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Initial secrets change after Retry #2870

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Oct 31, 2019
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Initial secrets change after Retry #2870

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Initial secrets change after Retry
martinthomson Jul 3, 2019
b71c607
First Initial is misleading
martinthomson Jul 4, 2019
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martinthomson Aug 7, 2019
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12 changes: 8 additions & 4 deletions draft-ietf-quic-tls.md
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Expand Up @@ -767,8 +767,7 @@ TLS 1.3 (see {{initial-secrets}}).
## Initial Secrets {#initial-secrets}

Initial packets are protected with a secret derived from the Destination
Connection ID field from the client's first Initial packet of the
connection. Specifically:
Connection ID field from the client's Initial packet. Specifically:

~~~
initial_salt = 0x7fbcdb0e7c66bbe9193a96cd21519ebd7a02644a
Expand Down Expand Up @@ -800,8 +799,10 @@ modifying the contents of packets from future versions.
The HKDF-Expand-Label function defined in TLS 1.3 MUST be used for Initial
packets even where the TLS versions offered do not include TLS 1.3.

{{test-vectors-initial}} contains test vectors for the initial packet
encryption.
The secrets used for protecting Initial packets change when a server sends a
Retry packet to use the connection ID value selected by the server. The secrets
do not change when a client changes the Destination Connection ID it uses in
response to an Initial packet from the server.

Note:

Expand All @@ -811,6 +812,9 @@ Note:
that the server received its packet; the client has to rely on the exchange
that included the Retry packet for that property.

{{test-vectors-initial}} contains test vectors for the initial packet
encryption.


## AEAD Usage {#aead}

Expand Down