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Re: Packet Number Encryption outside of AEAD

Christian Huitema <huitema@huitema.net> Fri, 27 July 2018 13:43 UTC

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To: Kazuho Oku <kazuhooku@gmail.com>, Mikkel Fahnøe Jørgensen <mikkelfj@gmail.com>
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From: Christian Huitema <huitema@huitema.net>
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Date: Fri, 27 Jul 2018 06:43:22 -0700
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Subject: Re: Packet Number Encryption outside of AEAD
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On 7/26/2018 9:14 PM, Kazuho Oku wrote:
> Consider the case where a sender encodes a packet number using 4
> octets even when just using 1 octet is enough.
>
> An on-path attacker rewrites the packet by applying XOR 0x80 to the
> first octet of the encrypted PN, and trimming the latter three octets
> of the encrypted PN.
That attack does not work, because the encoding of the PN is big-endian.
The actual packet number is in the fourth octet. Or rather, it only
works in the special case where the PN is 0.

-- Christian Huitema

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