See below.
_____________
Art Allison
Director,
Advanced Engineering
Science & Technology
National Association of
Broadcasters
1771 N Street, NW
Washington, D.C. 20036
Phone:
202.429.5418
Fax: 202.777.4981
aallison@nab.org
The National
Association of Broadcasters is a trade association that
advocates on behalf
of more than 8,300 free, local radio and television
stations and also
broadcast networks before Congress, the Federal
Communications Commission and
the Courts.
-----Original Message-----
From:
owner-ipdvb@erg.abdn.ac.uk [mailto:owner-ipdvb@erg.abdn.ac.uk]
On
Behalf Of H.Cruickshank@surrey.ac.uk
Sent: Thursday, June 22, 2006 2:09
PM
To: gorry@erg.abdn.ac.uk; ipdvb@erg.abdn.ac.uk;
S.Iyengar@surrey.ac.uk;
P.Pillai@Bradford.ac.uk
Subject: RE:
Security-Requirements: alternatives?
Hi Gorry,
This issue
has been addressed in the security draft. Some text has
been
added to section 5.1 to this effect:
Basically, in practice there are not
many L2 security systems for MPEG
transmission networks. Two major
examples are:
* Conditional access for digital TV broadcasting is one
example that
exists today. This system is optimised for TV broadcast
services only,
and is not suitable for IP packet transmissions and difficult
to
interwork with ULE.
AA> See ATSC A/70A. I strongly disagree with
assertion about the
difficulty to interwork with ULE. The ULE can be put in a
virtual
channel in the ATSC system and the standard directly
applied.
* Some other L2 security systems are specified in standards such
the MPE
for DVB system . However, MPE security incomplete and there are no
known
implementations of such security system.
* For DVB-S2 Generic
Streams, where IP encapsulation could be similar to
ULE. The authors believe
that ULE security format can be used for
Generic Streams as well.
We
would like to ask the ipdvb WG if anybody knows any other existing
L2
security systems that might be suitable for ULE.
AA> See ATSC
A/70A for ULE when sent in conformance with ATSC
Standards.
Haitham
----
Dr. Haitham S.
Cruickshank
Lecturer
Communications Centre for Communication Systems
Research (CCSR) School
of Electronics, Computing and Mathematics University
of Surrey,
Guildford, Surrey GU2 7XH, UK
Tel: +44 1483 686007
(indirect 689844)
Fax: +44 1483 686011
e-mail:
H.Cruickshank@surrey.ac.uk
http://www.ee.surrey.ac.uk/Personal/H.Cruickshank/
-----Original
Message-----
From: Gorry Fairhurst [mailto:gorry@erg.abdn.ac.uk]
Sent: 22
June 2006 15:37
To: Cruickshank HS Dr (CCSR); ipdvb@erg.abdn.ac.uk; Iyengar S
Mr (CCSR);
P.Pillai@Bradford.ac.uk
Subject: Security-Requirements:
alternatives?
Haitham, I-D Authors, List,
One of the issues we
need to be clear about in preparing for a WG
adoption of the security
requirements I-D is the possible alternatives
that have been
proposed/implemented in other standards organisations.
Could you
summarise the methods that have been proposed for MPEG-2
transmission
networks that provide equivalent L2 security functions, and
say which to your
knowledge has actually have been implemented
in
systems?
Thanks,
Gorry