Re: [TLS] Consensus for AEAD IV
Ilari Liusvaara <ilari.liusvaara@elisanet.fi> Sun, 26 April 2015 20:34 UTC
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Date: Sun, 26 Apr 2015 23:34:23 +0300
From: Ilari Liusvaara <ilari.liusvaara@elisanet.fi>
To: Michael StJohns <msj@nthpermutation.com>
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Subject: Re: [TLS] Consensus for AEAD IV
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On Sun, Apr 26, 2015 at 04:26:32PM -0400, Michael StJohns wrote: > On 4/26/2015 2:20 PM, Ilari Liusvaara wrote: > >>There is no reason to treat the 96 bit quantity as secret and no one else > >>>does. > >Oh, except SSH. The session nonce is 96 bits and secret. > > SSH uses CBC exclusively as far as I can tell. The fact that the mixin of > the first block of the first message (AKA the initial IV) is generated via > keyed material from the negotiated shared secret is actually a problem > (similar to the problems in TLS 1.2 and before) and doesn't actually provide > any security. SSH can also use: - CTR (start from 128-bit secret initial IV, no packet boundaries) - AES-GCM (96 bit secret initial IV, increments per packet) - Chacha20-Poly1305 (uses message sequence as nonce) (In fact, I think the semi-offical recommendation is "don't use CBC in SSH"). -Ilari
- [TLS] Consensus for AEAD IV Joseph Salowey
- Re: [TLS] Consensus for AEAD IV Martin Thomson
- Re: [TLS] Consensus for AEAD IV Joseph Salowey
- Re: [TLS] Consensus for AEAD IV Martin Thomson
- Re: [TLS] Consensus for AEAD IV Russ Housley
- Re: [TLS] Consensus for AEAD IV Michael StJohns
- Re: [TLS] Consensus for AEAD IV Yoav Nir
- Re: [TLS] Consensus for AEAD IV Michael StJohns
- Re: [TLS] Consensus for AEAD IV Ilari Liusvaara
- Re: [TLS] Consensus for AEAD IV Brian Smith
- Re: [TLS] Consensus for AEAD IV Michael StJohns
- Re: [TLS] Consensus for AEAD IV Ilari Liusvaara
- Re: [TLS] Consensus for AEAD IV Michael StJohns
- Re: [TLS] Consensus for AEAD IV Michael StJohns
- Re: [TLS] Consensus for AEAD IV Yoav Nir
- Re: [TLS] Consensus for AEAD IV Michael StJohns
- Re: [TLS] Consensus for AEAD IV Yoav Nir
- Re: [TLS] Consensus for AEAD IV Michael StJohns
- Re: [TLS] Consensus for AEAD IV Yoav Nir
- Re: [TLS] Consensus for AEAD IV Eric Rescorla
- Re: [TLS] Consensus for AEAD IV Nikos Mavrogiannopoulos