Re: [quicwg/base-drafts] RETIRE_KEYS proposal (#2492)

Martin Thomson <> Fri, 01 March 2019 03:37 UTC

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From: Martin Thomson <>
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Subject: Re: [quicwg/base-drafts] RETIRE_KEYS proposal (#2492)
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martinthomson commented on this pull request.

>  Though an endpoint might retain older keys, new data MUST be sent at the highest
 currently-available encryption level.  Only ACK frames and retransmissions of
 data in CRYPTO frames are sent at a previous encryption level.  These packets
 MAY also include PADDING frames.
-Once this timer expires, an endpoint MUST NOT either accept or generate new
-packets using those packet protection keys.  An endpoint can discard packet
-protection keys for that encryption level.
+Endpoints coordinate on when to discard unused keys using the RETIRE_KEYS
+frame. At a high level, each endpoint sends a RETIRE_KEYS frame when they
+are done sending using those keys; when an endpoint has both sent and received
+a RETIRE_KEYS frame for a given encryption level, it discards the corresponding
+keys. More specifically, an endpoint is done sending using a given set of keys

This is probably not what you intended here.  I think you mean to say that all *previous* keys are discarded.

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