RE: Packet Number Encryption outside of AEAD
"Deval, Manasi" <manasi.deval@intel.com> Fri, 27 July 2018 22:11 UTC
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From: "Deval, Manasi" <manasi.deval@intel.com>
To: Christian Huitema <huitema@huitema.net>, Kazuho Oku <kazuhooku@gmail.com>, Mikkel Fahnøe Jørgensen <mikkelfj@gmail.com>
CC: IETF QUIC WG <quic@ietf.org>
Subject: RE: Packet Number Encryption outside of AEAD
Thread-Topic: Packet Number Encryption outside of AEAD
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Date: Fri, 27 Jul 2018 22:11:31 +0000
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References: <CAN1APdcCdPGVEHJh4FiQBirunHUxY7HV_idYPtyQT09Fe-fSUw@mail.gmail.com> <CANatvzzMhYowiCCCz+_q+zT6LYRjDa9ru33G-tcs44G8r8cBjg@mail.gmail.com> <97ef2887-7e02-7a57-efe9-f6e54dcbf0dc@huitema.net>
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About the issue of Packet Number Encryption outside of AEAD - We agree it simplifies both hardware and software logic. It also allows the2 encryption operations to run mostly in parallel, so it is a welcome modification. Thanks, Manasi -----Original Message----- From: QUIC [mailto:quic-bounces@ietf.org] On Behalf Of Christian Huitema Sent: Friday, July 27, 2018 6:43 AM To: Kazuho Oku <kazuhooku@gmail.com>; Mikkel Fahnøe Jørgensen <mikkelfj@gmail.com> Cc: IETF QUIC WG <quic@ietf.org> Subject: Re: Packet Number Encryption outside of AEAD 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
- Packet Number Encryption outside of AEAD Mikkel Fahnøe Jørgensen
- Re: Packet Number Encryption outside of AEAD Ian Swett
- Re: Packet Number Encryption outside of AEAD Christian Huitema
- Re: Packet Number Encryption outside of AEAD Kazuho Oku
- Re: Packet Number Encryption outside of AEAD Mikkel Fahnøe Jørgensen
- Re: Packet Number Encryption outside of AEAD Christian Huitema
- RE: Packet Number Encryption outside of AEAD Deval, Manasi
- Re: Packet Number Encryption outside of AEAD Kazuho Oku
- Re: Packet Number Encryption outside of AEAD Kazuho Oku
- Re: Packet Number Encryption outside of AEAD Mikkel Fahnøe Jørgensen
- Re: Packet Number Encryption outside of AEAD Kazuho Oku
- Re: Packet Number Encryption outside of AEAD Christian Huitema
- Re: Packet Number Encryption outside of AEAD Mikkel Fahnøe Jørgensen
- Re: Packet Number Encryption outside of AEAD Kazuho Oku