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Re: [tram] Stephen Farrell's Discuss on draft-ietf-tram-turn-third-party-authz-13: (with DISCUSS and COMMENT)

"Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com> Wed, 22 April 2015 04:11 UTC

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From: "Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com>
To: "Salz, Rich" <rsalz@akamai.com>, "Williams, Brandon" <bowill@akamai.com>, Martin Thomson <martin.thomson@gmail.com>
Thread-Topic: [tram] Stephen Farrell's Discuss on draft-ietf-tram-turn-third-party-authz-13: (with DISCUSS and COMMENT)
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Date: Wed, 22 Apr 2015 04:11:34 +0000
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References: <913383AAA69FF945B8F946018B75898A4120E0BD@xmb-rcd-x10.cisco.com> <55369856.7050203@akamai.com> <913383AAA69FF945B8F946018B75898A41214674@xmb-rcd-x10.cisco.com> <a20208ec333b45d29956e5bda4a61686@usma1ex-dag1mb2.msg.corp.akamai.com>
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Subject: Re: [tram] Stephen Farrell's Discuss on draft-ietf-tram-turn-third-party-authz-13: (with DISCUSS and COMMENT)
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> -----Original Message-----
> From: Salz, Rich [mailto:rsalz@akamai.com]
> Sent: Wednesday, April 22, 2015 7:52 AM
> To: Tirumaleswar Reddy (tireddy); Williams, Brandon; Martin Thomson
> Cc: tram-chairs@ietf.org; tram@ietf.org; rlb@ipv.sx; Stephen Farrell
> (stephen.farrell@cs.tcd.ie)
> Subject: RE: [tram] Stephen Farrell's Discuss on draft-ietf-tram-turn-third-
> party-authz-13: (with DISCUSS and COMMENT)
> 
> > HKDF https://tools.ietf.org/html/rfc5869 can be used to derive the key for
> > SHA1 from 256-bit key
> 
> Too complicated.  Just do a SHA1 on the 256 bit key.

https://tools.ietf.org/html/rfc6194#section-3 discusses problems with SHA1. Is it safe to derive key using SHA1 ?

-Tiru

> 
> --
> Senior Architect, Akamai Technologies
> IM: richsalz@jabber.at Twitter: RichSalz

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