On 2 Nov 2017, at 11:04, Bob Harold <rharo...@umich.edu> wrote:

> I generally agree with you, but wonder if there is a performance penalty to 
> searching every possible path before failing.  Is that a reasonable concern?

I think there's a much bigger performance penalty from returning an error to an 
application and requiring an end-user to do something; the small delay 
introduced by validating a signature chain against a different trust anchor is 
likely smaller than that in the event that validation subsequently succeeds and 
irrelevant in the case that it fails.

I think that the performance angle, whilst always worth considering e.g. for 
impact on scaling properties, is a red herring in this particular case. I think 
the focus on what policy makes sense and where it should be applied is the 
right one.


Joe

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