Re: [quicwg/base-drafts] What's a short period? (#2172)

hardie <notifications@github.com> Mon, 17 December 2018 19:53 UTC

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Subject: Re: [quicwg/base-drafts] What's a short period? (#2172)
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On Thu, Dec 13, 2018 at 4:18 PM ekr <notifications@github.com> wrote:

> An endpoint SHOULD retain old keys for a short period to allow it to decrypt
> packets with smaller packet numbers than the packet that triggered the key
> update.  This allows an endpoint to consume packets that are reordered around
> the transition between keys.  Packets with higher packet numbers always use the
> updated keys and MUST NOT be decrypted with old keys.
>
> If you are going to have a 2119 SHOULD here, I think you need to explain
> what a short period is
>
> 2 RTT?  Just throwing out a theory, but it seems like packets that aren't
decryptable after that would have the data re-transmitted anyway.


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