Re: [quicwg/base-drafts] Add retry integrity tag (#3120)

David Schinazi <> Wed, 23 October 2019 20:32 UTC

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Date: Wed, 23 Oct 2019 13:32:57 -0700
From: David Schinazi <>
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Subject: Re: [quicwg/base-drafts] Add retry integrity tag (#3120)
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DavidSchinazi commented on this pull request.

> @@ -1197,6 +1197,64 @@ TLS ClientHello.  The server MAY retain these packets for later decryption in
 anticipation of receiving a ClientHello.
+## Retry Packet Integrity {#retry-integrity}
+Retry packets (see the Retry Packet section of {{QUIC-TRANSPORT}}) carry a
+Retry Integrity Tag that provides two properties: it allows discarding
+packets that have accidentally been corrupted by the network, and it mitigates
+off-path attackers' ability to send valid Retry packets.
+The Retry Integrity Tag is a 128-bit field that is computed as the output of
+AEAD_AES_128_GCM {{!AEAD=RFC5116}} used with the following inputs:
+- The secret key, K, is 128 bits all set to zero.
+- The nonce, N, is 96 bits all set to zero.
+- The plaintext is empty.
+- The associated data is the contents of the Retry Pseudo-Packet, as described

Fine by me. Can you suggest another verb?

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