Mark,
Now that I've reset the brain a bit:-)
Mark Delany wrote:
The gap created by the signer is the problem here so the rule needs to
be that a signer must sign from strongest to weakest, WITH NO GAPS.
The assumption that all signers and verifiers have the same idea of an
absolute strength-order for hash algorithms is a bit optimistic.
For example, some countries do insist on national algorithms being
supported - see rfc 4357 for example. I don't think I want to get into
a dispute about whether the Gost-hash is better or worse than sha-256
(or whatever) - do you?
Stephen.
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