CN101742236B - Method for preventing and countering smart card from being shared - Google Patents
Method for preventing and countering smart card from being shared Download PDFInfo
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- CN101742236B CN101742236B CN200910311992.9A CN200910311992A CN101742236B CN 101742236 B CN101742236 B CN 101742236B CN 200910311992 A CN200910311992 A CN 200910311992A CN 101742236 B CN101742236 B CN 101742236B
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Abstract
The invention relates to a method for preventing and countering a smart card from being shared, which comprises the following steps: (1) the smart card is initialized, and communicates with a set top box; (2) the set top box receives a digital television signal to obtain an ECM, and transmits the ECM to a CA module, and the CA module dyes the ECM to obtain an ECM1, and transmits the ECM1 to the smart card; (3) the smart card carries out the counter-dyeing on the ECM1 to obtain the ECM, and decodes the ECM to obtain a CW; (4) the smart card dyes the CW to obtain a CW1, and transmits the CW1 to the CA module; (5) the CA module carries out the counter-dyeing on the CW1 to obtain the CW, and transmits the CW to a descrambler; and (6) the descrambler descrambles scrambled audio and video data by utilizing the CW. The invention can effectively prevent the smart card from CW sharing, and can easily take countermeasures after learning that the smart card is shared.
Description
Technical field
The present invention relates to digital television techniques field (comprising wired, satellite, ground, mobile digital TV and IPTV etc.), particularly relate to a kind of prevention and the shared method of countering smart card.
Background technology
Condition reception (ConditionalAccess is called for short CA) system refers to the system received digital television business for controlling user, namely user can only watch the digital television program (containing audio frequency, video, data etc.) through authorizing, its basic object is that operator carries out authorization control and empowerment management to user in television system, thus realizes the paid service of digital television system.Condition receiving system is that in digital television system is basic, is also most important part.
Current 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 having a pair periodic change in the digital television signal of front end encryption, is called control word, is called for short CW.Condition receiving system is responsible for CW encryption and is transferred to safely in the decipher of digital television receiving terminal, authorizes the authority of the decryptor decryption of some receiving terminal simultaneously.These decryptor decryption had permission go out CW, are then transferred in descrambler, and descrambler utilizes CW to solve audio and video data streams and plays for playing module.At that time formulation this standard in, just consider and how CW delivered to receiving terminal safely, and do not consider receiving terminal obtain decipher CW after network technology can be utilized to carry out diffusion sharing CW, utilized by bootlegger.This is when current web technology is very flourishing, has just become the leak that of this system serious, and has been utilized by many bootleggers, brought serious loss to operator.
The receiving terminal of existing employing Smart card conditional receiving system, decipherment algorithm just within a smart card, decrypting process delivers in smart card by the data of encryption, and the CW after deciphering passes in receiving terminal by smart card, then by the CA module transfer in receiving terminal in descrambler.CA module is independently partly embedded in set-top box software framework as one.This technology can intercept CW in multiple place, and safety causes hidden danger.Fig. 1 has indicated the leak point of CW.
First leak point is the communication point between smart card and receiving terminal.
Second leak point is between CA module and descrambler.
3rd leak point is the communication process between CA module and internal memory RAM.
CW is obtained relatively difficult above-mentioned second and the 3rd leak point.But, obtain CW ratio first leak point and be easier to, use simple instrument just can realize.Once CW is acquired, utilize network technology, CW can be used by the multiple stage receiving terminal on network, only uses a sheet smart card just can realize a lot of platform receiving terminal Free To Air charge program.Even worse situation is, is shared even if operator is aware of smart card, also has no idea to determine the card number of the smart card being used to share, and can not share break through this CW.CW network is shared and will be caused serious economic loss to operator.
Summary of the invention
Object of the present invention is exactly obtain CW to solve the current communication point between smart card and receiving terminal that utilizes, and CW is used for network and shares and learning that smart card is used to cannot take the problems such as counterattacking measure after CW shares, propose a kind of prevention and the shared method of countering smart card.
To achieve these goals, the present invention adopts following technical scheme:
The method that prevention and countering smart card are shared, its flow process is:
(1) intelligent card initialization, smart card and set top box communication;
(2) Set Top Box receiving digital television signal, obtain EMM information and ECM information by demodulation multiplexer and give CA module, CA module dyes to ECM information, and the ECM after dyeing is labeled as ECM1, and gives smart card by ECM1;
(3) smart card dyes to the ECM1 received is counter, and failure of dyeing if counter, then point out failure information, exit flow process; Dye if counter successfully, then obtain the ECM reduced, and ECM is decrypted, obtain CW;
(4) smart card is deciphered to ECM the CW obtained again and is dyeed, and the CW after dyeing is labeled as CW1, and by the CA module of CW1 feeding device top box;
(5) CA module dyes to the CW1 received is counter, and failure of dyeing if counter, then point out failure information, exit flow process; Dye if counter successfully, then obtain the CW reduced, and give descrambler by CW;
(6) descrambler utilizes CW to carry out descrambling to the audio, video data of scrambling, and the data after descrambling is given playing module broadcasting.
In described step (1), when smart card and set top box communication, smart card can send to Set Top Box by the key rskey2 in the smart card information of unique identification smart card and dyeing CW process, meanwhile, Set Top Box can send to smart card by the key rskey1 in the Set Top Box information of unique identification Set Top Box and dyeing ECM process.
Described key rskey1 is the key of the CA module stochastic generation in Set Top Box; Described key rskey2 is the key of smart card stochastic generation.
Described key rskey1 and key rskey2 is by smart card stochastic generation or by CA module stochastic generation.
When described key rskey1 and key rskey2 is by smart card stochastic generation, all to regenerate when each intelligent card initialization.
CA module in described step (2) dyes to ECM, refers to that ECM and Set Top Box information first combine according to the rule of setting by CA module, and then utilizes key rskey1 to be encrypted the information after combination, obtain ECM1.
The smart card of described step (3) dyes to ECM1 is counter, refers to that smart card first utilizes key rskey1 to be decrypted ECM1, and then resolves the data after deciphering, and then obtains ECM and Set Top Box information.
The smart card of described step (4) dyes to CW, refers to that CW and smart card information first combine according to the rule of setting by smart card, and then utilizes key rskey2 to be encrypted the information after combination.
The CA module of described step (5) dyes to CW1 is counter, refers to that CA module first utilizes key rskey2 to be decrypted CW1, and then resolves the data after deciphering, and then obtains CW and smart card information.
In the method for the invention, respectively dyeing and anti-dyeing are carried out to ECM and CW.Even if CW has been revealed by the communication point between smart card and Set Top Box like this, being CW after dyeing due to what reveal herein, thering is no the shared client set top box of smart card owing to not having the key rskey2 used in the anti-dyeing course of CW will without carrying out normal rating; In addition, because shared client set top box does not have the rskey1 key that uses in ECM dyeing course, normal dyeing cannot be carried out to ECM, smart card by refusal for the ECM sharing client set top box and send parses CW.Forge even if rskey1 and rskey2 is shared client set top box, owing to the Set Top Box information of ECM and energy unique identification Set Top Box being combined in ECM dyeing course, the ECM refusing to send for sharing client set top box is also parsed CW by smart card; In addition, due in CW dyeing course by CW with can the smart card information of unique identification smart card combine, share client set top box and also cannot share when not knowing smart card information.Therefore, as long as the key rskey2 that can ensure to use in key rskey1, CW dyeing course used in ECM dyeing course, be inserted with smart card and do in the Set Top Box information of the Set Top Box of share service end and smart card information four and have one to be safe, be not shared client set top box to know, smart card cannot be used to share.Know even if the Set Top Box information of key rskey1, key rskey2, smart card information and share service set top box is all shared client set top box, client set top box can share smart card, due to the CW being through dyeing that shared client set top box receives, smart card information is included through hyperchromatic CW, the information of smart card can be known by any shared client set top box, and then can, by the mandate of conditional access system front-end cancellation to the smart card being used to share, carry out sharing counter.
The invention has the beneficial effects as follows: effectively can prevent because the communication point between smart card and receiving terminal reveals CW that the smart card that causes is shared, and can simply take counterattacking measure fast after smart card is shared learning, fail safe is high.
Accompanying drawing explanation
Fig. 1 is the CW leakage point schematic diagram of the receiving terminal adopting Smart card conditional receiving system;
Fig. 2 is the flow chart of the method that a kind of prevention of the present invention and countering smart card are shared.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described.
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a part of the present invention, and illustrated embodiment of the present invention and explanation thereof are for explaining the present invention, and paired not improper restriction of the present invention.
Fig. 1 is the CW leakage point schematic diagram of the receiving terminal adopting Smart card conditional receiving system, mainly comprises three leakage points: first leak point is the communication point between smart card and receiving terminal; Second leak point is between CA module and descrambler; 3rd leak point is the communication process between CA module and internal memory RAM.CW is obtained relatively difficult above-mentioned second and the 3rd leak point.But, obtain CW ratio first leak point and be easier to, use simple instrument just can realize.
Fig. 2 is the flow chart of the method that a kind of prevention of the present invention and countering smart card are shared, and it comprises:
(1) intelligent card initialization, smart card and set top box communication;
(2) Set Top Box receiving digital television signal, obtain EMM information and ECM information by demodulation multiplexer and give CA module, CA module dyes to ECM information, and the ECM after dyeing is labeled as ECM1, and gives smart card by ECM1;
(3) smart card dyes to the ECM1 received is counter, and failure of dyeing if counter, then point out failure information, exit flow process; Dye if counter successfully, then obtain the ECM reduced, and ECM is decrypted, obtain CW;
(4) smart card is deciphered to ECM the CW obtained again and is dyeed, and the CW after dyeing is labeled as CW1, and by the CA module of CW1 feeding device top box;
(5) CA module dyes to the CW1 received is counter, and failure of dyeing if counter, then point out failure information, exit flow process; Dye if counter successfully, then obtain the CW reduced, and give descrambler by CW;
(6) descrambler utilizes CW to carry out descrambling to the audio, video data of scrambling, and the data after descrambling is given playing module broadcasting.
Embodiment 1:
By reference to the accompanying drawings 2, the flow process of a kind of method that prevention and countering smart card are shared is:
(1) intelligent card initialization, smart card generates random key rskey2 for the encryption and decryption in CW dyeing and anti-dyeing course, the intelligent card numbers of energy unique identification one sheet smart card and key rskey2 are sent to Set Top Box by smart card, and the intelligent card numbers received and key rskey2 send to smart card to guarantee that data send successfully by Set Top Box again; Simultaneously, CA CMOS macro cell random key rskey1 in Set Top Box is used for the encryption and decryption in ECM dyeing and anti-dyeing course, the number of set-top box of energy unique identification Set Top Box and key rskey1 are sent to smart card by Set Top Box, and smart card will receive number of set-top box and key rskey1 sends it back Set Top Box again to guarantee that data send successfully;
(2) Set Top Box receiving digital television signal, ECM information is obtained by demodulation multiplexer, and give CA module by ECM information, CA module is by number of set-top box and ECM information in turn permutation and combination, then key rskey1 is utilized to be encrypted the data after combination, obtain ECM1, and ECM1 is sent to smart card;
(3) smart card receives ECM1, utilizes key rskey1 to be decrypted ECM1, if decipher unsuccessfully, prompting mistake also exits flow process; If ECM1 successful decryption, then judge in number of set-top box in the data after deciphering and intelligent card initialization process, whether the number of set-top box that receives mates, if do not mated, also prompting mistake also exits; If number of set-top box is mated, then ECM1 is counter dyes successfully, and smart card is decrypted the ECM obtained that instead dyes, and obtains CW;
(4) mode that intelligent card numbers and CW arrange in order combines by smart card, then utilizes key rskey2 to be encrypted the data after combination, obtains CW1, and CW1 is issued the CA module in Set Top Box;
(5) CA module receives CW1, utilizes key rskey2 to be decrypted CW1, if decipher unsuccessfully, prompting mistake also exits flow process; If CW1 successful decryption, then judge in intelligent card numbers in the data after deciphering and intelligent card initialization process, whether the intelligent card numbers that receives of Set Top Box mates, if do not mated, then prompting mistake also exits flow process; If intelligent card numbers mates, then CW1 is counter dyes successfully, and CA module obtains the CW deciphering the use of scrambling audio, video data, and gives descrambler by CW;
(6) descrambler receives CW, utilizes CW descrambling audio, video data, and the audio, video data after descrambling is sent to playing module, and then play the TV programme of scrambling on TV.
In embodiment 1, ECM dyeing, ECM instead dye, must use key rskey1, key rskey2, intelligent card numbers and number of set-top box in CW dyeing and the anti-dyeing course of CW, as long as have one to be safe in visible key rskey1, key rskey2, intelligent card numbers and number of set-top box four, smart card just cannot realize sharing.Even if key rskey1, key rskey2, intelligent card numbers and number of set-top box have all been revealed, that receive due to the CA module in Set Top Box is CW1 (CW after dyeing), CW1 includes intelligent card numbers, the card number for the smart card shared can being known by any shared Set Top Box, can be broken through the smart card for sharing by conditional access system front-end easily.
Embodiment 2:
By reference to the accompanying drawings 2, the flow process of a kind of method that prevention and countering smart card are shared is:
(1) intelligent card initialization, smart card generates random key rskey, rskey is for the encryption and decryption in the encryption and decryption in CW dyeing and anti-dyeing course and ECM dyeing and anti-dyeing course, the intelligent card numbers of energy unique identification one sheet smart card and key rskey are sent to Set Top Box by smart card, and the intelligent card numbers received and key rskey send to smart card to guarantee that data send successfully by Set Top Box again; Simultaneously, CA module in Set Top Box does not generate the key of dyeing and anti-dyeing use, the number of set-top box of energy unique identification Set Top Box and key rskey are sent to smart card by Set Top Box, and smart card will receive number of set-top box and key rskey sends it back Set Top Box again to guarantee that data send successfully;
(2) Set Top Box receiving digital television signal, ECM information is obtained by demodulation multiplexer, and give CA module by ECM information, CA module is by number of set-top box and ECM information in turn permutation and combination, then key rskey is utilized to be encrypted the data after combination, obtain ECM1, and ECM1 is sent to smart card;
(3) smart card receives ECM1, utilizes key rskey to be decrypted ECM1, if decipher unsuccessfully, prompting mistake also exits flow process; If ECM1 successful decryption, then judge in number of set-top box in the data after deciphering and intelligent card initialization process, whether the number of set-top box that receives mates, if do not mated, also prompting mistake also exits; If number of set-top box is mated, then ECM1 is counter dyes successfully, and smart card is decrypted the ECM obtained that instead dyes, and obtains CW;
(4) mode that intelligent card numbers and CW arrange in order combines by smart card, then utilizes key rskey to be encrypted the data after combination, obtains CW1, and CW1 is issued the CA module in Set Top Box;
(5) CA module receives CW1, utilizes key rskey to be decrypted CW1, if decipher unsuccessfully, prompting mistake also exits flow process; If CW1 successful decryption, then judge in intelligent card numbers in the data after deciphering and intelligent card initialization process, whether the intelligent card numbers that receives of Set Top Box mates, if do not mated, then prompting mistake also exits flow process; If intelligent card numbers mates, then CW1 is counter dyes successfully, and CA module obtains the CW deciphering the use of scrambling audio, video data, and gives descrambler by CW;
(6) descrambler receives CW, utilizes CW descrambling audio, video data, and the audio, video data after descrambling is sent to playing module, and then play the TV programme of scrambling on TV.
In embodiment 2, ECM dyeing, ECM instead dye, must use key rskey, intelligent card numbers and number of set-top box in CW dyeing and the anti-dyeing course of CW, as long as have one to be safe in visible key rskey, intelligent card numbers and number of set-top box, smart card just cannot realize sharing.Even if key rskey, intelligent card numbers and number of set-top box have all been revealed, that receive due to the CA module in Set Top Box is CW1 (CW after dyeing), CW1 includes intelligent card numbers, the card number for the smart card shared can being known by any shared Set Top Box, can be broken through the smart card for sharing by conditional access system front-end easily.
Embodiment 3:
By reference to the accompanying drawings 2, the flow process of a kind of method that prevention and countering smart card are shared is:
(1) intelligent card initialization, smart card does not generate the key in dyeing and anti-dyeing course, the intelligent card numbers of energy unique identification one sheet smart card is sent to Set Top Box by smart card, and the intelligent card numbers received sends to smart card to guarantee that data send successfully by Set Top Box again; Simultaneously, CA CMOS macro cell random key rskey in Set Top Box, for the encryption and decryption in the encryption and decryption in ECM dyeing and anti-dyeing course and CW dyeing and anti-dyeing course, the number of set-top box of energy unique identification Set Top Box and key rskey are sent to smart card by Set Top Box, and smart card will receive number of set-top box and key rskey sends it back Set Top Box again to guarantee that data send successfully;
(2) Set Top Box receiving digital television signal, ECM information is obtained by demodulation multiplexer, and give CA module by ECM information, CA module is by number of set-top box and ECM information in turn permutation and combination, then key rskey is utilized to be encrypted the data after combination, obtain ECM1, and ECM1 is sent to smart card;
(3) smart card receives ECM1, utilizes key rskey to be decrypted ECM1, if decipher unsuccessfully, prompting mistake also exits flow process; If ECM1 successful decryption, then judge in number of set-top box in the data after deciphering and intelligent card initialization process, whether the number of set-top box that receives mates, if do not mated, also prompting mistake also exits; If number of set-top box is mated, then ECM1 is counter dyes successfully, and smart card is decrypted the ECM obtained that instead dyes, and obtains CW;
(4) mode that intelligent card numbers and CW arrange in order combines by smart card, then utilizes key rskey to be encrypted the data after combination, obtains CW1, and CW1 is issued the CA module in Set Top Box;
(5) CA module receives CW1, utilizes key rskey to be decrypted CW1, if decipher unsuccessfully, prompting mistake also exits flow process; If CW1 successful decryption, then judge in intelligent card numbers in the data after deciphering and intelligent card initialization process, whether the intelligent card numbers that receives of Set Top Box mates, if do not mated, then prompting mistake also exits flow process; If intelligent card numbers mates, then CW1 is counter dyes successfully, and CA module obtains the CW deciphering the use of scrambling audio, video data, and gives descrambler by CW;
(6) descrambler receives CW, utilizes CW descrambling audio, video data, and the audio, video data after descrambling is sent to playing module, and then play the TV programme of scrambling on TV.
In embodiment 3, ECM dyeing, ECM instead dye, must use key rskey, intelligent card numbers and number of set-top box in CW dyeing and the anti-dyeing course of CW, as long as have one to be safe in visible key rskey, intelligent card numbers and number of set-top box, smart card just cannot realize sharing.Even if key rskey, intelligent card numbers and number of set-top box have all been revealed, that receive due to the CA module in Set Top Box is CW1 (CW after dyeing), CW1 includes intelligent card numbers, the card number for the smart card shared can being known by any shared Set Top Box, can be broken through the smart card for sharing by conditional access system front-end easily.
Claims (5)
1. prevention and the shared method of countering smart card, it is characterized in that, its flow process is:
(1) intelligent card initialization, smart card and set top box communication;
(2) Set Top Box receiving digital television signal, obtain EMM information and ECM information by demodulation multiplexer and give CA module, CA module dyes to ECM information, and the ECM after dyeing is labeled as ECM1, and gives smart card by ECM1; Described CA module dyes to ECM information, refers to that ECM and Set Top Box information first combine according to the rule of setting by CA module, and then utilizes key rskey1 to be encrypted the information after combination, obtain ECM1;
(3) smart card dyes to the ECM1 received is counter, and failure of dyeing if counter, then point out failure information, exit flow process; Dye if counter successfully, then obtain the ECM reduced, and ECM is decrypted, obtain CW; Described smart card dyes to the ECM1 received is counter, refers to that smart card first utilizes key rskey1 to be decrypted ECM1, and then resolves the data after deciphering, and then obtains ECM and Set Top Box information;
(4) smart card is deciphered to ECM the CW obtained again and is dyeed, and the CW after dyeing is labeled as CW1, and by the CA module of CW1 feeding device top box; Described smart card is deciphered to ECM the CW obtained again and is dyeed, and refers to that CW and smart card information first combine according to the rule of setting by smart card, and then utilizes key rskey2 to be encrypted the information after combination;
(5) CA module dyes to the CW1 received is counter, and failure of dyeing if counter, then point out failure information, exit flow process; Dye if counter successfully, then obtain the CW reduced, and give descrambler by CW; Described CA module dyes to the CW1 received is counter, refers to that CA module first utilizes key rskey2 to be decrypted CW1, and then resolves the data after deciphering, and then obtains CW and smart card information;
(6) descrambler utilizes CW to carry out descrambling to the audio, video data of scrambling, and the data after descrambling is given playing module broadcasting.
2. prevention as claimed in claim 1 and the shared method of countering smart card, it is characterized in that, in described step (1), when smart card and set top box communication, smart card can send to Set Top Box by the key rskey2 in the smart card information of unique identification smart card and dyeing CW process, meanwhile, Set Top Box can send to smart card by the key rskey1 in the Set Top Box information of unique identification Set Top Box and dyeing ECM process.
3. prevention as claimed in claim 2 and the shared method of countering smart card, it is characterized in that, described key rskey1 is the key of the CA module stochastic generation in Set Top Box: described key rskey2 is the key of smart card stochastic generation.
4. prevention as claimed in claim 2 and the shared method of countering smart card, it is characterized in that, described key rskey1 and key rskey2 is by smart card stochastic generation or by CA module stochastic generation.
5. prevention as claimed in claim 4 and the shared method of countering smart card, is characterized in that, when described key rskey1 and key rskey2 is by smart card stochastic generation, all will regenerate when each intelligent card initialization.
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| CN200910311992.9A CN101742236B (en) | 2009-12-22 | 2009-12-22 | Method for preventing and countering smart card from being shared |
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| CN200910311992.9A CN101742236B (en) | 2009-12-22 | 2009-12-22 | Method for preventing and countering smart card from being shared |
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| CN102143392B (en) * | 2011-05-10 | 2012-11-14 | 北京广电天地科技有限公司 | Control word encryption and decryption methods and control word encryption and decryption systems |
| CN102523503B (en) * | 2011-12-19 | 2014-08-20 | 华为技术有限公司 | Video-on-demand control method and relative device and system |
| CN107734389A (en) * | 2017-10-31 | 2018-02-23 | 成都德芯数字科技股份有限公司 | Information processing method and digital reception device |
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| CN1279861A (en) * | 1997-09-25 | 2001-01-10 | 卡纳尔股份有限公司 | Method and apparatus for recording of encrypted digital data |
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Address after: Xinluo Avenue high tech Zone of Ji'nan City, Shandong province 250101 silver bearing No. 2008 building 1-501-1 Applicant after: Shandong Taixin Electronics Co., Ltd. Address before: Lixia District, Shandong city of Ji'nan Province Cultural Road 250012 No. 13 Haichen building 6 floor Applicant before: Shandong Taixin Electronics Co., Ltd. |
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