CN101742236A - 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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- CN101742236A CN101742236A CN200910311992A CN200910311992A CN101742236A CN 101742236 A CN101742236 A CN 101742236A CN 200910311992 A CN200910311992 A CN 200910311992A CN 200910311992 A CN200910311992 A CN 200910311992A CN 101742236 A CN101742236 A CN 101742236A
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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.), relate in particular to a kind of prevention and the shared method of countering smart card.
Background technology
Condition reception (ConditionalAccess is called for short CA) system is meant and is used for controlling the system that the user receives digital television business, be that 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.Condition receiving system is that in the digital television system is basic, also is most important component.
Mainly based on the DVB standard in Europe before more than 10 years, its cardinal principle is present digital television conditional access system: the key of a pair of periodic change is arranged in the digital television signal of encrypting through front end, be called control word, be called for short 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 and behind the CW that receiving terminal obtains deciphering, can utilize network technology to carry out diffusion sharing CW at that time, 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 many bootleggers, brings serious loss to operator.
The receiving terminal of existing employing smart card condition receiving system, decipherment algorithm is just in smart card, decrypting process is that ciphered data is delivered in the smart card, and the CW 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.This technology can intercept CW in a plurality of places, has caused hidden danger on safety.Fig. 1 has indicated the leak point of CW.
First leak point is the communication point between smart card and the receiving terminal.
Second leak point is between CA module and the descrambler.
The 3rd leak point is the communication process between CA module and the internal memory RAM.
Obtain relatively difficulty of CW in second and the 3rd above-mentioned leak point.But, obtain the CW ratio in first leak point and be easier to, use simple instrument just can realize.In case CW is acquired, utilize network technology, CW can be used by many receiving terminals on the network, only uses a sheet smart card just can realize the free rating charge of a lot of platform receiving terminals program.Even worse situation is, is shared even smart card has been known by operator, also has no idea to determine the card number of the smart card that is used to share, can not share breaking through this CW.The CW network is shared will cause serious economy loss to operator.
Summary of the invention
Purpose of the present invention is exactly to obtain CW in order to solve the present communication point between smart card and the receiving terminal that utilizes, and CW is used for network is shared and learning that smart card is used to can't take after CW shares problems such as counterattacking measure, has proposed 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 a kind of prevention and countering smart card are shared, its flow process is:
(1) intelligent card initialization, smart card is communicated by letter with set-top box;
(2) set-top box receiving digital television signal obtains EMM information and ECM information and gives CA module by demodulation multiplexer, and the CA module dyes to ECM information, and the ECM after the dyeing is labeled as ECM1, and gives smart card with ECM1;
(3) ECM1 counter dye of smart card to receiving if failure information is then pointed out in anti-dyeing failure, withdrawed from flow process; If instead dye successfully, then obtain the ECM that reduces, and ECM is decrypted, obtain CW;
(4) the smart card CW that deciphering obtains to ECM again dyes, and the CW after the dyeing is labeled as CW1, and CW1 is given the CA module of set-top box;
(5) CW1 counter dye of CA module to receiving if failure information is then pointed out in anti-dyeing failure, withdrawed from flow process; If instead dye successfully, then obtain the CW that reduces, and give descrambler CW;
(6) descrambler utilizes CW that the audio, video data of scrambling is carried out descrambling, and gives playing module with the data behind the descrambling and play.
In the described step (1), when smart card is communicated by letter with set-top box, smart card can the unique identification smart card smart card information and dyeing CW process in the key rskey2 that uses send to set-top box, simultaneously, the key rskey1 that uses in set-top box information that set-top box can the unique identification set-top box and the dyeing ECM process sends to smart card.
Described key rskey1 is the key that the CA module in the set-top box generates at random; Described key rskey2 is the key that smart card generates at random.
Described key rskey1 and key rskey2 generate at random by smart card or are generated at random by the CA module.
When described key rskey1 and key rskey2 generate at random by smart card, in each intelligent card initialization, all to regenerate.
CA module in the described step (2) dyes to ECM, is meant that the CA module makes up ECM and set-top box information earlier according to the rule of setting, and then utilizes key rskey1 that the information after making up is encrypted, and obtains ECM1.
The smart card of described step (3) dyes to ECM1 is counter, is meant that smart card utilizes key rskey1 that ECM1 is decrypted earlier, and then the data after the deciphering are resolved, and then obtains ECM and set-top box information.
The smart card of described step (4) dyes to CW, be meant that smart card makes up CW and smart card information earlier according to the rule of setting, and then the information after utilizing key rskey2 to combination is encrypted.
The CA module of described step (5) dyes to CW1 is counter, is meant that the CA module utilizes key rskey2 that CW1 is decrypted earlier, and then the data after the deciphering are resolved, and then obtains CW and smart card information.
In the method for the invention, respectively ECM and CW are dyeed and anti-dyeing.Even CW has been revealed by the communication point between smart card and the set-top box like this, because that reveal is CW after the dyeing, does not have the shared client set top box of smart card owing to there is not the key rskey2 that uses in the anti-dyeing course of CW that nothing is carried out normal rating herein; In addition, do not have the rskey1 key that uses in the ECM dyeing course owing to share client set top box, can't carry out normal dyeing to ECM, smart card will be refused to parse CW for sharing the ECM that client set top box sends.Even rskey1 and rskey2 are shared client set top box and forge, owing in the ECM dyeing course ECM is made up with the set-top box information of energy unique identification set-top box, smart card also will be refused to parse CW for the ECM that shared client set top box sends; In addition, owing in the CW dyeing course CW and smart card information that can the unique identification smart card are made up, share client set top box and also can't share under the situation of smart card information not knowing.Therefore, as long as the key rskey2 that uses in the key rskey1 that can guarantee to use in the ECM dyeing course, the CW dyeing course, be inserted with smart card and do in four of the set-top box information of set-top box of share service end and the smart card information and have one to be safe, be not shared client set top box and know, smart card can't be used to share.Even the set-top box information of key rskey1, key rskey2, smart card information and share service terminal top box all is shared client set top box and has known, client set top box can have been shared smart card, because that shared client set top box receives is the CW of process dyeing, CW through dyeing includes smart card information, can know the information of smart card by any shared client set top box, and then can share counter by conditional access system front-end cancellation mandate to the smart card that is used to share.
The invention has the beneficial effects as follows: can effectively prevent to reveal the smart card that CW causes and share, and can simply take counterattacking measure fast learning after smart card is shared because of the communication point between smart card and the receiving terminal, safe.
Description of drawings
Fig. 1 is the CW leakage point schematic diagram that adopts the receiving terminal of smart card condition receiving system;
Fig. 2 is the flow chart of the shared method of a kind of prevention of the present invention and countering smart card.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes a part of the present invention, and illustrated embodiment of the present invention and explanation thereof are used to explain the present invention, and improper qualification of the present invention in pairs inadequately.
Fig. 1 is the CW leakage point schematic diagram that adopts the receiving terminal of smart card condition receiving system, and mainly comprise three leakage points: first leak point is the communication point between smart card and the receiving terminal; Second leak point is between CA module and the descrambler; The 3rd leak point is the communication process between CA module and the internal memory RAM.Obtain relatively difficulty of CW in second and the 3rd above-mentioned leak point.But, obtain the CW ratio in first leak point and be easier to, use simple instrument just can realize.
Fig. 2 is the flow chart of the shared method of a kind of prevention of the present invention and countering smart card, and it comprises:
(1) intelligent card initialization, smart card is communicated by letter with set-top box;
(2) set-top box receiving digital television signal obtains EMM information and ECM information and gives CA module by demodulation multiplexer, and the CA module dyes to ECM information, and the ECM after the dyeing is labeled as ECM1, and gives smart card with ECM1;
(3) ECM1 counter dye of smart card to receiving if failure information is then pointed out in anti-dyeing failure, withdrawed from flow process; If instead dye successfully, then obtain the ECM that reduces, and ECM is decrypted, obtain CW;
(4) the smart card CW that deciphering obtains to ECM again dyes, and the CW after the dyeing is labeled as CW1, and CW1 is given the CA module of set-top box;
(5) CW1 counter dye of CA module to receiving if failure information is then pointed out in anti-dyeing failure, withdrawed from flow process; If instead dye successfully, then obtain the CW that reduces, and give descrambler CW;
(6) descrambler utilizes CW that the audio, video data of scrambling is carried out descrambling, and gives playing module with the data behind the descrambling and play.
Embodiment 1:
In conjunction with the accompanying drawings 2, the flow process of the method that a kind of prevention and countering smart card are shared is:
(1) intelligent card initialization, smart card generates the encryption and decryption that random key rskey2 is used for CW dyeing and anti-dyeing course, smart card with can unique identification the intelligent card numbers and the key rskey2 of one sheet smart card send to set-top box, set-top box sends to smart card again with the intelligent card numbers received and key rskey2 and sends successfully to guarantee data; Simultaneously, CA module in the set-top box generates the encryption and decryption that random key rskey1 is used for ECM dyeing and anti-dyeing course, set-top box sends to smart card with the number of set-top box and the key rskey1 of energy unique identification set-top box, and smart card will receive that number of set-top box and key rskey1 send it back set-top box again and send successfully to guarantee data;
(2) set-top box receiving digital television signal, obtain ECM information by demodulation multiplexer, and give CA module with ECM information, the CA module is with number of set-top box and ECM information permutation and combination in order, data after utilizing key rskey1 to combination are then encrypted, obtain ECM1, and ECM1 is sent to smart card;
(3) smart card receives ECM1, utilizes key rskey1 that ECM1 is decrypted, if the deciphering failure, the prompting mistake also withdraws from flow process; If the ECM1 successful decryption, then whether the number of set-top box that receives in number of set-top box in the data after the judgement deciphering and the intelligent card initialization process mates, if do not match, also prompting is wrong also withdraws from; If the number of set-top box coupling, the then anti-success of dyeing of ECM1, smart card is decrypted the ECM that anti-dyeing obtains, and obtains CW;
(4) smart card makes up the mode that intelligent card numbers and CW arrange in order, and the data after utilizing key rskey2 to combination are then encrypted, and obtain CW1, and CW1 is issued CA module in the set-top box;
(5) the CA module receives CW1, utilizes key rskey2 that CW1 is decrypted, if the deciphering failure, the prompting mistake also withdraws from flow process; If the CW1 successful decryption, then whether the intelligent card numbers that set-top box receives in intelligent card numbers in the data after the judgement deciphering and the intelligent card initialization process mates, if do not match, then prompting mistake also withdraws from flow process; If the intelligent card numbers coupling, the then anti-success of dyeing of CW1, the CA module obtains deciphering the CW that the scrambling audio, video data uses, and gives descrambler with CW;
(6) descrambler receives CW, utilizes CW descrambling audio, video data, and the audio, video data behind the descrambling is sent to playing module, and then play the TV programme of scrambling on TV.
Among the embodiment 1, ECM dyeing, ECM is counter dyes, 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 seen as long as have one to be safe in four of key rskey1, key rskey2, intelligent card numbers and the number of set-top box, smart card just can't be realized sharing.Even key rskey1, key rskey2, intelligent card numbers and number of set-top box have all been revealed, because that the CA module in the set-top box is received is CW1 (CW after the dyeing), CW1 includes intelligent card numbers, can know by any shared set-top box and the card number of the smart card that is used to share to break through easily by conditional access system front-end to the smart card that is used to share.
Embodiment 2:
In conjunction with the accompanying drawings 2, the flow process of the method that a kind of prevention and countering smart card are shared is:
(1) intelligent card initialization, smart card generates random key rskey, rskey is used for the encryption and decryption of CW dyeing and anti-dyeing course and the encryption and decryption in ECM dyeing and the anti-dyeing course, smart card with can unique identification the intelligent card numbers and the key rskey of one sheet smart card send to set-top box, set-top box sends to smart card again with the intelligent card numbers received and key rskey and sends successfully to guarantee data; Simultaneously, CA module in the set-top box does not generate the key of dyeing and anti-dyeing use, set-top box sends to smart card with the number of set-top box and the key rskey of energy unique identification set-top box, and smart card will receive that number of set-top box and key rskey send it back set-top box again and send successfully to guarantee data;
(2) set-top box receiving digital television signal, obtain ECM information by demodulation multiplexer, and give CA module with ECM information, the CA module is with number of set-top box and ECM information permutation and combination in order, data after utilizing key rskey to combination are then encrypted, obtain ECM1, and ECM1 is sent to smart card;
(3) smart card receives ECM1, utilizes key rskey that ECM1 is decrypted, if the deciphering failure, the prompting mistake also withdraws from flow process; If the ECM1 successful decryption, then whether the number of set-top box that receives in number of set-top box in the data after the judgement deciphering and the intelligent card initialization process mates, if do not match, also prompting is wrong also withdraws from; If the number of set-top box coupling, the then anti-success of dyeing of ECM1, smart card is decrypted the ECM that anti-dyeing obtains, and obtains CW;
(4) smart card makes up the mode that intelligent card numbers and CW arrange in order, and the data after utilizing key rskey to combination are then encrypted, and obtain CW1, and CW1 is issued CA module in the set-top box;
(5) the CA module receives CW1, utilizes key rskey that CW1 is decrypted, if the deciphering failure, the prompting mistake also withdraws from flow process; If the CW1 successful decryption, then whether the intelligent card numbers that set-top box receives in intelligent card numbers in the data after the judgement deciphering and the intelligent card initialization process mates, if do not match, then prompting mistake also withdraws from flow process; If the intelligent card numbers coupling, the then anti-success of dyeing of CW1, the CA module obtains deciphering the CW that the scrambling audio, video data uses, and gives descrambler with CW;
(6) descrambler receives CW, utilizes CW descrambling audio, video data, and the audio, video data behind the descrambling is sent to playing module, and then play the TV programme of scrambling on TV.
Among the embodiment 2, ECM dyeing, ECM is counter dyes, must use key rskey, intelligent card numbers and number of set-top box in CW dyeing and the anti-dyeing course of CW, as seen as long as have one to be safe in key rskey, intelligent card numbers and the number of set-top box, smart card just can't be realized sharing.Even key rskey, intelligent card numbers and number of set-top box have all been revealed, because that the CA module in the set-top box is received is CW1 (CW after the dyeing), CW1 includes intelligent card numbers, can know by any shared set-top box and the card number of the smart card that is used to share to break through easily by conditional access system front-end to the smart card that is used to share.
Embodiment 3:
In conjunction with the accompanying drawings 2, the flow process of the method that a kind of prevention and countering smart card are shared is:
(1) intelligent card initialization, smart card does not generate the key of using in dyeing and the anti-dyeing course, smart card sends to set-top box with the intelligent card numbers of energy unique identification one sheet smart card, and set-top box sends to smart card again with the intelligent card numbers of receiving and sends successfully to guarantee data; Simultaneously, CA module in the set-top box generates random key rskey, be used for the encryption and decryption of ECM dyeing and anti-dyeing course and the encryption and decryption in CW dyeing and the anti-dyeing course, set-top box sends to smart card with the number of set-top box and the key rskey of energy unique identification set-top box, and smart card will receive that number of set-top box and key rskey send it back set-top box again and send successfully to guarantee data;
(2) set-top box receiving digital television signal, obtain ECM information by demodulation multiplexer, and give CA module with ECM information, the CA module is with number of set-top box and ECM information permutation and combination in order, data after utilizing key rskey to combination are then encrypted, obtain ECM1, and ECM1 is sent to smart card;
(3) smart card receives ECM1, utilizes key rskey that ECM1 is decrypted, if the deciphering failure, the prompting mistake also withdraws from flow process; If the ECM1 successful decryption, then whether the number of set-top box that receives in number of set-top box in the data after the judgement deciphering and the intelligent card initialization process mates, if do not match, also prompting is wrong also withdraws from; If the number of set-top box coupling, the then anti-success of dyeing of ECM1, smart card is decrypted the ECM that anti-dyeing obtains, and obtains CW;
(4) smart card makes up the mode that intelligent card numbers and CW arrange in order, and the data after utilizing key rskey to combination are then encrypted, and obtain CW1, and CW1 is issued CA module in the set-top box;
(5) the CA module receives CW1, utilizes key rskey that CW1 is decrypted, if the deciphering failure, the prompting mistake also withdraws from flow process; If the CW1 successful decryption, then whether the intelligent card numbers that set-top box receives in intelligent card numbers in the data after the judgement deciphering and the intelligent card initialization process mates, if do not match, then prompting mistake also withdraws from flow process; If the intelligent card numbers coupling, the then anti-success of dyeing of CW1, the CA module obtains deciphering the CW that the scrambling audio, video data uses, and gives descrambler with CW;
(6) descrambler receives CW, utilizes CW descrambling audio, video data, and the audio, video data behind the descrambling is sent to playing module, and then play the TV programme of scrambling on TV.
Among the embodiment 3, ECM dyeing, ECM is counter dyes, must use key rskey, intelligent card numbers and number of set-top box in CW dyeing and the anti-dyeing course of CW, as seen as long as have one to be safe in key rskey, intelligent card numbers and the number of set-top box, smart card just can't be realized sharing.Even key rskey, intelligent card numbers and number of set-top box have all been revealed, because that the CA module in the set-top box is received is CW1 (CW after the dyeing), CW1 includes intelligent card numbers, can know by any shared set-top box and the card number of the smart card that is used to share to break through easily by conditional access system front-end to the smart card that is used to share.
Claims (9)
1. the method shared of prevention and countering smart card is characterized in that its flow process is:
(1) intelligent card initialization, smart card is communicated by letter with set-top box;
(2) set-top box receiving digital television signal obtains EMM information and ECM information and gives CA module by demodulation multiplexer, and the CA module dyes to ECM information, and the ECM after the dyeing is labeled as ECM1, and gives smart card with ECM1;
(3) ECM1 counter dye of smart card to receiving if failure information is then pointed out in anti-dyeing failure, withdrawed from flow process; If instead dye successfully, then obtain the ECM that reduces, and ECM is decrypted, obtain CW;
(4) the smart card CW that deciphering obtains to ECM again dyes, and the CW after the dyeing is labeled as CW1, and CW1 is given the CA module of set-top box;
(5) CW1 counter dye of CA module to receiving if failure information is then pointed out in anti-dyeing failure, withdrawed from flow process; If instead dye successfully, then obtain the CW that reduces, and give descrambler CW;
(6) descrambler utilizes CW that the audio, video data of scrambling is carried out descrambling, and gives playing module with the data behind the descrambling and play.
2. the method that prevention as claimed in claim 1 and countering smart card are shared, it is characterized in that, in the described step (1), when smart card is communicated by letter with set-top box, smart card can the unique identification smart card smart card information and dyeing CW process in the key rskey2 that uses send to set-top box, simultaneously, the key rskey1 that uses in set-top box information that set-top box can the unique identification set-top box and the dyeing ECM process sends to smart card.
3. the method that prevention as claimed in claim 2 and countering smart card are shared is characterized in that described key rskey1 is the key that the CA module in the set-top box generates at random; Described key rskey2 is the key that smart card generates at random.
4. the method that prevention as claimed in claim 2 and countering smart card are shared is characterized in that described key rskey1 and key rskey2 generate at random by smart card or generated at random by the CA module.
5. the method that prevention as claimed in claim 4 and countering smart card are shared is characterized in that, when described key rskey1 and key rskey2 generate at random by smart card, all will regenerate in each intelligent card initialization.
6. the method that prevention as claimed in claim 1 and countering smart card are shared, it is characterized in that, CA module in the described step (2) dyes to ECM, be meant that the CA module makes up ECM and set-top box information earlier according to the rule of setting, and then utilize key rskey1 that the information after making up is encrypted, obtain ECM1.
7. the method that prevention as claimed in claim 1 and countering smart card are shared, it is characterized in that, the smart card of described step (3) dyes to ECM1 is counter, be meant that smart card utilizes key rskey1 that ECM1 is decrypted earlier, and then the data after the deciphering are resolved, and then obtain ECM and set-top box information.
8. the method that prevention as claimed in claim 1 and countering smart card are shared, it is characterized in that, the smart card of described step (4) dyes to CW, be meant that smart card makes up CW and smart card information earlier according to the rule of setting, and then the information after utilizing key rskey2 to combination is encrypted.
9. the method that prevention as claimed in claim 1 and countering smart card are shared, it is characterized in that, the CA module of described step (5) dyes to CW1 is counter, be meant that the CA module utilizes key rskey2 that CW1 is decrypted earlier, and then the data after the deciphering are resolved, and then obtain CW and smart card information.
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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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102143392A (en) * | 2011-05-10 | 2011-08-03 | 北京广电天地信息咨询有限公司 | Control word encryption and decryption methods and control word encryption and decryption systems |
| CN102523503A (en) * | 2011-12-19 | 2012-06-27 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0912052A1 (en) * | 1997-09-25 | 1999-04-28 | CANAL+ Société Anonyme | Method and apparatus for recording of encrypted digital data |
| CN101282456B (en) * | 2008-04-11 | 2010-08-04 | 青岛海信电器股份有限公司 | Method and apparatus for receiving digital television condition |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102143392A (en) * | 2011-05-10 | 2011-08-03 | 北京广电天地信息咨询有限公司 | Control word encryption and decryption methods and control word encryption and decryption systems |
| 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 |
| CN102523503A (en) * | 2011-12-19 | 2012-06-27 | 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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| CN101742236B (en) | 2015-06-10 |
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