Re: [TLS] [Emu] Fwd: Benjamin Kaduk's Discuss on draft-ietf-emu-eap-tls13-13: (with DISCUSS and COMMENT)

Martin Thomson <mt@lowentropy.net> Tue, 12 January 2021 00:09 UTC

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Date: Tue, 12 Jan 2021 11:08:45 +1100
From: "Martin Thomson" <mt@lowentropy.net>
To: "Joseph Salowey" <joe@salowey.net>
Cc: "<tls@ietf.org>" <tls@ietf.org>, "EMU WG" <emu@ietf.org>
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Subject: Re: [TLS] =?utf-8?q?=5BEmu=5D_Fwd=3A_Benjamin_Kaduk=27s_Discuss_on_d?= =?utf-8?q?raft-ietf-emu-eap-tls13-13=3A_=28with_DISCUSS_and_COMMENT=29?=
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On Mon, Jan 11, 2021, at 17:07, Joseph Salowey wrote:
> 
> 
> On Thu, Jan 7, 2021 at 2:42 PM Martin Thomson <mt@lowentropy.net> wrote:
> > Hi Joe,
> > 
> > Thanks for doing this, I think that this is a distinct improvement (and I will take your word for the difficulties involved with further splits).
> > 
> > One point that I made poorly perhaps, and was dismissed, might be worth restating:
> > 
> > MSK = TLS-Exporter("EXPORTER_EAP_TLS_MSK", Type-Code, 64) 
> > 
> 
> [Joe] I think you propose something like this instead (eliminating context):
> 
> MSK = TLS-Exporter("EXPORTER_EAP_TLS_MSK-" + ASCII-Type-Code, 64) 
> 
> Where + is concatenation and ASCII-Type-Code is "13"

I was not exactly.  I was thinking that EAP-TLS uses the unadorned string and other usages (that need a different MSK) define their own string as needed.  Though what you describe would scale more, if the ordinality of that scale is bounded by RFC numbers, defining the extra strings would not be that hard.  You could provide some sort of infrastructure in the form of a recommended label prefix if you are concerned about misuse.