On Thu, Feb 13, 2014 at 11:42 AM, Trevor Perrin <[email protected]> wrote:

>> Yet a fourth way is to observer that none of this affects interoperability 
>> in any way and leave it up to the UA vendor to choose their way. The web 
>> site operator should only include valid pins in their HPKP headers, and they 
>> should also enter only valid pins in pre-loaded lists. They should also deal 
>> with the fact that don't control usage patterns, so anytime they pin 
>> something for X seconds, their website MUST conform to that pin for at least 
>> those X seconds or bad things will happen.
>
> Your "fourth way" is well-put, and I agree - all of these seem valid
> implementations which should be allowed.

I have been thinking that this 4th way is the way to go. Note for
example that RFC 6797 (HSTS — which I would still like for HPKP to
emulate) does not even cover the topic.

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