WO2014019336A1

WO2014019336A1 - Multi-ca simulcrypt system and method

Info

Publication number: WO2014019336A1
Application number: PCT/CN2013/000872
Authority: WO
Inventors: 陶圣华
Original assignee: 山东泰信电子股份有限公司
Priority date: 2012-07-30
Filing date: 2013-07-22
Publication date: 2014-02-06
Also published as: CN102761777A; CN102761777B

Abstract

Disclosed is a multi-CA simulcrypt system, comprising: a CA common server, several CA servers, a scrambling machine and several digital television terminals, wherein the CA servers perform two-way communication with the CA common server, the CA common server performs two-way communication with the scrambling machine, and the scrambling machine performs one-way communication with the digital television terminals. The CA common server receives a control word from the scrambling machine, and sends the control word to the CA server connected thereto; at the same time, the CA common server processes received entitlement control information and entitlement management information from the CA server to generate new entitlement control information and entitlement management information, and sends the new entitlement control information and entitlement management information to the scrambling machine; and the scrambling machine sends the received entitlement control information and entitlement management information to the digital television terminals. The present invention adds or replaces a simulcrypt CA system simply and conveniently without setting and debugging again, and solves the problem of limitation on the number of simulcrypt CA systems.

Description

Multi-CA co-secret system and method

The present invention relates to the field of digital television technologies, and in particular, to a multi-CA co-secret system and method.

Background technique

Simultaneous encryption is an encryption method for digital television. It means that two or more CA (Conditional Access) systems scramble or encrypt the same TS stream. The same confidentiality standard for DVB-CA systems requires that all CA vendors must comply with CSA (Common Scrambling Algorithm) to add/remove video, audio, and data information. At the same time, all CA vendors must develop their own The ECM (Entitlement Control Message) and EMM (Entitlement Management Message) control programs are used to implement authorization control and management of the user's set top box. The same density allows multiple CA systems in the same operating network. Users can watch the same program with different terminals, which is beneficial to fair competition among CA manufacturers and improve technology and service levels.

At present, the CA secret mode is mainly for connecting multiple CA servers to the same scrambler. The scrambler uses CW (Control Word, Control Word) to scramble/encrypt the TS stream, and sends the CW to the connected network. Each CA server, the CA server generates ECM and EMM data according to the CW and the user information and sends the data to the scrambler. The scrambler multiplexes the ECM, EMM and TS streams and sends them to the terminal through the broadcast television network. This method can achieve the same density of multiple CA systems, but there are certain defects. Because the interface between the scrambler and the CA server is limited, the number of CA servers that can be connected is limited, which in turn results in a limited number of CA systems that can be densely coupled. In addition, in the current secret mode, each time a CA system is added or replaced, it is necessary to change the same density setting of the scrambler and re-commission it, and often there are a lot of problems during the debugging process, adding or It is very troublesome to replace the same dense CA system.

Summary of the invention

The object of the present invention is to solve the problem that the number of the same dense CA system existing in the same dense mode is limited, the increase or replacement of the same dense CA system is troublesome and often error, and the like, and a multi-CA same-density system and method are proposed. The CA system can be added or replaced simply and conveniently, without re-setting the scrambler, and the number of co-located CA systems can be limited by the number of scrambler interfaces.

In order to achieve the above object, the present invention adopts the following technical solutions:

A multi-CA co-secret system comprising: a CA public server, a plurality of CA servers, a scrambler, and a number of digital television terminals, wherein:

The CA server communicates with the CA public server in two directions; the CA public server communicates with the scrambler in two directions; the scrambler communicates with the digital television terminal in one direction; The CA public server receives the control word from the scrambler and sends the control word to the CA server connected to it; meanwhile, the CA public server processes the received authorization control information and authorization management information from the CA server to generate a new authorization. Control information and authorization management information, and send new authorization control information and authorization management information to the scrambler;

The scrambler sends the received authorization control information and authorization management information to the digital television terminal.

The same density method of multi-CA and the same secret system, its steps are:

1) The scrambler generates a control word, and sends the control word to the CA public server, and the CA public server sends the control word to each CA server connected thereto;

2) each CA server generates authorization control information according to the control word and sends it to the CA public server; at the same time, each CA server also generates authorization management information and sends it to the CA public server;

3) The CA public server respectively adds a corresponding authorization control information descriptor before each authorization control information, and adds each authorization control information combination after the authorization control information descriptor to generate new authorization control information;

At the same time, the CA public server also adds a corresponding authorization management information descriptor before each authorization management information, and adds each authorization management information after the authorization management information descriptor as new authorization management information;

4) The CA public server sends the new authorization control information and the new authorization management information to the scrambler;

5) The scrambler multiplexes the received new authorization control information with the new authorization management information with the program stream, and sends the new authorization control information to the digital television terminal;

6) The digital television terminal receives and analyzes the new authorization control information and the new authorization management information, and completes the conditional reception of the program.

In the step 3), the authorization control information descriptor includes at least an ID identifier of a CA system that generates the authorization control information.

In the step 3), the authorization management information descriptor includes at least an ID identifier of a CA system that generates the authorization management information.

In the step 6), the authorization control information receiving parsing process is:

S301: The digital television terminal receives the authorization control information:

S302: Parsing the authorization control information, determining whether there is an authorization control information descriptor in the authorization control information, if yes, executing step S303; if not, executing step S301;

S303: determining whether there is a CA system ID identifier in the authorization control information that is consistent with the digital television terminal CA system ID identifier, if yes, executing step S304; if not, executing step S301;

S304: Parsing data corresponding to the ID of the CA system ID of the digital television terminal in the authorization control information, and obtaining a control word, Complete the analysis.

In the step 6), the authorization management information receiving parsing process is:

S401: The digital television terminal starts to receive the authorization management information action;

S402: Set a filter filter according to an ID identifier of a CA system of the digital television terminal;

S403: determining whether the authorization management information data is received, if yes, executing step S404; if not, performing step S401;

S404: Parse the authorization management information.

The invention has the beneficial effects that: the invention adds a CA public server between the scrambler and each CA server, and the CA public server receives the control word sent by the scrambler and sends it to each CA server, and at the same time, the CA public server receives The authorization control information and the authorization management information sent by each CA server are processed to generate new authorization control information and authorization management information and then sent to the scrambler. For the scrambler, the CA public server can be regarded as a CA server, the scrambler does not care about the number of CA systems in the same density, and solves the problem of the limited number of cohesive CA systems caused by the limited interface of the scrambler. At the same time, when adding or replacing the same-density CA system, There is no need to change and re-tune the scrambler with the same settings, and there is no problem with adding or replacing the same-density CA system. It is simple and convenient to add or replace the same-density CA system. In addition, the present invention processes and combines the ECM data sent by the same-secret CA system through the CA public server, which can reduce the bandwidth occupied by the same-secret ECM data, and reduce the impact on the program stream due to the increase of the same-secret CA system and the increase of the ECM data. .

DRAWINGS

1 is a schematic structural view of the system of the present invention;

2 is a flow chart of generating authorization control information according to the present invention;

3 is a flow chart of generating authorization management information according to the present invention;

4 is a flowchart of analyzing authorization control information received by the present invention;

FIG. 5 is a flowchart of analyzing authorization management information received by the present invention; FIG.

6 is a schematic structural diagram of authorization control information generated by a CA public server according to the present invention;

FIG. 7 is a schematic structural diagram of authorization management information generated by the CA public server according to the present invention.

detailed description

The invention will be further described below in conjunction with the drawings and embodiments.

The drawings are intended to provide a further understanding of the invention, and are intended to be illustrative of the invention.

As shown in Figure 1, a multi-CA co-secret system, which includes -

CA public server, several CA servers, scramblers, and several digital TV terminals, where: The CA server communicates with the CA public server in two directions; the CA public server communicates with the scrambler in two directions; the scrambler communicates with the digital television terminal in one direction.

The CA public server receives the control word from the scrambler and sends the control word to the CA server connected thereto; meanwhile, the CA public server processes the received authorization control information and authorization management information from the CA server to generate a new Authorization control information and authorization management information, and send new authorization control information and authorization management information to the scrambler.

As shown in Figure 2, the authorization control information generation process in the multi-CA and the same-secret method is:

S101: The scrambler generates a control word CW, sends the control word CW to the CA public server, and scrambles the data transmission stream by using the control word CW;

S102: The CA public server sends the control word CW to each CA server connected thereto, and each CA server is sequentially labeled as CA, CA _n ;

S103: each CA server C, ..., CA _n generates authorization control information ..., ECM _n according to the control word CW, and sends it to the CA public server;

S104: The CA public server separately adds a corresponding authorization control information descriptor before each authorization control information ECIVU, . . . , ECM _n , and combines each authorization control information after the authorization control information descriptor is added to generate a new authorization control. The information ECM is sent to the scrambler; the authorization control information descriptor includes at least an ID identifier of the CA system that generates the authorization control information;

S105: The scrambler sends the received authorization control information ECM to the digital television terminal together with the scrambled data transmission stream.

The n is a natural number greater than one.

As shown in Figure 3, the authorization management information generation process in the multi-CA and the same-secret method is:

S201: Each CA server CA ..., [4. Generate authorization management information EMM..., EMM _n and send it to the CA public server respectively;

S202: The CA public server adds a corresponding authorization management information descriptor before each authorization management information EMIV, . . . , EMM _n , and adds each authorization management information of the authorization management information descriptor as the new authorization management information EMMi', EMM _n ' is sent to the scrambler; the authorization management information descriptor includes at least an ID identifier of the CA system that generates the authorization management information;

S203: The scrambler sends the received authorization management information ...... ......, EMM _n ' to the digital television terminal together with the scrambled data transmission stream;

As shown in Figure 4, the authorization control information receiving resolution process in the multi-CA and the same-secret method is:

S301: The digital television terminal receives the authorization control information ECM; S302: parsing the authorization control information ECM, determining whether there is an authorization control information descriptor in the authorization control information ECM, if yes, executing step S303; if not, executing step S301;

S304: Parsing the authorization control information, the data corresponding to the ID of the CA system identifier of the digital television terminal in the ECM, and obtaining the control word CW;

S305: De-scrambling the scrambled data by using the control word CW, and playing the scrambled program;

As shown in Figure 5, the authorization management information receiving resolution process in the multi-CA and the same-secret method is:

S403: determining whether the authorization management information data is received, if it is received, indicating that the authorization management information corresponds to the digital television terminal CA system ID identifier, and executing step S404; otherwise, executing step S401;

S404: Parse the authorization management information.

As shown in FIG. 6, the authorization control information generated by the CA public server has the following format: Table ID, ECM Data Length, CASi-ID, ECMi Lengths ECM^, CAS _n -ID, ECM _n Lengths ECM _n , CRC, where,

CAS _r ID, ······, CAS _n -ID are the ID identifiers of the CA systems in which each CA server CAi, ······, CA _n runs;

ECMi Lengths ......, ECM _n Length is the length of each authorization control information ECIV^ ..., £0\/1; n is a natural number greater than 1.

As shown in FIG. 7, the authorization management information format generated by the CA public server is, which in turn includes the following fields: EMM _X Table ID, EMM _X Data Length, CAS _X -ID, EMM _x Data, CRC, where

CAS _X -ID is the ID identifier of the CA system running by the CA server CA _X ;

EMM _X Data removes the data after the Table ID and Length for the authorization management information EMM _X ;

EMM _X Data Length is the sum of the ID identifier of the CA system, the length of the CRC, and the EMM _X Data;

x is 1, ..., n ; n is a natural number greater than 1.

The above is a preferred embodiment of the present invention, and various modifications or variations made on the basis of the technical solutions of the present invention are still within the scope of the present invention.

Claims

Claim

A multi-CA co-secret system, characterized in that it comprises: a CA public server, a plurality of CA servers, a scrambler and a number of digital television terminals, wherein -

The CA server communicates with the CA public server in two directions; the CA public server communicates with the scrambler in two directions; the scrambler communicates with the digital television terminal in one direction;

The CA public server receives the control word from the scrambler and sends the control word to the CA server connected to it; meanwhile, the CA public server processes the received authorization control information and authorization management information from the CA server to generate a new authorization. Control information and authorization management information, and send new authorization control information and authorization management information to the scrambler;

2. A method of similarity using the multi-CA co-density system according to claim 1, wherein the steps are:

5) The scrambler sends the new authorization control information and the new authorization management information to the digital television terminal;

3. The method of claim 2, wherein in the step 3), the authorization control information descriptor includes at least an ID identifier of a CA system that generates the authorization control information.

The same density method according to claim 2, wherein in the step 3), the authorization management information descriptor includes at least an ID identifier of a CA system that generates the authorization management information.

The same density method according to claim 2, wherein in the step 6), the authorization control information receiving parsing process is:

S301: The digital television terminal receives the authorization control information;

S302: Parse the authorization control information, and determine whether the authorization control information descriptor exists in the authorization control information. If yes, Step S303 is performed; if not, step S301 is performed;

S304: Parse the data corresponding to the ID of the CA system identifier of the digital television terminal in the authorization control information, obtain a control word, and complete the analysis.

The same density method according to claim 2, wherein in the step 6), the authorization management information receiving parsing process is:

S404: Parse the authorization management information to obtain authorization information of the digital television terminal.