Add descrambling technique
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The plus descrambling technique is used for encrypting and decrypting digital programs. The basic principle is to use the method of scrambling control words to encrypt and transmit, and the user end uses the IC card to decrypt. In the MPEG transport stream, there are two data streams associated with control word transmission: Entitlement Control Information (ECMs) and Authorization Management Information (EMMs), and control words encrypted by the Service Key (SK) are transmitted in the ECMs. It also includes program information such as program source, time, content classification, and program price. The service key encrypted by the control word is transmitted in the authorization management, and the service key is subjected to encryption processing by the user's personal distribution key (PDK) before being transmitted. The EMMs also include an address and user authorization information, such as a user can view. Program or time period, user paid viewing fees, etc.
The User Personal Distribution Key (PDK) is stored in the user's Smart Card. On the user side, the set-top box obtains the EMM and ECM PID values ​​according to the CA-descriptor in the PMT and CAT tables, and then filters out the ECMs and EMMs from the TS stream and sends them to the Smart Card through the Smard Card interface. The Smart Card first reads the user's personal distribution key (PDK), decrypts the EMM with the PDK, extracts the SK, then decrypts the ECM with the SK, extracts the CW, and sends the CW to the descrambling engine through the Smart Card interface. The descrambling engine The disturbed transport stream can be descrambled using CW.
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