In -tls13-11 section 7.2 [1] there is this..
7.2. Updating Traffic Keys and IVs
Once the handshake is complete, ...
[...]
Once traffic_secret_N+1 and its associated traffic keys have been
computed, implementations SHOULD delete traffic_secret_N. Once the
directional keys are no longer needed, they SHOULD be deleted as
well.
..and it isn't clear to me what is meant by "directional keys" in the
paragraph above (that is the only occurance of the term I find)?
is the term meant as a forward reference to this table in S 7.3 and thus
to the notion of "client write key" and "server write key" ?
+------------------+--------------------+
| Key Type | Purpose |
+------------------+--------------------+
| Client Write Key | "client write key" |
| | |
| Server Write Key | "server write key" |
[...]
+------------------+--------------------+
thx,
=JeffH
[1] https://tools.ietf.org/html/draft-ietf-tls-tls13-11#section-7.2
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