Subject: [AVTCORE] [Technical Errata Reported] RFC5764 (4788)

From: RFC Errata System <[email-masked]>
Date: Tue, 30 Aug 2016 06:25:57 -0700 (PDT)

The following errata report has been submitted for RFC5764,
"Datagram Transport Layer Security (DTLS) Extension to Establish Keys for the Secure Real-time Transport Protocol (SRTP)".

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You may review the report below and at:
http://www.rfc-editor.org/errata_search.php?rfc=5764&eid=4788

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Type: Technical
Reported by: Eric Rescorla <[email-masked]>

Section: 5.3

Original Text
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Section 4.2 says:
   which are assigned as shown below.  The per-association context value
   is empty.

Corrected Text
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   which are assigned as shown below.  No per-association context value
   is used.

Notes
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This code is somewhat ambiguous, though the better interpretation is probably that you should use a zero-length context (arm 2 of https://tools.ietf.org/html/rfc5705#section-4). However, real implementations do not seem to use the exporter value, so we need to resolve this in that direction.

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RFC5764 (draft-ietf-avt-dtls-srtp-07)
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Title               : Datagram Transport Layer Security (DTLS) Extension to Establish Keys for the Secure Real-time Transport Protocol (SRTP)
Publication Date    : May 2010
Author(s)           : D. McGrew, E. Rescorla
Category            : PROPOSED STANDARD
Source              : Audio/Video Transport
Area                : Real-time Applications and Infrastructure
Stream              : IETF
Verifying Party     : IESG