CN101442659B - Shared digital television condition receiving system capable of preventing CW diffusion and the method - Google Patents
Shared digital television condition receiving system capable of preventing CW diffusion and the method Download PDFInfo
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- CN101442659B CN101442659B CN2008102497348A CN200810249734A CN101442659B CN 101442659 B CN101442659 B CN 101442659B CN 2008102497348 A CN2008102497348 A CN 2008102497348A CN 200810249734 A CN200810249734 A CN 200810249734A CN 101442659 B CN101442659 B CN 101442659B
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Abstract
The invention discloses a conditional access system with CW diffusion sharing prevention for digital televisions and an access method thereof. The invention can substitute the prior conditional access system with a card under the condition of not changing a hardware structure of a conditional access terminal to overcome the defect of the safety of the prior conditional access system with the card. A structure of the conditional access system comprises a front end of the conditional access system with the card and a front end of a non-card conditional access system, wherein the front end of the conditional access system with the card only verifies the validity of the conditional access terminal, and the front end of the non-card conditional access system performs descrambling control of programs after the front end of the conditional access system with the card verifies the validity of the conditional access terminal; the front end of the conditional access system with the card and the front end of the non-card conditional access system are connected with scrambling equipment, the scrambling equipment is connected with a multiplexer and a modulator, and the modulator is connected with the conditional access terminal.
Description
Technical field
The present invention relates in digital TV field (comprising wired, satellite, ground) and the mobile multimedia field digital audio, video and data be carried out the condition receiving system and the method thereof of encipherment protection, provide a kind of and do not changed digital television conditional access system and the method for reseptance thereof of changing the anti-CW diffusion sharing of former conditional access system under the terminal hardware structural condition.
Background technology:
Condition receiving system (Conditional Access System) is to be used for the control figure TV user to use the system of digital television business, and it guarantees that the user can only use the digital television business (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 digital 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 program that broadcasts is encrypted, only obtain the digital television program that user that operator authorizes could watching encrypted in terminal, 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, and increasing income source provides the necessary technology assurance, thus become in the digital television system one basic, also be of paramount importance part.
But in the last few years, advancing by leaps and bounds of computer technology and digital television techniques proposed new challenge and requirement to condition receiving system, and existing condition receiving system and technology expose some fatal weakness gradually.
One, fail safe is low
Digital television conditional access system is mainly based on the DVB standard in Europe before more than 10 years, and its cardinal principle is, the key of a pair of periodicity change is arranged in the digital television signal of encrypting through front end, is called control word (CW).Condition receiving system is responsible for CW is encrypted and is transferred to safely in the decipher of digital television receiving terminal, authorizes the authority of the decipher deciphering of some receiving terminal simultaneously.These have the decipher of authority to decrypt CW, then it are transferred in the descrambler, and descrambler utilizes CW to solve audio and video data streams and plays for playing module.
In this standard of formulation, just considered and how CW was delivered to receiving terminal safely, and do not consider behind the CW that receiving terminal obtains deciphering at that time, and can utilize network technology to carry out diffusion sharing CW, utilized by the bootlegger.This has just become a serious leak of this system under the very flourishing situation of current network technology, and is utilized by the bootlegger, brings serious loss for the Digital Television operator.
Present condition receiving system receiving terminal adopts smart card, and decipherment algorithm is in smart card, and decrypting process is that ciphered data is delivered in the smart card, and smart card is passed the CW that decrypts back receiving terminal again, 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, and the shortcoming of this conventional art is in a plurality of places, and especially the passage between smart card and the receiving terminal can obtain CW, has caused hidden danger on safety.
There is the part of two most important needs to be keep secret in traditional CA company, and one is the algorithm of CA, and another is the CA module.Do not considering under the prerequisite that network is shared, as long as can keep the secret of CA algorithm is not disclosed or is not cracked and can keep the safety of CA system, cracking of CA algorithm is very difficult, cracking of described CA module then is easily, so just can obtain final CW from the passage between smart card and the receiving terminal, share on the network then, walk around cracking of highly difficult CA algorithm easily, break through most of smart card CA system.
Two, upgradability is poor
The another one shortcoming of current condition receiving system is: have security breaches or potential safety hazard even had been found that the condition receiving system of current use, also be difficult to remedy improvement.This is that structure by traditional C A system is determined.Existing smart card CA system goes to support by the set-top box of a large amount of its CA modules of embedding, because the diversity of set-top box master chip, and mainly provide the storehouse by CA producer, set-top box producer is responsible for finishing the integrated of CA module, in case CA producer finds that there is potential safety hazard in CA like this, just needing CA producer to unite each set-top box producer develops integrated again, the set-top box that sends in user's hand is carried out software upgrading, more in addition the smart card that needs will to send in user's hand change again, almost be impossible on this operates concerning operator.
Summary of the invention
Purpose of the present invention is exactly for problems such as the security breaches of the condition receiving system existence that solves current use and potential safety hazards, a kind of existing card article spare receiving system that has of replacing under the condition that does not change the conditional access terminal hardware configuration is provided, has fundamentally solved the digital television conditional access system and the method for reseptance thereof of the anti-CW diffusion sharing of CW diffusion sharing.
For achieving the above object, the present invention has adopted following technical scheme:
A kind of digital television conditional access system of anti-CW diffusion sharing, it includes the card conditional access system front-end and does not have the card conditional access system front-end, the card conditional access system front-end is wherein arranged only to the verifying of conditional access terminal legitimacy, do not have the card conditional access system front-end and after having card conditional access system front-end checking receiving terminal legal, carry out the program descrambling and control; Both all are connected with scrambling equipment, and scrambling equipment is connected with multiplexer, and the equipment of scrambling simultaneously also is connected with modulator, and modulator then is connected with conditional access terminal.
Described conditional access terminal carries out digital TV set-top box or digital TV integrated machine that condition receives for using smart card, it comprises demultiplexing module, it is connected with descrambling module with smart card module respectively, smart card module and authentication module one-way communication, authentication module and descrambling module one-way communication, descrambling module then is connected with playing module.
Described modulator is connected with conditional access terminal by digital TV network.
Described scrambling equipment is a kind of novel scrambling equipment, and it can be at there being the card conditional access system front-end to produce 2 kinds of different control word CW1 and CW2 respectively with nothing card conditional access system front-end.
It is described that the card conditional access system front-end is arranged is that original CA server that card article spare receiving system is arranged has been installed, described no card conditional access system front-end is the CA server that no card article spare receiving system has been installed, and it all is to meet the condition receiving system that the DVB organization condition receives standard that card article spare receiving system and no card article spare receiving system are wherein arranged.
A kind of method of reseptance of digital television conditional access system of anti-CW diffusion sharing, its step is:
1) program data TS stream enters scrambling equipment through behind the multiplexer;
2) scrambling equipment produces the control word CW1 that the card conditional access system front-end uses respectively and does not have the control word CW2 that the card conditional access system front-end is used;
3) there is the card conditional access system front-end to generate Entitlement Control Message ECM1 and Entitlement Management Message EMM1 according to control word CW1;
Do not have the card conditional access system front-end and generate Entitlement Control Message ECM2 and Entitlement Management Message EMM2 according to control word CW2;
4) scrambling equipment is with step 2) in full detail and the audio, video data signal of reception send into modulator, modulator sends to conditional access terminal by digital TV network;
5) demultiplexing module of conditional access terminal is carried out demultiplexing to the data that receive, and will there be the Entitlement Control Message ECM1 of card conditional access system front-end and Entitlement Management Message EMM1 to send into smart card module, smart card module obtains CW1 according to Entitlement Control Message ECM1 and Entitlement Management Message EMM1, then CW1 is delivered to authentication module, whether authentication module utilizes CW1 Rule of judgment receiving terminal legal;
If conditional access terminal is illegal, then authentication module sends to descrambling module with the conditional access terminal invalid information, and descrambling module will can not worked this moment, not receive the Entitlement Control Message ECM2 and the Entitlement Management Message EMM2 that do not have the card conditional access system front-end;
If conditional access terminal is legal, after then descrambling module is received the conditional access terminal legitimate messages that authentication module sends, receive the Entitlement Control Message ECM2 and the Entitlement Management Message EMM2 that do not have the card conditional access system front-end, descrambling module is by the controlled word CW2 of Entitlement Management Message EMM2 decrypt authorized control information ECM2, utilize CW2 descrambling program data then, and the program data behind the descrambling is sent to playing module play.
Described step 2) in, control word CW1 only is responsible for terminal legality is verified; Control word CW2 is responsible for scrambled data is carried out descrambling.
In the digital television conditional access system of anti-CW diffusion sharing of the present invention, there is card article spare receiving system to follow DVB organization condition receiving system standard, it is that original CA server that card article spare receiving system is arranged has been installed that the card conditional access system front-end is arranged, its structure is not changed, but it only to the verifying of conditional access terminal legitimacy, can't solve scrambled program; No card article spare receiving system is followed DVB organization condition receiving system standard, not having the card conditional access system front-end is the CA server that no card article spare receiving system has been installed, but only use original have card article spare receiving system checking receiving terminal legal after operate as normal, carry out the program descrambling.
Scrambling equipment is also supported card being arranged, not having two kinds of different control words of condition receiving front-ends generation of card except that supporting that DVB organizes the common scrambling standard.The control word to there being the card conditional access system front-end to be produced wherein is mainly used to differentiate the legitimacy of receiving terminal; To there not being the card control word that conditional access system front-end produced, be used for audio and video data streams is carried out scrambling and descrambling.
Conditional access terminal does not use original Conditional Access that has the card conditional access system front-end to finish digital program before carrying out the condition receiving system displacement, carry out using original Conditional Access that has card conditional access system front-end and new no card conditional access system front-end to carry out digital program after the condition receiving system displacement.
The invention has the beneficial effects as follows: can under the situation that does not change the conditional access terminal hardware configuration, replace the existing card article spare receiving system that has, solve the existing defective that card article spare receiving system fail safe aspect is arranged, thoroughly avoid the diffusion sharing of CW.
Description of drawings:
Fig. 1 is to use the digital TV front-end system configuration schematic diagram of the digital television conditional access system of anti-CW diffusion sharing;
Fig. 2 is a novel scrambling equipment work schematic diagram of the present invention;
Fig. 3 is a conditional access terminal structural representation of the present invention.
Wherein, the card conditional access system front-end is arranged 1., 2. do not have the card conditional access system front-end, 3. scrambling equipment, 4. modulator, 5. conditional access terminal, 51. demultiplexing module, 52. smart card modules, 53. authentication modules, 54. descrambling module, 55. playing modules, 6. multiplexer, 7. digital TV network.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Among Fig. 1, it is that original CA server that card article spare receiving system is arranged has been installed that card conditional access system front-end 1 is arranged, and it follows DVB organization condition receiving system standard; Not having card conditional access system front-end 2 is CA servers that no card article spare receiving system has been installed, and no card article spare receiving system is followed DVB organization condition receiving system standard; Scrambling equipment 3 is except that supporting that DVB organizes the common scrambling standard, also support card being arranged, not having two kinds of different control words of conditional access system front-ends generation of card, wherein, to the control word that has card article spare receiving system to be produced, be mainly used to differentiate the legitimacy of receiving terminal, to the control word that no card article spare receiving system is produced, be used for audio and video data streams is carried out scrambling and descrambling; Multiplexer 6 is responsible for that TS is flowed program data and is sent into scrambling equipment 3 after multiplexing; Modulator 4 is responsible for the data after the scrambling are sent in the digital TV network 7; Conditional access terminal 5 can be a digital TV set-top box, it also can be digital TV integrated machine, the ECM1 that has card conditional access system front-end 1 to issue by deciphering obtains CW1, carry out the terminal legality inspection, the ECM2 that issues by deciphering nothing card conditional access system front-end 2 obtains CW2, and scrambled program is carried out descrambling.
Among Fig. 2, scrambling equipment 3 produces control word CW1 and has given card conditional access system front-end 1, there is card conditional access system front-end 1 to utilize control word CW1 to generate to be authorized control information ECM1, have card conditional access system front-end 1 also and Subscriber Management System (SMS) alternately, generate Entitlement Management Message EMM1, and ECM1 and the EMM1 that generates sent to scrambling equipment 3; Scrambling equipment 3 also produces control word CW2 simultaneously and sends to does not have card conditional access system front-end 2, do not have card conditional access system front-end 2 and utilize control word CW2 to generate to be authorized control information ECM2, do not have card conditional access system front-end 2 also and Subscriber Management System (SMS) alternately, generate Entitlement Management Message EMM2, and ECM2 and the EMM2 that generates sent to scrambling equipment 3.Scrambling equipment 3 will receive that ECM1/EMM1 and ECM2/EMM2 send to modulator 4, and then send in the digital TV network 7.
Fig. 3 is a conditional access terminal structural representation of the present invention, conditional access terminal 5 is for having smart card module 52 and using smart card to carry out digital TV set-top box or digital TV integrated machine that condition receives, it comprises demultiplexing module 51, it is connected with descrambling module 54 with smart card module 52 respectively, smart card module 52 and authentication module 53 one-way communications, authentication module 53 and descrambling module 54 one-way communications, 54 of descrambling modules are connected with playing module 55.
The course of work of the present invention is:
1) program data TS stream enters scrambling equipment through behind the multiplexer;
2) scrambling equipment produces the control word CW1 that the card conditional access system front-end uses respectively and does not have the control word CW2 that the card conditional access system front-end is used;
3) there is the card conditional access system front-end to generate Entitlement Control Message ECM1 and Entitlement Management Message EMM1 according to control word CW1;
Do not have the card conditional access system front-end and generate Entitlement Control Message ECM2 and Entitlement Management Message EMM2 according to control word CW2;
4) scrambling equipment is with step 2) in full detail and the audio, video data signal of reception send into modulator, modulator sends to conditional access terminal by digital TV network;
5) demultiplexing module of conditional access terminal is carried out demultiplexing to the data that receive, and will there be the Entitlement Control Message ECM1 of card conditional access system front-end and Entitlement Management Message EMM1 to send into smart card module, smart card module obtains CW1 according to Entitlement Control Message ECM1 and Entitlement Management Message EMM1, then CW1 is sent into authentication module, whether authentication module utilizes CW1 Rule of judgment receiving terminal legal;
If conditional access terminal is illegal, then authentication module sends to descrambling module with the conditional access terminal invalid information, and descrambling module will can not worked this moment, not receive the Entitlement Control Message ECM2 and the Entitlement Management Message EMM2 that do not have the card conditional access system front-end;
If conditional access terminal is legal, after then descrambling module is received the conditional access terminal legitimate messages that authentication module sends, receive the Entitlement Control Message ECM2 and the Entitlement Management Message EMM2 that do not have the card conditional access system front-end, descrambling module is by the controlled word CW2 of Entitlement Management Message EMM2 decrypt authorized control information ECM2, utilize CW2 descrambling program data then, and the program data behind the descrambling is sent to playing module play.
Described step 2) in, control word CW1 only is responsible for terminal legality is verified; Control word CW2 is responsible for scrambled data is carried out descrambling.
Claims (6)
1. the digital television conditional access system of an anti-CW diffusion sharing, it is characterized in that, it includes card conditional access system front-end (1) and does not have card conditional access system front-end (2), card conditional access system front-end (1) is wherein arranged only to the verifying of conditional access terminal legitimacy, do not have card conditional access system front-end (2) and after having card conditional access system front-end (1) checking receiving terminal legal, carry out the control of program descrambling; Both all are connected with scrambling equipment (3), and scrambling equipment (3) is connected with multiplexer (6), and scrambling equipment (3) also is connected with modulator (4) simultaneously, and modulator (4) then is connected with conditional access terminal (5); Described scrambling equipment (3) is at there being card conditional access system front-end (1) to produce 2 kinds of different control word CW1 and CW2 respectively with nothing card conditional access system front-end (2).
2. the digital television conditional access system of anti-CW diffusion sharing as claimed in claim 1, it is characterized in that, described conditional access terminal (5) carries out digital TV set-top box or digital TV integrated machine that condition receives for using smart card, receiving terminal (5) comprises demultiplexing module (51), Multiplexing module (51) is connected with descrambling module (54) with smart card module (52) respectively, smart card module (52) and authentication module (53) one-way communication, authentication module (53) and descrambling module (54) one-way communication, descrambling module (54) then is connected with playing module (55).
3. the digital television conditional access system of anti-CW diffusion sharing as claimed in claim 1 or 2 is characterized in that, described modulator (4) is connected with conditional access terminal (5) by digital TV network (7).
4. the digital television conditional access system of anti-CW diffusion sharing as claimed in claim 1, it is characterized in that, it is described that card conditional access system front-end (1) is arranged is to have installed the CA of card article spare receiving system server is arranged, described no card conditional access system front-end (2) is the CA server that no card article spare receiving system has been installed, and it all is to meet the condition receiving system that the DVB organization condition receives standard that card article spare receiving system and no card article spare receiving system are wherein arranged.
5. method of reseptance that adopts the digital television conditional access system of the described anti-CW diffusion sharing of claim 1 is characterized in that its step is:
1) enters scrambling equipment (3) behind the program data TS stream process multiplexer (6);
2) scrambling equipment (3) produces the control word CW1 that card conditional access system front-end (1) usefulness is arranged respectively and does not have the control word CW2 that blocks conditional access system front-end (2) usefulness;
3) there is card conditional access system front-end (1) to generate Entitlement Control Message ECM1 and Entitlement Management Message EMM1 according to control word CW1;
Do not have card conditional access system front-end (2) and generate Entitlement Control Message ECM2 and Entitlement Management Message EMM2 according to control word CW2;
4) scrambling equipment is with step 2) in full detail and the audio, video data signal of reception send into modulator (4), modulator (4) sends to conditional access terminal (5) by digital TV network (7);
5) demultiplexing module (51) of conditional access terminal (5) is carried out demultiplexing to the data that receive, and will there be the Entitlement Control Message ECM1 of card conditional access system front-end (1) and Entitlement Management Message EMM1 to send into smart card module (52), smart card module (52) obtains CW1 according to Entitlement Control Message ECM1 and Entitlement Management Message EMM1, then CW1 is sent to authentication module (53), whether authentication module (53) is legal according to CW1 Rule of judgment receiving terminal (5);
If conditional access terminal (5) is illegal, then authentication module (53) sends to descrambling module (54) with conditional access terminal (5) invalid information, descrambling module this moment (54) will can not worked, and not receive the Entitlement Control Message ECM2 and the Entitlement Management Message EMM2 that do not have card conditional access system front-end (2);
If conditional access terminal (5) is legal, after then descrambling module (54) is received conditional access terminal (5) legitimate messages that authentication module (53) sends, receive the Entitlement Control Message ECM2 and the Entitlement Management Message EMM2 that do not have card conditional access system front-end (2), descrambling module (54) is by the controlled word CW2 of Entitlement Management Message EMM2 decrypt authorized control information ECM2, utilize CW2 descrambling program data then, and the program data behind the descrambling is sent to playing module (55) play.
6. the method for reseptance of the digital television conditional access system of anti-CW diffusion sharing as claimed in claim 5 is characterized in that, described step 2) in, control word CW1 only is responsible for terminal legality is verified; Control word CW2 is responsible for scrambled data is carried out descrambling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008102497348A CN101442659B (en) | 2008-12-30 | 2008-12-30 | Shared digital television condition receiving system capable of preventing CW diffusion and the method |
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| CN2008102497348A CN101442659B (en) | 2008-12-30 | 2008-12-30 | Shared digital television condition receiving system capable of preventing CW diffusion and the method |
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| CN101442659A CN101442659A (en) | 2009-05-27 |
| CN101442659B true CN101442659B (en) | 2010-06-02 |
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