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Re: [quicwg/base-drafts] Change Packet Number Gap to Packet Number Offset (#1307)

Mike Bishop <notifications@github.com> Fri, 20 April 2018 17:22 UTC

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Date: Fri, 20 Apr 2018 17:22:23 +0000
From: Mike Bishop <notifications@github.com>
Reply-To: quicwg/base-drafts <reply+0166e4ab14947fcfd4908bb4769b25b0e7931bd436166f4b92cf0000000116f1e3cf92a169ce12d68139@reply.github.com>
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Subject: Re: [quicwg/base-drafts] Change Packet Number Gap to Packet Number Offset (#1307)
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> After CID update the AEAD keys must change, but then it is about time anyway.

Given how frequently CID rotation might occur (path validation, quiescence, shifts in wind direction), I am dubious that it's wise to rotate 1-RTT keys every time a new CID is used, which I believe is what you're saying here.  This also falls prey to the same problem as #1174 -- if you switched keys because you used a new CID to probe, what key do you use back on the original path while you wait for the probe to complete?  Key rotation is supposed to be a ratchet forward, and you can't have two key rotations going on at once in the current design, so you also can't take the answer of doing a second rotation on the original path.

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