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Re: Simple transform for improving PN ossification prevention

Victor Vasiliev <vasilvv@google.com> Tue, 10 April 2018 08:03 UTC

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From: Victor Vasiliev <vasilvv@google.com>
Date: Tue, 10 Apr 2018 08:03:31 +0000
Message-ID: <CAAZdMafa6AgbyO2ZvTBcMND_SsQZhobZJ6vXwbZ3pvQ4VmHNhg@mail.gmail.com>
Subject: Re: Simple transform for improving PN ossification prevention
To: Praveen Balasubramanian <pravb=40microsoft.com@dmarc.ietf.org>
Cc: IETF QUIC WG <quic@ietf.org>
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On Mon, Apr 9, 2018, 13:48 Praveen Balasubramanian <pravb=
40microsoft.com@dmarc.ietf.org> wrote:

> Requirements for any PN transform in the single path case:
>
>    1. The actual PN must always increment by 1 and will be used for
>    generating ACKs in ACK frames.
>    2. The transformed PN in the clear is a nonce and must not repeat over
>    the connection lifetime.
>    3. Middleboxes must not be able to determine the actual PN. Only the
>    QUIC receiver should be able to do so.
>
> Well, this sounds like you're requiring a block cipher.

>

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