Decryption-key distribution method and authentication apparatus

Abstract

A decryption key for decrypting data from an access node is distributed to an access terminal intending to receive the data. An authentication unit receives a message for terminal authentication including a terminal identifier from the terminal and authenticates the terminal. The authentication unit refers to a content registration table having stored in advance the content type of a content which the terminal can receive, in association with the terminal identifier, according to the received terminal identifier to obtain a corresponding content type. The authentication unit refers to a decryption data base having stored in advance a decryption key and its valid period in association with a content type, according to the obtained content type to obtain a corresponding decryption key and valid period. The authentication unit sends an authentication result and the decryption key and valid period to the terminal or to a packet control unit.

Description

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AI Technical Summary

Benefits of technology

The present invention provides a method for safely distributing a decryption key to a mobile terminal without increasing the amount of communication dedicated to decryption-key distribution. The decryption key can be updated without interruption while data is being received through a broadcast channel. The method also allows for the distribution of multiple decryption keys at different timings to prevent communication from converging at a certain period. Additionally, the method reduces the time required for a terminal to generate a decryption key and reduces the period from when a terminal starts a session to when the terminal starts receiving broadcast data.

Problems solved by technology

The patent text describes a method for securely transmitting data through a broadcast channel to mobile terminals by encrypting the data and using a decryption key to prevent unauthorized distribution. The method also includes steps for establishing a connection between the mobile terminal and a packet data network (PDN) for communication. However, the conventional methods require a long time to obtain the decryption key and perform many steps to establish a unicast radio resource for communication. The technical problem is to improve the speed and efficiency of the method by reducing the processing load on the PDN and BCMCS controllers and eliminating the need for a large-scale facility.

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