Re: [quicwg/base-drafts] Output of the discard keys design team (#2673)

David Schinazi <> Wed, 08 May 2019 00:13 UTC

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From: David Schinazi <>
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Subject: Re: [quicwg/base-drafts] Output of the discard keys design team (#2673)
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DavidSchinazi commented on this pull request.

> +### Discarding 0-RTT Keys
+Clients SHOULD discard 0-RTT keys as soon as they install 1-RTT keys, since
+they have no use after that moment.
+Clients do not send 0-RTT packets after sending a 1-RTT
+packet ({{using-early-data}}).  Therefore a server MAY discard 0-RTT keys as
+soon as it receives a 1-RTT packet.  However, due to packet reordering, a
+client's valid 0-RTT packet could arrive after a 1-RTT packet.  Servers MAY
+temporarily retain 0-RTT keys to allow decrypting reordered packets without
+requiring their contents to be retransmitted with 1-RTT keys.  There is a bound
+on how long these keys can be temporarily retained: servers MUST have discarded
+0-RTT keys once three times the Probe Timeout (PTO, see {{QUIC-RECOVERY}}) has
+elapsed after receiving a 1-RTT packet.  Servers MAY also keep track of
+received 0-RTT packet numbers as an indication that all of them have been
+received which allows them to discard 0-RTT keys earlier.


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