Maturity of broadcast encryption algorithms

[Generic Usenet Account]

[Reposting, previous posting probably lost. Apologies in advance]


Hello,

I would appreciate some information on how mature the broadcast
encryption schemes are. 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:)

Thanks,
Bhta

[unruh]

Post by Generic Usenet Account
[Reposting, previous posting probably lost. Apologies in advance]
Hello,
I would appreciate some information on how mature the broadcast

What is a broadcast encryption scheme?

Post by Generic Usenet Account
encryption schemes are. 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:)
Thanks,
Bhta

[Jan Panteltje]

On a sunny day (Thu, 1 Mar 2012 14:42:36 -0800 (PST)) it happened Generic

Post by Generic Usenet Account
[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.

Post by Generic Usenet Account
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.