KR20060118261A - Conditional access system and method for digital multimedia broadcasting using wireless internet - Google Patents

Abstract

A DMB(Digital Multimedia Broadcasting) conditional access system and a method thereof using wireless Internet are provided to authenticate terminals using the wireless Internet without using a smart card. A DMB conditional access system using wireless Internet includes wireless Internet(120), a broadcasting center(110), and a mobile communication terminal(130). The wireless Internet transmits and receives information about conditional access of subscribers. The broadcasting center includes a broadcasting server(111) for scrambling broadcasting data and transmitting the scrambled data through a broadcasting channel, and an authentication server(112) for receiving the information about conditional access of subscribers through the wireless Internet, encoding a subscriber authentication and descrambling key using the received information and transmitting the encoded key. The mobile communication terminal includes an authentication key decoder(136) for decoding the encoded descrambling key received through the wireless Internet, a descrambler(137) for descrambling the scrambled broadcasting data received through the broadcasting channel, and an authentication unit(134) for transmitting the information about conditional access of subscribers through the wireless Internet and receiving the encoded descrambling key.

Description

Conditional access system and method for receiving digital multimedia broadcasting using wireless internet {Conditional access system and method for digital multimedia broadcasting using wireless internet}

1 is a block diagram of a conventional digital multimedia broadcasting receiver.

2 is a block diagram showing a system for receiving DMB restrictions using the wireless Internet according to an embodiment of the present invention.

3 is a flowchart illustrating a method for receiving DMB restriction using the wireless Internet according to an exemplary embodiment of the present invention.

4 is a flowchart illustrating a method for processing a descramble key using wireless Internet in a broadcasting center according to an exemplary embodiment of the present invention.

5 is a flowchart illustrating a data descramble processing method using a wireless Internet in a mobile communication terminal according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

110 Broadcasting Center 111 Broadcasting Server

112 Authentication Server 113 Authentication Key Generator

120 Wireless Internet 130 Mobile Terminal

131 ... Receiver 132 ... Demultiplexer

133 ... terminal information storage 134 ... authentication

135 ... Receive Receiver 136 ... Descrambler

Descrambler Key Decryptor Video Decoder

139 Audio Decoder 140 Display

141 ... speakers

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital multimedia broadcasting (DMB) system, and more particularly, to a limited reception system and method for transmitting and receiving limited reception information using wireless Internet.

Digital Multimedia Broadcasting (DMB) is a digital broadcast wave that is broadcast through a satellite or terrestrial repeater by multiplexing digital broadcast data of a plurality of programs compressed using a highly efficient compression algorithm such as a moving picture expert group (MPEG). Will be. That is, the digital broadcast data is divided into data such as video and audio, compressed and divided into transport packets (TPs) of a predetermined unit, and then multiplexed and transmitted into a transport stream (TS). In each transport stream, digital broadcast data for a plurality of programs is multiplexed, and a user selects and watches an arbitrary program among them.

1 is a diagram showing the configuration of a conventional digital multimedia broadcasting receiver. The conventional digital multimedia broadcasting receiver includes an antenna 10, a DMB receiving module 20, a decoder module 30, a display unit 50, and a speaker 60. In addition, since digital multimedia broadcasting is basically paid broadcasting, a conditional access system (CAS) is adopted to restrict broadcasting reception. The conventional limited reception system used for digital broadcasting transmits an Entitlement Management Massage (EMM), an Entitlement Control Message (ECM), and scrambled contents using a broadcast channel.

The DMB receiving module 20 and the decoder module 30 are each composed of one chip, and the limited receiving unit 33 for performing the limited receiving function (or limited receiving function) is included in the decoder module 30 and implemented. .

In the conventional receiver, the digital broadcast data received through the antenna 10 is reproduced in the original transport stream by the demodulator 21 of the DMB receiving module 20, and the reproduced transport stream is an error in the error correction 23. After the forward error is corrected, it is input to the decoder module 30.

The decoder module 30 demultiplexes a transmission stream multiplexed with digital broadcast data of a plurality of programs by the TS demultiplexer 31, and extracts transmission packets including digital broadcast data of a program selected by a user. At this time, the digital broadcast data is encrypted and transmitted for limited reception. The restriction receiver 33 of the decoder module 30 descrambles, that is, decrypts, the encrypted digital broadcast data using the scrambling key generated by the smart card 40. That is, the restriction receiver 33 extracts the EMM and ECM information included in the broadcast channel and sends the extracted EMM and ECM information to the smart card 40. The smart card 40 generates the descramble key using the EMM and ECM information. By transmitting to the decoder module 30, the descrambler of the decoder module 30 decrypts the broadcast data using the descramble key. Here, the TS demultiplexer 31 includes a section filter, and the decoder module 30 includes a descrambler and a packet filter.

The decrypted digital broadcast data is decoded by the MPEG video decoder 35 and the MPEG audio decoder 37 of the decoder module 30 and provided to the user through the display unit 50 and the speaker 60.

Such a conditional access system (CAS) performs scrambling before transmitting a broadcast signal from a broadcasting station that emits radio waves for a fee, and descrambles the received broadcast signal on the receiving side so that only a legitimate subscriber can watch. . To this end, the conventional limited reception system must be equipped with a smart card because the terminal performs authentication by a smart card.

On the other hand, in recent years, as DMB is standardized as a portable digital broadcasting, and a DMB dual terminal is made, using a smart card has a disadvantage of limiting the size of the portable terminal and increasing the price.

It is a first object of the present invention to provide a digital multimedia broadcasting limited reception system using wireless internet and a method of operating the same, which enable terminal authentication using wireless internet without using a smart card.

A second object of the present invention is a digital multimedia broadcasting limited reception system and a method of operating the same, which can be used to perform authentication of a subscriber and to encrypt and decrypt a descramble key by using limited reception information of a subscriber using the wireless Internet. In providing.

A third object of the present invention is to provide a system for limiting digital multimedia broadcasting using the wireless Internet and an operation method thereof, which can be used for subscriber authentication, encryption and decryption of a scramble key using unique MIN and / or ESN information of a terminal. Is in.

Digital multimedia broadcasting limited reception system using the wireless Internet according to an embodiment of the present invention for achieving the above object,

A wireless internet network for transmitting and receiving information on limited reception of a subscriber;

Receiving the broadcast server and scrambled broadcast data transmitted through a broadcast channel, and receives the subscriber's limited reception information through the wireless Internet network and encrypts the subscriber authentication and descramble key using the received received reception information and transmits A broadcast center including an authentication server;

An authentication key decryption unit for decrypting the encrypted descramble key received through the wireless Internet network using the limited reception information of the subscriber, a descrambler for descrambling the scrambled broadcast data received through the broadcast channel; And a mobile communication terminal including an authentication unit for transmitting the limited reception information of the subscriber through the wireless Internet and receiving the encrypted descramble key.

Preferably, the limited reception information of the subscriber may include a mobile identification number (MIN) and / or an electronic serial number (ESN) of the mobile communication terminal.

Preferably, the authentication server encrypts a descrambling key for descrambling the scrambled broadcast data by using MIN and / or ESN information of the terminal, and the descrambling key decryption unit decodes the MIN and / or ESN of the terminal. And decrypting the encrypted descrambling key using the information.

In accordance with another aspect of the present invention, there is provided a digital multimedia broadcasting limit reception method using a wireless Internet, the method comprising: receiving scrambled digital broadcasting data through a broadcasting channel transmitted from a broadcasting center in a mobile communication terminal;

A scrambling key for transmitting limited reception information to a broadcasting center through a wireless Internet network in the mobile communication terminal, performing authentication by receiving the limited reception information in a broadcasting center, and receiving the scrambling digital broadcast data for an authenticated subscriber. Encrypting and transmitting the data to the mobile communication terminal through the wireless Internet;

And after the encrypted scrambling key is received by the mobile terminal, decrypted using the limited reception information, and then descrambling the scrambling digital broadcast data using the decrypted scrambling key. .

Preferably, the limited reception information of the subscriber may include MIN (Mobile Identification Number) and / or Electronic Serial Number (ESN) information included in the mobile communication terminal.

Preferably, the mobile communication terminal encrypts a descrambling key for descrambling the scrambled broadcast data using MIN and / or ESN information of the terminal, and uses the MIN and / or ESN information of the terminal. And decrypting the encrypted descrambling key.

Hereinafter, with reference to the accompanying drawings as follows.

2 is a block diagram illustrating a digital multimedia broadcasting restriction system using the wireless Internet according to the present invention.

Referring to FIG. 2, the broadcast center 110 transmits broadcast data through a broadcast channel, receives a broadcast center 110 for performing subscriber authentication through a wireless internet network 120, and receives digital broadcast data received through a broadcast channel and wirelessly. The mobile terminal 130 descrambles the broadcast data using an authentication key received through the Internet network 120.

Here, the broadcast center 110 is connected to the broadcast server 111 for transmitting scrambled broadcast data and the wireless Internet network 120 and performs subscriber authentication using terminal information transmitted from the terminal 130. An authentication server 112 and an authentication key generator 113 for performing authentication using the terminal information and generating an authentication key for an authenticated subscriber.

The mobile communication terminal 130 is a terminal capable of processing multimedia data having a mobile call function. The mobile communication terminal 130 includes a receiver 131 for receiving digital broadcast data and a demultiplexer for demultiplexing the received digital broadcast data. TS DEMUX) 132, a terminal information storage unit 133 storing terminal information, an authentication unit 134 for transmitting terminal information and receiving an authentication key through the wireless Internet network 120, and the received authentication. A limited receiver 135 including a descrambling key decryption unit 136 for generating a descrambling key using a key and terminal information, and a descrambler 137 for descrambling the digital broadcast data with the descrambling key; A video decoder 138 for decoding the video data among the descrambled data and outputting the decoded data to the screen display unit 140, and the audio data among the descrambled data. The audio decoder 139 decodes and outputs the speaker 141 to the speaker 141.

With reference to the accompanying drawings, a digital multimedia broadcasting restriction system using wireless Internet and its operation method according to an embodiment of the present invention configured as described above will be described.

Referring to FIG. 2, the broadcast center 110 transmits scrambled digital broadcast data through a broadcast channel, and performs subscriber authentication through the wireless Internet network 120. The digital broadcast data includes at least one of video data, audio data, and additional data compressed and coded and divided into transmission packets of a predetermined unit. Here, the video data and the audio data are compressed and encoded using a conventional compression scheme such as H.264 (MPEG4 p.10) or MPEG4 AAC. The additional data may include text data such as caption data related to video data, audio data, and the like. The divided transport packet data are encrypted using a scrambling key for limited reception, and then multiplexed into one digital broadcast data stream, that is, a transport stream.

To this end, the broadcast center 110 includes a broadcast server 111, an authentication server 112, and an authentication key generator 113, and the broadcast server 110 transmits scrambled digital broadcast data through a broadcast channel. Done. This scrambles broadcast content and transmits it to a broadcast channel in order to prevent non-subscriber from receiving a broadcast. The scramble algorithm may generally use the DVB common scramble algorithm. This scrambled key may be changed at regular intervals. For example, it can be changed every 5 minutes.

The authentication server 112 performs subscriber authentication, i.e., authenticates whether the subscriber is a euro subscriber or a free subscriber. To this end, DMB subscriber authentication is requested from a mobile communication terminal through a wireless Internet network. When the subscriber authentication request is made, the mobile terminal 130 transmits terminal information together. The terminal information includes, for example, one or more of a mobile identification number (MIN) and an electronic serial number (ESN). Here, for the purpose of explanation, subscriber authentication is performed using both the MIN and ESN information.

At this time, if the authentication server 112 receives the terminal information (MIN, ESN) with the subscriber authentication request from the mobile communication terminal 130 through the wireless Internet network 120, to perform the subscriber authentication using the terminal information do. To this end, the terminal information of the subscriber is pre-built into a database, and the terminal information is authenticated.

If the subscriber is authenticated by the authentication server 112, the authentication key generator 113 encrypts the descramble key capable of descrambled the scrambled data using the terminal information MIN and ESN.

The encrypted descramble key is transmitted by the authentication server 112 to the mobile communication terminal 130 through the wireless internet network 120. In this case, when the scrambled key is periodically changed, the descrambled key is also changed, so that the changed encrypted descrambled key is periodically changed and transmitted. That is, terminal information is used as limited reception information of broadcast data for the subscriber.

Meanwhile, the mobile communication terminal 130 receives and demodulates the scrambled digital broadcast data through the broadcast channel, and descrambles and reproduces it.

To this end, the mobile communication terminal 130 includes a receiver 131, a demultiplexer 132, a terminal information storage 133, an authentication unit 134, a restriction receiver (CAS) 135, and a video decoder 138. And an audio decoder 139, a display unit 140, and a speaker 141.

The receiver 131 receives a digital broadcast wave through which a digital broadcast data of a plurality of programs is multiplexed and transmitted through a broadcast channel. The receiver 131 restores the received digital broadcast data to the original transmission stream through demodulation and error correction. The recovered transport stream is a stream of a channel selected by the user.

The demultiplexer (TS DEMUX) 132 may include a section filter. The demultiplexer 132 demultiplexes a transport stream and separates transmission packets of digital broadcast data corresponding to a program selected by a user. The separated transmission packet includes at least one of audio data, video data, and additional data according to the type of program.

The limited receiver 135 includes a descrambler 137 and a descramble key decrypter 136, and encrypts the digital broadcast data by using the descramble key decrypted by the descramble key decrypter 136. Decrypt, ie descramble.

At this time, to generate the authentication key, the authentication unit 134 requests authentication to the broadcasting center 110 by using the wireless Internet network 120, and upon authentication request, the MIN and ESN information stored in the terminal information storage unit 133 are requested. The transmission is performed using the wireless internet network 120. Then, the encrypted descramble key according to the authentication is received from the authentication server 112 of the broadcasting center 110. The received descramble key is transmitted to the descramble key decryption unit 136.

The descramble key decrypts the encrypted descramble key received from the authentication unit 134 using MIN and ESN information stored in the terminal information storage unit 133. When the decrypted descramble key is generated, the descrambler 228 is transmitted to descramble the digital broadcast data.

The descrambled digital broadcast data is decoded through the video decoder 138 and the audio decoder 139, respectively, and output through the display unit 140 and the speaker 141.

In this case, the subscriber package includes a basic channel and a premium package. The basic channel is a channel that can be viewed by both DMB subscribers and transmits scrambled content through this channel, and can be viewed when the subscriber is authenticated. The premium channel is a pay per view (PPV) service, which transmits scrambled broadcast content and requires IPPV (Impulse PPV) certification in addition to subscriber authentication. The wireless Internet is used as a callback channel of the IPPV service and an IPPV server should be established in the broadcasting center 110. The security level of the DBM authentication level depends on the security level of the wireless Internet.

3 is a flowchart illustrating a method for operating a digital multimedia broadcasting restriction system using the wireless Internet of the present invention.

Referring to FIG. 3, the broadcast center 110 transmits scrambled broadcast data to the mobile communication terminal 130 through a broadcast channel (S101).

The mobile communication terminal 130 requests authentication to the broadcasting center 110 by the subscriber (S102), and the terminal information is transmitted to the broadcasting center 110 through the wireless Internet network 120 by the authentication request (S102). S103,104).

The broadcast center 110 performs subscriber authentication using the terminal information (S105). When subscriber authentication is completed, the broadcast center 110 encrypts a descramble key using the terminal information (S106). The encrypted descramble key is transmitted to the mobile communication terminal through the wireless Internet network 120 (S107, S108).

After receiving the encrypted descramble key, the mobile communication terminal 130 decrypts it using terminal information (S109), and then descrambles scramble broadcast data using the decrypted descramble key (S110). Decode and play (S111).

4 is an operation flowchart of a broadcasting center according to the present invention. Referring to FIG. 4, scramble broadcast data is transmitted through a broadcast channel (S121). Thereafter, it is checked whether there is an authentication request from the terminal (S122), and if there is an authentication request, the MIN and ESN information of the terminal is received through the wireless Internet (S123). Subscriber authentication is performed using the received MIN and ESN information of the terminal (S124). When the subscriber authentication is completed, the descramble key is encrypted using the MIN and ESN information of the terminal (S125). The encrypted descramble key is transmitted to the terminal through the wireless Internet (S126).

5 is an operation flowchart of a mobile communication terminal according to the present invention.

Referring to FIG. 5, when digital broadcast data is received, demultiplexing is performed (S131 and S132). At this time, the presence or absence of an authentication key such as a descramble key is checked (S133). If there is no authentication key, a request is made to the broadcasting center by using the wireless Internet. When the authentication request, the MIN and ESN information of the terminal is transmitted to the broadcasting center (S134).

Subsequently, upon receiving the encrypted descramble key according to the authentication result from the broadcasting center (S135), the encrypted descramble key is decrypted using the MIN and ESN information of the terminal (S136). The descrambled key is used to descramble the digital broadcast data (S137), and to decode and reproduce the descrambled data (S138).

Here, in the present invention, any one or both of MIN and ESN information of the terminal can be used to be used for authentication, encryption and decryption of the descramble key of the terminal.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, according to the digital multimedia broadcasting limited reception system and method using the wireless Internet, the wireless Internet subscriber authentication system and the DMB subscriber authentication system can be integrated for the subscriber authentication of the mobile communication terminal.

The present invention has the effect of not using a separate smart card for terminal subscriber authentication.

Claims (6)

A wireless internet network for transmitting and receiving information on limited reception of a subscriber; Receiving the broadcast server and scrambled broadcast data transmitted through a broadcast channel, and receives the subscriber's limited reception information through the wireless Internet network and encrypts the subscriber authentication and descramble key using the received received reception information and transmits A broadcast center including an authentication server; An authentication key decryption unit for decrypting the encrypted descramble key received through the wireless Internet network using the limited reception information of the subscriber, a descrambler for descrambling the scrambled broadcast data received through the broadcast channel; A mobile communication terminal including an authentication unit for transmitting the limited reception information of the subscriber through the wireless Internet and receiving the encrypted descramble key; Digital multimedia broadcasting limited reception system using the wireless Internet, comprising a. The method of claim 1, The limited reception information of the subscriber is a digital multimedia broadcasting limited reception system using a wireless Internet, characterized in that the mobile communication terminal has a MIN (Mobile Identification Number) and / or Electronic Serial Number (ESN). The method of claim 1, The authentication server encrypts a descrambling key for descrambling the scrambled broadcast data using MIN and / or ESN information of a terminal, And the descrambling key decryption unit decrypts the encrypted descrambling key using MIN and / or ESN information of a terminal. Receiving scrambled digital broadcast data through a broadcast channel transmitted from a broadcast center in a mobile communication terminal; A scrambling key for transmitting limited reception information to a broadcasting center through a wireless Internet network in the mobile communication terminal, performing authentication by receiving the limited reception information in a broadcasting center, and receiving the scrambling digital broadcast data for an authenticated subscriber. Encrypting and transmitting the data to the mobile communication terminal through the wireless Internet; And after receiving the encrypted scrambling key by the mobile terminal, decrypting using the limited reception information, and then descrambles the scrambling digital broadcast data using the decrypted scrambling key. Restriction receiving method of digital multimedia broadcasting using wireless internet. The method of claim 4, wherein The limited reception information of the subscriber is a digital multimedia broadcasting limited reception method using wireless Internet, characterized in that the mobile communication terminal (MIN) and / or Electronic Serial Number (ESN) information that the mobile terminal has. The method of claim 5, The mobile communication terminal encrypts a descrambling key for descrambling the scrambled broadcast data using MIN and / or ESN information of the terminal, and encrypts the descrambling key using MIN and / or ESN information of the terminal. And receiving decryption of the descrambled key.

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