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Re: Maturity of broadcast encryption algorithms

Cross-posted to 4 groups.

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On a sunny day (Thu, 1 Mar 2012 14:42:36 -0800 (PST)) it happened Generic
Usenet Account <usenet@sta.samsung.com> wrote in
<2c33f447-decc-462d-ad54-6eae79bcd6cd@p13g2000yqd.googlegroups.com>:

>[Reposting, previous posting probably lost.  Apologies in advance]
>
>
>Hello,
>
>I would appreciate some information on how mature the broadcast
>encryption schemes are.

DTV (digital TV) broadcasting is double encrypted.
The digital program stream is encrypted with triple DES,
the DES keys to decrypt the stream are obtained
via a second cipher, proprietary for each broadcaster,
where a new challenge is send about every ten seconds in a separate stream,
and keys in a smartcard are used to decrypt that challenge to get the DES keys.

Sound cools, but propriety system after propriety system has been hacked,
some because the cards were hacked and listed, some because of for example
Rupert Murdoch having published the code (he had it hacked by some company
to defeat the competition), brute force attempts... etc etc.
Then there is card-share, where one person has a valid card and runs a server
that sends  the decrypted DES keys every ten seconds to many 'clients', who
then just simply can decode the streams.
The word 'secure' does not apply in any way.



>  Are they used widely?  Are there any
>practical limits that will come in the way of large scale deployment?
>What is the state of the art?  What are the major challenges that are
>being tackled in this space?  Where is the current research in this
>field focused?  Are there any good open source implementations?
>
>Lots of questions.  Hopefully there will be answers for some:)

I cannot tell you more, as these day they lock you up as a terrorist if you do.
The specification of the DVB system are on www.etsi.org downloadable for all.
There are very good sources on the internet too.

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Thread

Maturity of broadcast encryption algorithms Generic Usenet Account <usenet@sta.samsung.com> - 2012-03-01 14:42 -0800
  Re: Maturity of broadcast encryption algorithms unruh <unruh@invalid.ca> - 2012-03-02 00:29 +0000
  Re: Maturity of broadcast encryption algorithms SoothSayer <SaySooth@TheMonastery.org> - 2012-03-01 22:35 -0800
  Re: Maturity of broadcast encryption algorithms Jan Panteltje <pNaonStpealmtje@yahoo.com> - 2012-03-02 10:36 +0000

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