[AVTCORE] [Technical Errata Reported] RFC3711 (3712)

RFC Errata System <rfc-editor@rfc-editor.org> Tue, 27 August 2013 11:19 UTC

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Subject: [AVTCORE] [Technical Errata Reported] RFC3711 (3712)
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The following errata report has been submitted for RFC3711,
"The Secure Real-time Transport Protocol (SRTP)".

You may review the report below and at:

Type: Technical
Reported by: Christian S Oien <coien@cisco.com>

Section: 4.3.2

Original Text
Replace the SRTP index by the 32-bit quantity: 0 || SRTCP index
(i.e., excluding the E-bit, replacing it with a fixed 0-bit), and use

Corrected Text
Replace the SRTP index by the 48-bit quantity: 0 || SRTCP index
(i.e., excluding the E-bit, replacing it with a fixed 0-bit and then
prepending a 16-bits zero padding), and use

Replacing with a 32-bit quantity means that the DIV operator will
yield a 32-bit quantity.  Following the specification of key_id for SRTCP
the <label> will have 32 bits to its right when XOR'ing with master_salt.

The majority of implementations, including libsrtp, invokes this XOR with the
<label> at the same position as for SRTP.  According to the specification
this should be done 16 bits to the right of this, when invoking for SRTCP.

This errata is currently posted as "Reported". If necessary, please
use "Reply All" to discuss whether it should be verified or
rejected. When a decision is reached, the verifying party (IESG)
can log in to change the status and edit the report, if necessary. 

RFC3711 (draft-ietf-avt-srtp-09)
Title               : The Secure Real-time Transport Protocol (SRTP)
Publication Date    : March 2004
Author(s)           : M. Baugher, D. McGrew, M. Naslund, E. Carrara, K. Norrman
Category            : PROPOSED STANDARD
Source              : Audio/Video Transport
Area                : Real-time Applications and Infrastructure
Stream              : IETF
Verifying Party     : IESG