[linux-dvb] Re: NOVA-CI and access the CAM directly

[Ralph Metzler <rjkm@metzlerbros.de>]

Sven Karlsson writes:
 > >card.Does anybody have this material?
 > 
 > The CI specification is not freely available for download although is is not

It has been posted many times on this list where the CI specs are
available. I don't know if the site in question does this legally or
is not even aware that it might not be ...


 > that expensive. And I have no clue as to what chip there is on the CI or
 > even if the datasheet is available. AFAIK things works as follows.

CiMaX datasheets are freely available from at least one of the 
manufacturers.


 > The parts of the TS that contain encryption key updates are routed to the
 > CAM via the CI. The CAM uses this information to generate the actual
 > encryption keys. In fact usually the smart card generates (parts of) the
 > encryption keys based on the subscription data.
 > 
 > There is a common encryption scheme used in DVB and the CAM mearly provide
 > the keys to this "common" ecryption scheme. All encryption is actually done
 > in the AV711x and you can read more about this in the DVB specifications and

That's not true. If you use a CAM, the CAM does all of the actual
decryption by itself.


 > the AV711x datasheet. Isn't the Nova also AV711x based?

No.


 > In short, it might very well be quite possible to make it possible to
 > receive encrypted transmissions on a Nova. It might involve doing some
 > dedicated hardware which is more expensive than obtaining a full CI capable
 > board and a CI or might even involve illegal activities.

Why go through all the trouble and not just buy a NOVA-CI card?
There also is a card by KNC1 which comes with a connector for a CI
interface. 
There just is no Linux support for the CI features of those new cards yet.



Ralph



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