smartcard theory & ECM EMM?

bengaltiger

Hi, I want to smartcard technology (used in Digital Receiver) in detailed. Is there any books/tuto available? I want to know how a encrypted channel is decrypted also how a subscription is managed. I guess I need to learn HMK,PMK,MK ECM EMM etc. If you anyone can give this info in detailed..... Thanks, Bye BT

rolfw

Have a look here for some good basics.

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tesla

DVB protocol describes a scarmbling lagorithm. This algorithm is called CSA, Common Scrambling Algorithm. Every provider uses this algorithm.

In it's simplest way of implementing scrambled transmission, the operators scarmbls the service with a fixed key. Every one who is supposed to receive this service gets the fiexed key and he receives the service.
This method is used for connections from one partner to another. It is not convenient for operator to use it for their broadcasting.

In order to broadcast, they use one encryption system: Irdeto2, Viaccess etc How it works? Firstly, the encryption system generates a random key for CSA. The service is scrambled with the key. Then, the key is encrypted by the proprietary (and also TOP SECRET) algorithm of the encryption system. ECM contains the encrypted key.The CAM/smartcard decrypts the key. Then, the receiver gets the key and descrambls the service.

It is possible for an operator to use more than one scrambling systems. The service is scrambled, the encryption system encrypt the key. Finally, different ECMs are transmitted, one for every scrambling system.

bengaltiger

thanks,

then how its managed for different subscriber with different dates.

thanks,
BT

tesla

When a new customer subscribes, the technical staff of the operator sends a command to the smartcard. This command assigns the appropriate products to the smartcard. When the customer stops his subscription, then the technical staff sends another command to the smartcard. This commands removed any asigned product from the smartcard.

De Fault

Well, in this case the decrypted key can probably be found in the receiver's RAM memory?

To be more precise, I believe the decrypted key can probably be found in the CAM's RAM memory?

Please correct me if I am wrong.

Are there any Irdeto CAM's based on the ARM processor? Is there a JTAG interface test points available in the CAM? Did anyone try to examine the CAM's PCB? Can we have access to the CAM's PCB and JTAG test points?

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