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Prohibit using old keys for sending #4224

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Oct 15, 2020
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Prohibit using old keys for sending #4224

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Prohibit using old keys for sending
martinthomson Oct 14, 2020
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martinthomson Oct 15, 2020
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6 changes: 3 additions & 3 deletions draft-ietf-quic-tls.md
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Expand Up @@ -1557,9 +1557,9 @@ keys in addition to these might improve performance, but this is not essential.

## Sending with Updated Keys {#old-keys-send}

An endpoint always sends packets that are protected with the newest keys. Keys
used for packet protection can be discarded immediately after switching to newer
keys.
An endpoint never sends packets that are protected with old keys. Only the
current keys are used. Keys used for protecting packets can be discarded
immediately after switching to newer keys.

Packets with higher packet numbers MUST be protected with either the same or
newer packet protection keys than packets with lower packet numbers. An
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