Re: [TLS] Results of interim meeting
"Blumenthal, Uri - 0558 - MITLL" <uri@ll.mit.edu> Tue, 27 May 2014 13:48 UTC
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From: "Blumenthal, Uri - 0558 - MITLL" <uri@ll.mit.edu>
To: "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] Results of interim meeting
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Date: Tue, 27 May 2014 13:48:21 +0000
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Archived-At: http://mailarchive.ietf.org/arch/msg/tls/mnpEEX_gE_tDvZv2zarUfflMT9A
Subject: Re: [TLS] Results of interim meeting
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> Specifically, in current TLS, the MS [0] and subsequently the
> session keys [1] are computed as a PRF of the PMS/MS and
> random values, specifically:
>
> master_secret = PRF(pre_master_secret, "master secret",
> ClientHello.random + ServerHello.random)
> [0..47];
>
> As the triple handshake paper observes, this allows an attacker
> to force two handshakes to produce the same MS by duplicating
> the PMS and the randoms. The current proposal is to replace the
> random values with a hash of the handshake transcript, i.e.,
>
> master_secret = PRF(pre_master_secret, "extended master secret",
> session_hash)
> [0..47];
Why not
master_secret = PRF(pre_master_secret, "extended master secret",
Hash(ClientHello.random + ServerHello.random +
session_hash)) [0..47];
- [TLS] Results of interim meeting Watson Ladd
- Re: [TLS] Results of interim meeting Andy Lutomirski
- Re: [TLS] Results of interim meeting Watson Ladd
- Re: [TLS] Results of interim meeting Eric Rescorla
- Re: [TLS] Results of interim meeting Andy Lutomirski
- Re: [TLS] Results of interim meeting Blumenthal, Uri - 0558 - MITLL