interoperable specification?
Cheers,
William
=========================================
William Whyte,
Chair, IEEE P1363 Working Group
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Prof. Nigel P. Smart | Phone: +44 (0)117 954 5163
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