>For existing algorithms, we could punt. Or introduce new aliases/numbers
>(which I know some folks don't like, though we've done that successfully
>with algs 6 and 7 for NSEC3), or target a future flag date for enforcement
>(and I know some folks hate flag days - Paul Wouters gave me a tshirt on
>that subject this week! :)

In my opinion the thing to do now is publish a BCP that signers have to 
avoid collisions (and other reasons for bad signatures)

That will have about the same effect (and with a lot less hassle) as issuing
new code points for existing algoritms.

We don't need a flag day. Validators can tolerate a few signature validation
errors. The main thing is that with a BCP it is clearly an error on the
side of the signer. Now it s something that is allowed by the protocol (and
even expected to some extent from naive signers).

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