Re: [quicwg/base-drafts] Rewrite key update section (#3050)

[David Schinazi <[e-mail]>]

DavidSchinazi commented on this pull request.



>  
-In deciding when to update keys, endpoints MUST NOT exceed the limits for use of
-specific keys, as described in Section 5.5 of {{!TLS13}}.
+## Initiating a Key Update {#key-update-initiate}
+
+Endpoints maintain separate read and write secrets for packet protection.  An
+endpoint initiates a key update by updating its packet protection write secret
+and using that to protect new packets.  The endpoint creates a new write secret
+from the existing write secret as performed in Section 7.2 of {{!TLS13}}.  This
+uses the KDF function provided by TLS with a label of "quic ku".  The

I don't know what it is either, we haven't implemented key updates yet.

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