Method, system, conditional receiving module and customer terminal for obtaining service key

Abstract

The invention provides a method for acquiring a service key and a system thereof. The method comprises the following steps: a network terminal generates an initial service key required by a user randomly, and generates initial authorization management information with a cryptograph mode and authority information of user subscription service to be transmitted to a user terminal; the user terminal receives the initial authorization management information, and decrypts the information to obtain an initial service key; when updating is triggered, the user terminal automatically generates and updates the service key required in the authority of subscription service by current service key by adopting the operation process being same as the network terminal. The invention also provides a condition receiving module and a user terminal. The invention can improve the authorization efficiency of the user terminal and save resource of the network terminal by a simple and easy service authorization method, thereby saving transmission bandwidth.

Description

technical field [0001] The invention relates to the field of data communication of a conditional access system, in particular to a service key acquisition method and system, a user terminal and a conditional access module. Background technique [0002] Conditional access is to implement different protections for various service businesses through effective means, and to control users who purchase corresponding authorizations. For example, for various existing fee-paying services, such as pay TV, pay TV immediately, video on demand, etc., it is necessary to authorize when the user watches and which channel to watch. [0003] On the network side, video, audio or data streams must first be scrambled and encrypted under the control of control words. These control words are also called keys. For the conditional access system authorized by broadcast mode, the service key is encrypted by the user key to form entitlement management information (EMM: Entitlement Management Message)....

AI Technical Summary

Problems solved by technology

Therefore, the network cannot transmit the key information data to the user terminal in time when the user terminal needs specific key information

[0005] For example, for a user who subscribes to a monthly subscription service, the service key needs to be updated monthly, and the user needs to regularly extract the corresponding key information data from the carousel EMM information every month. Therefore, the existing authorization method undoubtedly reduces the user experience. Spend

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