Broadcast signal processing method, system, and receiver

Abstract

The invention discloses a method for processing a broadcasting signal in a conditional access system in a broadcasting field as well as a system and a receiving terminal thereof, which is used for sending signals to a plurality of terminal broadcasts through a narrow band by a sender, which comprises the steps: the signal is sent after scrambled by the sender; a scrambling control word is encrypted; encrypted information which contains the encrypted scrambling control word is sent and the encrypted information is the same information; after the scrambling control word is decrypted by the terminal according to a key for decrypting selected according to the encrypted information, the scrambling control word is used for descrambling the received signal. By using the method for processing the broadcasting signal in the conditional access system in the broadcasting field as well as the system and the receiving terminal thereof, the conditional access in the narrow-band broadcasting system can be realized, which solves the problem that large bandwidth is required to be occupied for authorizing the control information to be related with the user in the prior conditional access way; existing weakness that data flow is easy to be monitored can be eliminated; the operation of user management is flexible and convenient and at the same time a good protection effect is brought into play for the user and the broadcasting system operator.

Description

technical field [0001] The invention relates to a conditional reception system in the field of broadcasting. In particular, it relates to a broadcast signal processing method, system and receiving terminal. Background technique [0002] The conditional access (CA, Conditional Access) system is the core technology for developing pay TV and broadcasting services. It is to ensure that legal users (called authorized persons) can receive audio and video programs and data services, while illegal users cannot receive them. Get related signals. Conditional access for paid services is composed of two independent key parts, namely scrambling and descrambling of signals and encryption and decryption of reception control information, among which descrambling and decryption are undoubtedly an information processing process that requires high security. [0003] Conditional access has experienced two generations of development, the first generation is characterized by equipment-based, ge...

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Problems solved by technology

[0008] The present invention provides a broadcast signal processing method, system and receiving terminal, which are used to solve the problem that in the prior art, in the management process of authorization control information, the load on the sending front end will be greatly increased and a large amount of time will be occupied as the number of users increases. Difficulties in the bandwidth, and the problem that conditional acceptance of services cannot be realized in narrowband broadcasting

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