CN1413025A - Condition receiving method based on digital video-voice frequency flow - Google Patents
Condition receiving method based on digital video-voice frequency flow Download PDFInfo
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- CN1413025A CN1413025A CN 01141665 CN01141665A CN1413025A CN 1413025 A CN1413025 A CN 1413025A CN 01141665 CN01141665 CN 01141665 CN 01141665 A CN01141665 A CN 01141665A CN 1413025 A CN1413025 A CN 1413025A
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Abstract
The present invention relates to a condition receiving method based on digital video-voice frequency flow and is characterized by that in the digital TV receiving equipment a descramble control device of condition receiving system is set, and said descramble control device can be used for controlling TS flow which is scrambled before condition receiving system and according with digital video-voice frequency standard and making reduction. It the condition receiving system said inventino has no need of additional descramble special circuit, and is favorable for encryption and decryptment of various video informations, and other informations of IP packet and electronic business, and can solve the protection of all the form information.
Description
Technical field:
The present invention relates to a kind of condition receiving method, be meant a kind of method of in the digital video-audio receiving equipment, utilizing the descrambling control device to make under the situation of having obtained the authorization to obtain the parameter that the transport stream (TS stream) of scrambling is reduced especially based on digital video-voice frequency flow.
Background technology:
Condition receives (Conditional Access is called for short CA) system and is meant and is used for controlling the system that user (Subscriber) receives broadcast service or program that is: the user can only watch broadcast service or the program through authorizing.Its basic purpose is in TV station's television system the user to be carried out authorization control and empowerment management, thereby realizes the paid service of Radio Data System.
Condition receiving system (Conditional access system is hereinafter to be referred as CAS) can be realized the unified management mandate and the control of the every business of TV station.From technical standpoint, this system is again a comprehensive system, integrated multiple advanced technology, comprise system management, network technology, digital compression coding, scrambling-descrambling technology, encryption and decryption technology, multiplexer technology, modulation-demodulation technique, set-top box technique, smart card techniques etc., also relate to the application technology of database aspects such as user management, program, toll administration simultaneously.
Early stage condition receiving system scrambling to as if anolog TV signals, promptly analog signal is carried out scrambling at front end, make general television set to watch, control the descrambler switch of unique user, have only on user's ability that descrambler has been installed and often watch by the addressing of front end.First generation conditional access system can be realized full frequency band scrambling and channel scrambling, and early stage, implementation method adopted the method for simulation usually, as the video paraphase, horizontal synchronization is overlapping, vertical synchronization is overlapping etc.; Later stage has been done the local digital processing, as numeral method such as video line shake at random.But there are some problems in first generation conditional access system: on the one hand, scrambling can produce loss to signal usually; On the other hand, because the restriction of analog signal, system can only adopt simple relatively method for scrambling, almost all is cracked so far.
Produce along with the appearance of Digital Television, the scrambling object of condition receiving system is changed into digitized video information and control signal corresponding.Since adopt various modern mathematics methods to digital signal add, scramble process, make fail safe be greatly improved.But this mode biases toward the adding of signal, Descrambling Algorithms, and is inconsiderate to the engineering construction method, therefore promote and get up to have big difficulty, and this so far condition receiving system overwhelming majority that adds Descrambling Algorithms that lays particular stress on is cracked.
Since 1998, third generation condition receiving system has appearred, its scrambling is to liking digitized video information, all average informations in corresponding control information and the descrambling process, owing to adopted modern digital method and microelectric technique that relevant information is added scramble process, therefore it is very big to crack difficulty, is not cracked by commercialization yet so far.But third generation condition receiving system need add the descrambling special circuit in receiver, causes conflicting with the DVB standard, is unfavorable for close and how close application.
The appearance of digital technology and computer technology are advanced by leaps and bounds for conditional access system has proposed new challenge and requirement, have given its new content and implication.The condition receiving system of laying particular stress on algorithm respectively has length with the condition receiving system of laying particular stress on special circuit, particularly can only encrypt at video information, can't realize encryption and decryption for information such as the bag of the IP under network and the computer environment, ecommerce; This just needs a kind of new mechanism can solve protection to all form information contents, and this mechanism should be irrelevant with transmission, can have various ways and level, and this is a condition receiving system developing direction of new generation.
Summary of the invention:
Main purpose of the present invention is to provide a kind of condition receiving method based on digital video-voice frequency flow; in the digital video-audio receiving equipment, be provided for descrambling control device to the scrambled program descrambling; make TV station or Virtual network operator adopt the TS stream of conditional access system front-end scrambling under the situation that the user has obtained the authorization, can reduce, thereby normally obtained the service that the user has bought.
Another object of the present invention is to provide a kind of condition receiving method based on digital video-voice frequency flow, it has avoided condition receiving system need add the descrambling special circuit in receiver, can not cause and the conflicting of digital video-voice frequency flow standard, help with close and how close application.
Another purpose of the present invention is to provide a kind of condition receiving method based on digital video-voice frequency flow, and this method can not only be encrypted at video information, also can realize encryption and decryption for information such as the bag of the IP under network and the computer environment, ecommerce; Realization has various ways and level and irrelevant with transmission, can solve the protection to all form information contents.
The objective of the invention is to realize by the following technical solutions:
A kind of condition receiving method based on digital video-voice frequency flow, the condition that is provided with in apparatus of digital television receiving is accepted the descrambling control device of system, and this descrambling control device control is reduced by the transport stream conditional access system front-end scrambling, that meet the digital video-audio standard (TS stream).
Apparatus of digital television receiving is when obtaining the business that Virtual network operator provides, and at first analytically dependent professional special services description list (PSI table) is found out the information on services of specific business, does further processing according to the scrambled state that is reduced object then.
This processing comprises:
Step 1: be the business of scrambling not if the information on services of this specific transactions shows this business, the TS that then apparatus of digital television receiving directly will be relevant with this business flows demultiplexing, directly is sent to the service broadcast device then;
Step 2: if this specific transactions is by the business of scrambling, then the descrambling control device that is provided by this service supplier continues to resolve other relevant PSI tables, therefrom find out the specific bag identifier (Packet identifier is hereinafter to be referred as PID) of the Entitlement Control Message of interference service and the PID of Entitlement Management Message of adding;
Step 3: the key message that apparatus of digital television receiving utilizes these PID set to obtain from the descrambling control device, and further apply for the filtration channel of Deplexing apparatus (DEMUX), the parameter of DEMUX filtration channel is set, the Entitlement Management Message of Entitlement Control Message is filtered;
Step 4: after obtaining corresponding Entitlement Control Message and Entitlement Management Message,, utilize message mechanism to be sent to the descrambling control device and handle by to the data message analyzing and processing;
Step 5: the descrambling control device turns back to apparatus of digital television receiving with result;
Step 6: the result who returns is a control word, the corresponding descrambling keyword of apparatus of digital television receiving continuation application, again this keyword is associated with the corresponding specific data channel that adds interference service, the scrambling sequence that the descrambling control device is returned is set in this descrambling keyword again, and reduction adds interference service accordingly.
When the exchanges data of descrambling control device and apparatus of digital television receiving, also the data that transmitted are encrypted; That is: before descrambling control device return control word, this descrambling control device carries out cryptographic calculation to the control word that the decrypt authorized control information is obtained according to its inner dedicated encrypted algorithm, returns to the control word that apparatus of digital television receiving is encrypted; Apparatus of digital television receiving is decrypted the control word of encrypting according to the cryptographic algorithm and the corresponding decruption key of its inside, obtains the control word of deciphering, carries out the setting of control word then, and reduction adds interference service.
Described descrambling control device is configured on the corresponding interface of apparatus of digital television receiving, and the empowerment management data of authorization control data that apparatus of digital television receiving obtains, that encrypted by front end are delivered in this descrambling control device by general purpose I/O interface and handled.
Described descrambling control device comprises intelligent card interface circuit, intelligent card reading device and special intelligent card at least, and this intelligent card interface circuit is used to connect intelligent card reading device and apparatus of digital television receiving.
Described special intelligent card is the special intelligent card with CPU.
Described PSI table comprises at least: the PID of business control information (Entitlement controlmessage is hereinafter to be referred as ECM), service management information (Entitlement managementmessage is hereinafter to be referred as EMM).
At least comprise the PID of Entitlement Control Message and the PID of the Entitlement Management Message that this TS flows in the described scrambling business information.
The described control word of returning in the program business information is plaintext control word or ciphertext control word.
Apparatus of digital television receiving comprises the steps: the processing of the control word that received
Step 1: if the apparatus of digital television receiving reception is the plaintext control word, then apply for a descrambler slot, after the business association with this descrambler slot and specific scrambling, directly this plaintext control word is set in the descrambler of having applied for;
Step 2: if this control word is the ciphertext control word, then apply for a descrambler slot, with this slot with specific add interference service and be associated after, this ciphertext control word is control word expressly by special-purpose public key algorithm deciphering, this plaintext control word is set in the descrambler of having applied for again.
The present invention is by being provided for the descrambling control device to the scrambled program descrambling in the digital video-audio receiving equipment, make TV station or Virtual network operator adopt the TS stream of conditional access system front-end scrambling under the situation that the user has obtained the authorization, can reduce, thereby normally obtained the service that the user has bought; It has avoided condition receiving system need add the descrambling special circuit in receiver, can not cause and the conflicting of digital video-voice frequency flow standard, and helps with close and how close application; This method can not only also can realize encryption and decryption for information such as the bag of the IP under network and the computer environment, ecommerce at the video information encryption and decryption; Realized having various ways and level and irrelevant, can solve protection all form information contents with transmission.
The present invention is described in further detail below in conjunction with accompanying drawing and specific embodiment:
Description of drawings:
Fig. 1 is the theory structure schematic diagram of one embodiment of the invention.
Embodiment:
Referring to Fig. 1, with the digital TV set-top box is example, and outside TS stream enters Deplexing apparatus (DEMUX) through data channel after entering set-top box, demultiplexing is at first analysed relevant PSI tabulation under the control of digital TV set-top box, obtains the information table of specific transactions.If this business is for adding interference service, digital TV set-top box is finished according to the information of obtaining Entitlement Control Message and Entitlement Management Message is filtered, and this step finishes in DEMUX.
After getting access to Entitlement Control Message and Entitlement Management Message (being encrypted by front end), digital TV set-top box is delivered to these information in the smart card by general purpose I/O interface, finishes processing to these data by this smart card.Smart card to these data decryptions after, handle accordingly again, if the information after handling is control word, smart card just returns to digital TV set-top box to these information, after the controlled word of digital TV set-top box, will apply for a descrambling keyword, and this descrambling keyword is associated with the specific interference service that adds, after the success, control word is set in the descrambling keyword, the corresponding specific interference service that adds will be reduced again.
Digital TV set-top box is when obtaining the business that Virtual network operator provides, and at first analytically dependent PSI table is found out the information on services of specific business.If it is the business of not scrambling that the information on services of this specific transactions shows this business, directly be sent to the service broadcast device behind the TS stream demultiplexing that then digital TV set-top box directly will be relevant with this business.If show that in PSI this specific transactions by a business of scrambling, then at first requires the user to insert the above-mentioned smart card of mentioning in digital TV set-top box; Digital TV set-top box at first read from smart card after the user inserted smart card, the necessary information of condition receiving system, after obtaining these necessary informations, digital TV set-top box is used these necessary informations, continue to resolve other relevant PSI tables, therefrom find out the PID of the specific Entitlement Control Message that adds interference service and the PID of Entitlement Management Message, obtain after the PID of Entitlement Control Message of these Entitlement Management Messages, the key message that digital TV set-top box utilizes these PID set to obtain from smart card, the filtration channel of application DEMUX, the parameter of DEMUX filtration channel is set, the Entitlement Management Message of Entitlement Control Message is filtered.
After filtering out useful Entitlement Control Message and Entitlement Management Message,, be sent to intelligent card in processing by message mechanism again to this data message analyzing and processing.After intelligent card in processing is finished, result is returned digital TV set-top box.If this result is a control word, show the scrambling sequence that obtains specific scrambled program, digital TV set-top box is then applied for corresponding descrambling keyword, again this this keyword is associated with the corresponding specific data channel that adds interference service, the scrambling sequence that smart card is returned is set in this descrambling keyword again, will reduce to add interference service accordingly.
The intelligent card interface control circuit is configured on the intelligent card interface of digital TV set-top box, and the empowerment management data of the authorization control data of being encrypted by front end that make that digital TV set-top box obtains can be delivered in the smart card and handle by general purpose I/O interface.In the present embodiment, smart card partly comprises intelligent card interface circuit, intelligent card reading device and dedicated cpu smart card.
TS flows to after the digital TV set-top box, under the control of central cpu therein, carries out demultiplexing, obtains all business information of this TS stream.For the business of scrambling, comprise the PID of Entitlement Control Message and the PID of the Entitlement Management Message that this TS flows in its business information.Central authorities' Controlled CPU utilizes the PID of the relevant Entitlement Control Message of this business that the Entitlement Control Message in this TS stream is filtered, the Entitlement Control Message that obtains is delivered to smart card under the control of central Controlled CPU, after treating smart card return control word (scrambling sequence), digital TV set-top box is applied for the descrambling keyword under the control of central Controlled CPU, and the descrambling keyword that will apply for is thought association with the business datum passage of scrambling, control word is being set among the descrambling keyword, above-mentioned descrambling step repeats, till this scrambling service finishes.
Because condition is accepted in the general all communications between smart card and digital TV set-top box of the potential safety hazard of system, the hacker generally starts with from this part when cracking; So, data have been carried out once encrypting in the communication of smart card and digital TV set-top box in the present invention, in order to the fail safe of protected data.Concrete way is: before the smart card return control word, the control word that smart card obtains the decrypt authorized control information is carried out cryptographic calculation one time according to the special-purpose RSA Algorithm of its inside; Therefore, return to the control word for encrypting of digital TV set-top box.Digital TV set-top box is used its inner rsa cryptosystem algorithm and corresponding decruption key again, and the control word of encrypting is decrypted, and obtains expressly control word, and then carries out the setting of control word, is added interference service thereby reduce.
Claims (11)
1, a kind of condition receiving method based on digital video-voice frequency flow, it is characterized in that: the condition that is provided with in apparatus of digital television receiving is accepted the descrambling control device of system, and this descrambling control device control is reduced by the TS stream conditional access system front-end scrambling, that meet the digital video-audio standard.
2, the condition receiving method based on digital video-voice frequency flow according to claim 1, it is characterized in that: apparatus of digital television receiving is when obtaining the business that Virtual network operator provides, at first analytically dependent PSI table, find out the information on services of specific business, do further processing according to the scrambled state that is reduced object then.
3, the condition receiving method based on digital video-voice frequency flow according to claim 2 is characterized in that: described further processing comprises:
Step 1: be the business of scrambling not if the information on services of this specific transactions shows this business, the TS that then apparatus of digital television receiving directly will be relevant with this business flows demultiplexing, directly is sent to the service broadcast device then;
Step 2: if this specific transactions by the business of scrambling, then the descrambling control device that is provided by this service supplier continues to resolve other relevant PSI tables, therefrom finds out the PID of the specific Entitlement Control Message that adds interference service and the PID of Entitlement Management Message;
Step 3: the key message that apparatus of digital television receiving utilizes these PID set to obtain from the descrambling control device, and further apply for the filtration channel of DEMUX, the parameter of DEMUX filtration channel is set, the Entitlement Management Message of Entitlement Control Message is filtered;
Step 4: after obtaining corresponding Entitlement Control Message and Entitlement Management Message,, utilize message mechanism to be sent to the descrambling control device and handle by to the data message analyzing and processing;
Step 5: the descrambling control device turns back to apparatus of digital television receiving with result;
Step 6: the result who returns is a control word, the corresponding descrambling keyword of apparatus of digital television receiving continuation application, again this keyword is associated with the corresponding specific data channel that adds interference service, the scrambling sequence that the descrambling control device is returned is set in this descrambling keyword again, and reduction adds interference service accordingly.
4, the condition receiving method based on digital video-voice frequency flow according to claim 3 is characterized in that: when the exchanges data of descrambling control device and apparatus of digital television receiving, also the data that transmitted are encrypted; It comprises:
Before descrambling control device return control word, this descrambling control device carries out cryptographic calculation to the control word that the decrypt authorized control information is obtained according to its inner dedicated encrypted algorithm, returns to the control word that apparatus of digital television receiving is encrypted;
Apparatus of digital television receiving is decrypted the control word of encrypting according to the cryptographic algorithm and the corresponding decruption key of its inside, obtains the control word of deciphering, carries out the setting of control word then, and reduction adds interference service.
5, according to claim 3,4 described condition receiving methods based on digital video-voice frequency flow, it is characterized in that: described descrambling control device is configured on the corresponding interface of apparatus of digital television receiving, and the empowerment management data of authorization control data that apparatus of digital television receiving obtains, that encrypted by front end are delivered in this descrambling control device by general purpose I/O interface and handled.
6, the condition receiving method based on digital video-voice frequency flow according to claim 5 is characterized in that: described descrambling control device comprises intelligent card interface circuit, intelligent card reading device and special intelligent card at least.
7, the condition receiving method based on digital video-voice frequency flow according to claim 6 is characterized in that: described special intelligent card is the special intelligent card with CPU.
8, the condition receiving method based on digital video-voice frequency flow according to claim 2 is characterized in that: described PSI table comprises at least: the PID of ECM, EMM.
9, the condition receiving method based on digital video-voice frequency flow according to claim 3 is characterized in that: comprise the PID of Entitlement Control Message and the PID of the Entitlement Management Message that this TS flows in the scrambling business information at least.
10, the condition receiving method based on digital video-voice frequency flow according to claim 3 is characterized in that: the described control word of returning in the program business information is plaintext control word or ciphertext control word.
11, according to claim 3 or 10 described condition receiving methods based on digital video-voice frequency flow, it is characterized in that: apparatus of digital television receiving comprises the steps: the processing of the control word that received
Step 1: if the apparatus of digital television receiving reception is the plaintext control word, then apply for a descrambler slot, after the business association with this descrambler slot and specific scrambling, directly this plaintext control word is set in the descrambler of having applied for;
Step 2: if this control word is the ciphertext control word, then apply for a descrambler slot, with this slot with specific add interference service and be associated after, this ciphertext control word is control word expressly by special-purpose public key algorithm deciphering, this plaintext control word is set in the descrambler of having applied for again.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01141665 CN1413025A (en) | 2001-10-08 | 2001-10-08 | Condition receiving method based on digital video-voice frequency flow |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 01141665 CN1413025A (en) | 2001-10-08 | 2001-10-08 | Condition receiving method based on digital video-voice frequency flow |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100413332C (en) * | 2003-09-19 | 2008-08-20 | 松下电器产业株式会社 | Digital television receiver module and digital television receiver using the same |
| 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 |
| CN101267639B (en) * | 2008-05-06 | 2011-01-26 | 普天信息技术研究院有限公司 | A storage card |
| CN101034972B (en) * | 2006-02-15 | 2011-04-13 | 耶德托存取公司 | Method and system providing scrambled content |
| CN105446926A (en) * | 2014-09-09 | 2016-03-30 | 纳瑞塔有限责任公司 | USB interface for performing transport I/O |
-
2001
- 2001-10-08 CN CN 01141665 patent/CN1413025A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100413332C (en) * | 2003-09-19 | 2008-08-20 | 松下电器产业株式会社 | Digital television receiver module and digital television receiver using the same |
| CN101034972B (en) * | 2006-02-15 | 2011-04-13 | 耶德托存取公司 | Method and system providing scrambled content |
| 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 |
| CN101267639B (en) * | 2008-05-06 | 2011-01-26 | 普天信息技术研究院有限公司 | A storage card |
| CN105446926A (en) * | 2014-09-09 | 2016-03-30 | 纳瑞塔有限责任公司 | USB interface for performing transport I/O |
| CN105446926B (en) * | 2014-09-09 | 2020-09-22 | 纳瑞塔有限责任公司 | USB interface for performing transport I/O |
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