CN101442660B - System for receiving download type digital television condition and dynamic download method thereof - Google Patents
System for receiving download type digital television condition and dynamic download method thereof Download PDFInfo
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Abstract
The invention discloses a download type conditional access system for digital televisions and a dynamic download method thereof. The conditional access system overcomes the defects of the safety and universality of the prior conditional access system, and has the advantages of high safety, strong universality and so on; and a structure of the conditional access system comprises an algorithm generation module, the module is connected with an algorithm broadcasting module, the algorithm broadcasting module is connected with a conditional access front-end module and digital television front-end equipment, and the digital television front-end equipment is connected with a conditional access terminal module, wherein the algorithm generation module is responsible for generating a conditional access algorithm used by the conditional access front-end module and the conditional access terminal module, and the conditional access front-end module and the conditional access terminal module dynamically download corresponding to dynamic algorithm execution to finish the conditional access of the digital televisions.
Description
Technical field
The present invention relates to digital TV field (comprising wired, satellite, ground, mobile digital TV and IPTV etc.) and mobile multimedia technical field, relate in particular to a kind of system for receiving download type digital television condition and dynamic download method thereof that uses under to digital audio, video data encipherment protection condition.
Background technology
Condition reception (Conditional Access is called for short CA) system is meant and is used for controlling the system that the user receives digital television business that promptly the user can only watch the digital television program (containing audio frequency, video, data etc.) through authorizing.Its basic purpose is that operator carries out authorization control and empowerment management to the user in television system, thereby realizes the paid service of digital television system.
In digital television system, operator utilizes condition receiving system to transmit in broadcasting network after the TV programme of broadcasting is encrypted, receiving terminal (user) only obtain under the situation that operator authorizes could watching encrypted TV programme.Operator can utilize condition receiving system that various value-added services such as pay TV programs, video request program, information service, the Internet are provided, condition receiving system is that operator carries out value-added service, increasing income originates provides the necessary technology assurance, thereby it is basic to become in the digital television system one, also is most important component.
But in the last few years, advancing by leaps and bounds of computer technology and digital technology proposed new challenge and requirement to condition receiving system, and existing condition receiving system and technology expose some fatal weakness gradually.
1, fail safe is low
Existing condition receiving system receiving terminal adopts smart card, decipherment algorithm is just in smart card, decrypting process is that ciphered data is delivered in the smart card, and the key after smart card will be deciphered passes in the receiving terminal, is transferred in the descrambler by the CA module in the receiving terminal again.The CA module is embedded in the set-top box software framework as an independent parts.The shortcoming of this conventional art is can intercept condition receiving algorithm key in a plurality of places such as between smart card and the receiving terminal, between CA module and the descrambler, has caused hidden danger on safety.
In addition, existing smart card CA system, the communication between smart card and the set-top box (for example session communication such as command format) is fixed in set-top box and smart card basically, even change, also is variation seldom.Like this, for the big CA system of issued volume,, also have no idea to remedy even CA supplier has known that algorithm is cracked.
2, versatility is poor
The mass part of existing condition receiving system need hold in close confidence, because it is to improve fail safe by very strong private ownership, each CA supplier maintains secrecy to the data of oneself as much as possible, set-top box producer is difficult to a plurality of CA are integrated in the set-top box, has caused set-top box very not general.
In addition, CA supplier is difficult to provide at each operator the CA system of differentiation, the CA algorithm that CA supplier provides at all operators all is the same, and after the CA that uses in one of them operator was cracked, all operators all can be affected.
3, cost height
The existence conditions receiving system is solidificated in decipherment algorithm in the conditional access terminal, in case decipherment algorithm is cracked, CA supplier also can not make effective counter-measure.In order to guarantee benefits of operators, can only change the decipherment algorithm that condition receiving system uses,, can not dynamically update because algorithm is solidificated in the conditional access terminal, can only realize that the replacing condition receives the algorithm that uses, and will cause very big cost price like this by changing receiving terminal.For the CA system that has a large number of users, all changing conditional access terminal is impossible realize substantially, and the cost price of paying also will be huge.
Summary of the invention
Purpose of the present invention is exactly that the fail safe of existence conditions receiving system is low, cost is high, the defective of versatility difference aspect in order to solve, and proposes a kind of download type condition receiving system and handling process thereof of high safe, low-cost, strong versatility.Except high safety, low cost, strong versatility, this condition receiving system biggest advantage also is dynamically down loading updating of condition receiving algorithm, by regular update condition receiving algorithm, can improve the fail safe of condition receiving system greatly.This condition receiving system can provide different condition receiving units at different operators, even the CA of one of them operator is cracked like this, also can not influence other operators, has improved fail safe.In addition, operator can be by the dynamic download of condition receiving algorithm after learning that CA is cracked, timely replacing condition receiving algorithm, and need not to change conditional access terminal, and so just do not increasing the fail safe that has guaranteed CA under the condition of cost, guaranteed benefits of operators.
The present invention adopts following technical scheme for achieving the above object:
A kind of system for receiving download type digital television condition, it comprises an algorithm generation module, this module is broadcast module with algorithm and is connected, and algorithm is broadcast module and is connected with digital television front equipment with the condition receiving front-end module, and digital television front equipment is connected with the conditional access terminal module; Wherein, the algorithm generation module is responsible for the condition receiving algorithm of formation condition receiving front-end module and the use of conditional access terminal module, the dynamic algorithm of condition receiving front-end module and conditional access terminal module dynamic download correspondence is carried out, and finishes the Conditional Access of Digital Television.
Described algorithm generation module is a computer, and its generates front-end algorithm file and terminal algorithm file, and sends to algorithm behind the two algorithm file encryptions that will generate and broadcast module.
It is to be furnished with the computer or the server of code flow broadcast card that described algorithm is broadcast module, it is updated to the condition receiving front-end module by the front-end algorithm update module with the front-end algorithm file of receiving, broadcasts module by terminal algorithm the terminal algorithm file of receiving is updated to the conditional access terminal module.
Described condition receiving front-end module is the CA server, and the CA server comprises Entitlement Control Message generator and Entitlement Management Message generator, and this module and digital television front equipment are finished together to the control of program with to user's management.
Described conditional access terminal module is digital TV set-top box or digital TV integrated machine or digital television intelligent card, and this module dynamic download execution algorithm is broadcast the condition receiving algorithm that module is broadcast, and the safety condition of finishing scrambled program receives.
A kind of dynamic download method of system for receiving download type digital television condition, its step is:
1) the front-end algorithm generation module of algorithm generation module compiles, is connected with the algorithm that the conditional access terminal module is used the algorithm that the condition receiving front-end module uses respectively with the terminal algorithm generation module, generate front-end algorithm file and terminal algorithm file, and broadcast module sending to algorithm behind the algorithm file encryption that generates;
2) algorithm is broadcast the front-end algorithm update module of module and terminal algorithm and is broadcast module the front-end algorithm file of receiving is updated to the condition receiving front-end module, and the terminal algorithm file is updated to the conditional access terminal module;
3) condition receiving front-end module and digital television front equipment are finished together to the control of program with to user's management, make to the program of scrambling have the user of mandate to watch, not have the user of mandate to watch;
4) conditional access terminal module dynamic download execution algorithm is broadcast the condition receiving algorithm that module is broadcast, and the safety condition of finishing scrambled program receives;
For guaranteeing that the condition receiving system algorithm that front end is broadcast is not illegally used, conditional access terminal module legitimacy is verified, guarantee that illegal conditional access terminal can't use this part.
In the described step 1), described front-end algorithm file generative process is, the front-end algorithm generation module uses SDK (Software Development Kit) that the algorithm that the condition receiving front-end uses is compiled, connects, generate the dll dynamic library file, after the front-end algorithm generation module generates the front-end algorithm file, it is encrypted, and the front-end algorithm file after will encrypting by VPN or Local Net sends to algorithm and broadcasts module;
Described terminal algorithm file generative process is, the terminal algorithm generation module uses software development environment that the algorithm that conditional access terminal uses is compiled, connects, generate the binary system bin file, after the terminal algorithm generation module generates the terminal algorithm file, with its encryption, and the file after will encrypting is packaged into the TS file, and the TS file after will encrypting by VPN or Local Net then sends to algorithm and broadcasts module.
Described step 2) in, the front-end algorithm update module sends to the condition receiving front-end module with the front-end algorithm file of the encryption that the algorithm generation module sends by VPN or Local Net; Terminal algorithm is broadcast module and is used code stream to broadcast the TS file that card broadcast algorithm generation module is sent, and by code stream distributor, multiplexer, modulator, the terminal algorithm file of TS document form is sent to the conditional access terminal module by digital TV network.
In the time of described condition receiving front-end module receiving front-end algorithm file, at first the encryption front-end algorithm file that receives is decrypted, upgrades the condition receiving front-end algorithm that is using with the front-end algorithm after the deciphering then.
After described conditional access terminal module receives the terminal algorithm file by digital TV network, deciphering terminal algorithm file, and the terminal algorithm file after will deciphering is saved in the conditional access terminal module, do not replace the conditional access terminal algorithm that is using, there are two kinds of terminal algorithm simultaneously in the conditional access terminal module like this, the terminal algorithm descrambling data that the version information of the algorithm that uses according to the condition receiving front-end in the process of descrambling, conditional access terminal are selected from these two kinds of terminal algorithm and front-end algorithm is mated.
More preferably, described system also comprises the unified management software Subscriber Management System of above-mentioned four modules, finishes management and record that algorithm is generated, broadcasts, upgrades; Do the good algorithm updating strategy; The scheduling that algorithm upgrades is set.Not influence the renewal of finishing the algorithm that condition receiving front-end and conditional access terminal use under the situation that the user uses, the fail safe that improves condition receiving system to the full extent.
The present invention has taken into full account the fail safe of system from the condition receiving front-end to conditional access terminal, among the present invention, the condition receiving unit all can dynamic download upgrade concerning conditional access terminal.Because the current chip nearly all download of support code is carried out, and dynamically issues the renewal that the CA algorithm just can be realized described condition receiving system algorithm very much by digital TV front-end.Maintain in the time of certain weak point when this update time, make when this time is shorter than the time that algorithm is cracked, cracking of cryptographic algorithm just lost meaning, and this has more increased the fail safe of condition receiving system.In addition because receiving terminal condition receiving unit can be downloaded execution, so in different areas, at different digital-TV operator, the receiving terminal of identical software and hardware condition can be downloaded and carry out different condition receiving units, thereby has increased the versatility of receiving terminal and this condition receiving system.
The invention has the beneficial effects as follows: safe, cost is low, and versatility is good, and designs simplification is easy to use.
Description of drawings
Fig. 1 is a download type condition receiving system structural representation of the present invention;
Fig. 2 is the download flow process of download type condition receiving system condition receiving unit of the present invention;
Fig. 3 is a download type condition receiving front-end algorithm file generative process of the present invention;
Fig. 4 is a download type conditional access terminal algorithm file generative process of the present invention;
Wherein, 1. algorithm generation module, 11. front-end algorithm generation modules, 12. terminal algorithm generation modules, 2. algorithm is broadcast module, 21. front-end algorithm update module, and 22. terminal algorithm are broadcast module, 3. condition receiving front-end module, 4. conditional access terminal module, 5. digital television front equipment.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Fig. 1 is a download type condition receiving system structural representation of the present invention, wherein algorithm generation module 1 is responsible for the algorithm that condition receiving front-end module 3 and conditional access terminal module 4 are used is compiled, is connected, generate front-end algorithm file and terminal algorithm file, and the file that generates is sent to algorithm broadcast module 2; Algorithm is broadcast module 2 and is responsible for by VPN or Local Net the front-end algorithm file of receiving being sent to condition receiving front-end module 3, utilize digital television front equipments 5 such as scrambler, multiplexer, modulator, the terminal algorithm file is sent to conditional access terminal module 4 by digital TV network; Condition receiving front-end module 3 produces digital television front equipments 5 such as Entitlement Control Messages and Entitlement Management Message and scrambler, multiplexer, modulator and cooperates and finish to the control of program with to user's management; But conditional access terminal module 4 dynamic download execution algorithms are broadcast the condition receiving algorithm that module 2 is broadcast, and the safety condition of finishing scrambled program receives.
Fig. 2 is the download flow process of download type condition receiving system condition receiving unit of the present invention.Step is as follows:
(1) algorithm generation module 1 utilizes the algorithm of 11 pairs of condition receiving front-end modules of front-end algorithm generation module, 3 uses to compile, connect, generate the front-end algorithm file, after to the front-end algorithm file encryption, by VPN or Local Net the front-end algorithm file of encrypting is sent to algorithm and broadcast module 2; The algorithm that algorithm generation module 1 utilizes 12 pairs of conditional access terminal modules of terminal algorithm generation module 4 to use compiles, connects, generate the terminal algorithm file, and the terminal algorithm file that generates encrypted, and then the terminal algorithm file of encrypting is packaged into the TS file, by VPN or Local Net the TS file that generates is sent to algorithm and broadcast module 2.
(2) after algorithm was broadcast module 2 and received the front-end algorithm file of the encryption that algorithm generation module 1 sends, front-end algorithm update module 21 sent to condition receiving front-end module 3 with the front-end algorithm file of encrypting by VPN or Local Net; After algorithm is broadcast module 2 and is received the terminal algorithm TS file that algorithm generation module 1 sends, terminal algorithm is broadcast module 22 and is utilized code flow broadcast card playback terminal algorithm TS file, by digital television front equipments 5 such as scrambler, multiplexer, modulators the terminal algorithm file is issued in the digital TV network, and then sends to conditional access terminal module 4.
(3) after conditional access terminal module 4 has been downloaded the terminal algorithm file from digital TV network, the terminal algorithm file of downloading is decrypted, and the terminal algorithm file after will deciphering is saved in conditional access terminal, but do not replace the conditional access terminal algorithm file that is using immediately, just there are two kinds of terminal algorithm files simultaneously in conditional access terminal like this.Two kinds of terminal algorithm files in the conditional access terminal module 4 all have the version information of oneself, mate to determine to use any terminal algorithm that scrambled program is carried out safe condition by the version information with the front-end algorithm file and receive.
(4) after conditional access terminal module 4 is finished the reception of terminal algorithm file, 3 pairs of condition receiving front-end modules are broadcast the front-end algorithm file that module 2 receives from algorithm and are decrypted, and replace the front-end algorithm file that condition receiving front-end module 3 is using with the front-end algorithm file after the deciphering.So far, what condition receiving front-end module 3 and conditional access terminal module 4 were used all is new condition receiving algorithm, and the renewal of condition receiving algorithm is finished.
Fig. 3 is a download type condition receiving front-end algorithm file generative process of the present invention, and process is as follows:
1) the front-end algorithm code is compiled, connect, generate the front-end algorithm file;
2) the front-end algorithm file that generates is encrypted, generated the front-end algorithm file of encrypting.
Fig. 4 is a download type conditional access terminal algorithm file generative process of the present invention, and process is as follows:
1) the terminal algorithm code is compiled, connect, generate the terminal algorithm file;
2) the terminal algorithm file that generates is encrypted, generated the terminal algorithm file of encrypting;
3) the terminal algorithm file of encrypting is packed, generate the TS file.
The receiving algorithm of condition described in the present invention can be to meet all algorithms that condition receiving system is encrypted in the DVB organization condition receiving system standard, deciphering requires.
Claims (10)
1. system for receiving download type digital television condition, it is characterized in that, it comprises an algorithm generation module (1), this module is broadcast module (2) with algorithm and is connected, algorithm is broadcast module (2) and is connected with digital television front equipment (5) with condition receiving front-end module (3), and digital television front equipment (5) is connected with conditional access terminal module (4); Wherein, algorithm generation module (1) is responsible for the condition receiving algorithm of formation condition receiving front-end module (3) and conditional access terminal module (4) use, the dynamic algorithm of condition receiving front-end module (3) and conditional access terminal module (4) dynamic download correspondence is carried out, and finishes the Conditional Access of Digital Television.
2. system for receiving download type digital television condition as claimed in claim 1, it is characterized in that, described algorithm generation module (1) is a computer, and its generates front-end algorithm file and terminal algorithm file, and sends to algorithm behind the two algorithm file encryptions that will generate and broadcast module (2).
3. system for receiving download type digital television condition as claimed in claim 1 or 2, it is characterized in that, described algorithm is broadcast module (2) for being furnished with the computer or the server of code flow broadcast card, it is updated to condition receiving front-end module (3) by front-end algorithm update module (21) with the front-end algorithm file of receiving, broadcasts module (22) by terminal algorithm the terminal algorithm file of receiving is updated to conditional access terminal module (4).
4. system for receiving download type digital television condition as claimed in claim 1, it is characterized in that, described condition receiving front-end module (3) is the CA server, the CA server comprises Entitlement Control Message generator and Entitlement Management Message generator, and this module and digital television front equipment (5) are finished together to the control of program with to user's management.
5. system for receiving download type digital television condition as claimed in claim 1, it is characterized in that, described conditional access terminal module (4), be digital TV set-top box or digital TV integrated machine or digital television intelligent card, this module dynamic download execution algorithm is broadcast the condition receiving algorithm that module (2) is broadcast, and the safety condition of finishing scrambled program receives.
6. the dynamic download method of the described system for receiving download type digital television condition of claim 1 is characterized in that, its step is:
1) the front-end algorithm generation module (11) of algorithm generation module (1) compiles, is connected with the algorithm that conditional access terminal module (4) is used the algorithm that condition receiving front-end module (3) uses respectively with terminal algorithm generation module (12), generate front-end algorithm file and terminal algorithm file, and broadcast module (2) sending to algorithm behind the algorithm file encryption that generates;
2) algorithm is broadcast the front-end algorithm update module (21) of module (2) and terminal algorithm and is broadcast module (22) the front-end algorithm file of receiving is updated to condition receiving front-end module (3), and the terminal algorithm file is updated to conditional access terminal module (4);
3) condition receiving front-end module (3) and digital television front equipment (5) are finished together to the control of program with to user's management, make to the program of scrambling have the user of mandate to watch, not have the user of mandate to watch;
4) conditional access terminal module (4) dynamic download execution algorithm is broadcast the condition receiving algorithm that module (2) is broadcast, and the safety condition of finishing scrambled program receives;
For guaranteeing that the condition receiving system algorithm that front end is broadcast is not illegally used, conditional access terminal module (4) legitimacy is verified, guarantee that illegal conditional access terminal can't use this part.
7. the dynamic download method of system for receiving download type digital television condition as claimed in claim 6, it is characterized in that, in the described step 1), described front-end algorithm file generative process is, front-end algorithm generation module (11) uses SDK (Software Development Kit) that the algorithm that the condition receiving front-end uses is compiled, connects, generate the dll dynamic library file, after front-end algorithm generation module (11) generates the front-end algorithm file, it is encrypted, and the front-end algorithm file after will encrypting by VPN or Local Net sends to algorithm and broadcasts module (2);
Described terminal algorithm file generative process is, terminal algorithm generation module (12) uses software development environment that the algorithm that conditional access terminal uses is compiled, connects, generate the binary system bin file, after terminal algorithm generation module (12) generates the terminal algorithm file, with its encryption, and the file after will encrypting is packaged into the TS file, and the TS file after will encrypting by VPN or Local Net then sends to algorithm and broadcasts module (2).
8. the dynamic download method of system for receiving download type digital television condition as claimed in claim 6, it is characterized in that, described step 2) in, front-end algorithm update module (21) sends to condition receiving front-end module (3) with the front-end algorithm file of the encryption that algorithm generation module (1) sends by VPN or Local Net; Terminal algorithm is broadcast module (22) and is used code stream to broadcast the TS file that card broadcast algorithm generation module (1) is sent, by code stream distributor, multiplexer, modulator, the terminal algorithm file of TS document form is sent to conditional access terminal module (4) by digital TV network.
9. the dynamic download method of system for receiving download type digital television condition as claimed in claim 8, it is characterized in that, in the time of described condition receiving front-end module (3) receiving front-end algorithm file, at first the encryption front-end algorithm file that receives is decrypted, upgrades the condition receiving front-end algorithm that is using with the front-end algorithm after the deciphering then.
10. the dynamic download method of system for receiving download type digital television condition as claimed in claim 8, it is characterized in that, after described conditional access terminal module (4) receives the terminal algorithm file by digital TV network, deciphering terminal algorithm file, and the terminal algorithm file after will deciphering is saved in conditional access terminal module (4), do not replace the conditional access terminal algorithm that is using, there are two kinds of terminal algorithm simultaneously in conditional access terminal module (4) like this, the terminal algorithm descrambling data that the version information of the algorithm that uses according to the condition receiving front-end in the process of descrambling, conditional access terminal are selected from these two kinds of terminal algorithm and front-end algorithm is mated.
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| CN102291591B (en) * | 2011-06-24 | 2013-11-06 | 广州视源电子科技股份有限公司 | Television software function compilation-free configuration method and device thereof |
| CN107566112A (en) * | 2016-06-30 | 2018-01-09 | 中国电信股份有限公司 | Dynamic encryption and decryption method and server |
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