CN102263995A - Simulcrypt-technology-based conditional access method and system - Google Patents
Simulcrypt-technology-based conditional access method and system Download PDFInfo
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- CN102263995A CN102263995A CN2011102416732A CN201110241673A CN102263995A CN 102263995 A CN102263995 A CN 102263995A CN 2011102416732 A CN2011102416732 A CN 2011102416732A CN 201110241673 A CN201110241673 A CN 201110241673A CN 102263995 A CN102263995 A CN 102263995A
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Abstract
The embodiment of the invention discloses a simulcrypt-technology-based conditional access method and a simulcrypt-technology-based conditional access system. The method comprises that: the first front-end equipment of a first-level platform scrambles and encrypts the audio and video data of the first-level platform, multiplexes the data to generate first-level television program data and transmits the first-level television program data to the second front-end equipment of a second-level platform; the second front-end equipment scrambles and encrypts the first-level television program data and the audio and video data of the second-level platform, multiplexes the data to generate second-level television program data and transmits the second-level television program data to a digital television terminal; and the digital television terminal receives the second-level television program data from the second front-end equipment, descrambles and decrypts the second-level television program data and outputs the descrambled television program data for a user to watch. The embodiment of the invention achieves compatibility and interoperability with other conditional access systems, and also realizes common supervision from programs of different levels.
Description
Technical field
The present invention relates to the digital television techniques field, relate in particular to a kind of based on condition receiving method under the secret skill art and system.
Background technology
(Conditional Access System is meant is used for controlling the system that subscriber (Subscriber) receives broadcast service or program CAS) that promptly the subscriber can only watch broadcast service or the program through authorizing to digital television conditional access system.It is the key that realizes personalized service.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.
Existing digital television conditional access system, its structure comprise authentication module, condition receiving front-end module, receiver module.Wherein: authentication module and the two-way communication of receiving terminal module, it is authenticated, generate ID number and authentication information of unique receiving terminal, and the relevant information of receiving terminal is registered to the authenticated user database; Condition receiving front-end module and authenticated user database carry out both-way communication, it transfers the encryption that information in the authenticated user database is finished Entitlement Management Message, and being issued to the receiving terminal module by corresponding addressing system, the condition receiving front-end module also comprises corresponding Entitlement Control Message maker; The safety condition that the receiving terminal module utilizes ID number of producing in the verification process, authentication information and the software of self to finish scrambled program receives.
A complete condition receiving system is made of Subscriber Management System, program information management system, encryption/deciphering system, scrambling/descrambling system etc., and its key component is deciphering and interference blanking system.Fig. 1 shows digital television conditional access system structure chart of the prior art: needed that before audio, video data is sending to digital TV terminal these data are carried out scrambling and handle.Will be during scrambling with reference to a scrambler sequence, this is controlled by initial control word CW by the pseudo-random binary sequence that scrambler produces, and CW is produced by control word generator.CW is decoding key (Coding Word), knows that CW also just can obtain scrambler sequence and can parse TV signal by certain algorithm.Control word CW transmission and control become the core that condition receives.As the system safety core, CW itself need to encrypt and to protect, its business cipher key (Service Key) SK that is otherwise known as, and SK is generated by the program module.In controller encrypting module ECMG (Entitlement Control Message Generator), the authorization key SK that control word CW is encrypted can packaged joining in the authorization control signal (ECM) go, and it is multiplexed into to transmit by meeting spreads to the user.Though CW is encrypted by SK, also is not perfectly safe, and also will carry out encipherment protection again to SK.An ordered series of numbers that utilizes the terminal address sign indicating number to be associated is encrypted, and profit is distributing key DK (Distribute Key), and distributing key is cured in the smart card mostly.Address code writes smart card when operator's hair fastener, it has uniqueness, and different smart cards has different address codes, so can not duplicate card.Distributing key DK encrypts authorization key SK by authorization key encrypting module EMMG (Entitled Manage Message Generator) and forms Entitlement Management Message EMM, this information, also can be multiplexed to transmit and flow to and pass to each user, the EMM bag also comprises out of Memory such as address, subscriber authorisation.Thereby receiving equipment just digital TV terminal just can decomposite DK, SK and CW and obtains scrambler sequence and solve scrambled signals receiving EMM, ECM bag.
This system does not adopt with the secret skill art, can not realize compatible shared with other CA systems.And present condition receiving system all is at local other condition receiving handling method of level, and can't realize the receive mode under the multi-stage platform, and promptly this condition receiving system is not supported multistage conditional access mode, and is inapplicable to the multiple management digital television system.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, the invention provides a kind of based on condition receiving method under the secret skill art and system, by implementing the compatibility that the embodiment of the invention realizes multistage CA system.
In order to address the above problem, the present invention proposes a kind ofly based on the condition receiving method under the secret skill art, described method comprises:
After first headend equipment of first order platform carries out scrambling and encryption to the video/audio of first order platform, data are carried out multiplexing process generate first order television programme data, and be sent to second headend equipment of second level platform;
After second headend equipment carries out scrambling and encryption to the video/audio of first order television programme data and second level platform, data are carried out multiplexing process generate second level television programme data, and be sent to digital TV terminal;
Digital TV terminal receives the second level television programme data that second headend equipment sends, and second level television programme data is carried out descrambling and data decryption, and the television programme data behind the output descrambling is watched for the user.
After first headend equipment of described first order platform carries out scrambling and encryption to the video/audio of first order platform, data is carried out multiplexing process generate first order television programme data, and second headend equipment that is sent to second level platform comprises:
First headend equipment of first order platform carries out scrambling to the audio, video data at first order platform place, utilize the business cipher key of described first order platform to generate the first authorization control signal, utilize user's distributing key of described first order platform to generate first Entitlement Management Message, generate first order television programme data by data being carried out multiplexing process.
After described second headend equipment carries out scrambling and encryption to the video/audio of first order television programme data and second level platform, data are carried out multiplexing process generate second level television programme data, and be sent to digital TV terminal and comprise:
Second headend equipment carries out scrambling to first order television programme data as a common program stream to be handled, utilize the business cipher key of described second level platform to generate the second authorization control signal, utilize user's distributing key of described second level platform to generate second Entitlement Management Message, generate second level television programme data by data being carried out multiplexing process.
Described user's distributing key of utilizing described second level platform generates in second Entitlement Management Message and also comprises:
Extract first Entitlement Management Message in the first order television programme data, and collect first Entitlement Management Message and second Entitlement Management Message;
Entitlement Management Message presentation manager by second level platform produces one by first Entitlement Management Message of first order platform and the mixing Entitlement Management Message of second Entitlement Management Message;
The EMMG-MUX agreement of described mixing Entitlement Management Message by digital video broadcasting DVB standard is inserted in first order television programme data and the second level television programme data.
Described digital TV terminal receives the second level television programme data that second headend equipment sends, and second level television programme data carried out descrambling and data decryption, and the television programme data behind the output descrambling is watched and being comprised for the user: digital TV terminal at first decrypts the video/audio and the first authorization control signal of second level platform, utilizes the first authorization control decrypted signal to go out the video/audio of first order platform afterwards.
Accordingly, it is a kind of based on the condition receiving system under the secret skill art that the embodiment of the invention also provides, and comprising:
First headend equipment of first order platform after being used for video/audio to first order platform and carrying out scrambling and encryption, carries out multiplexing process to data and generates first order television programme data, and be sent to second headend equipment of second level platform;
Second headend equipment of second level platform after being used for video/audio to first order television programme data and second level platform and carrying out scrambling and encryption, carries out multiplexing process to data and generates second level television programme data, and be sent to digital TV terminal;
Digital TV terminal is used to receive the second level television programme data that second headend equipment sends, and second level television programme data is carried out descrambling and data decryption, and the television programme data behind the output descrambling is watched for the user.
First headend equipment of described first order platform is used for the audio, video data at first order platform place is carried out scrambling, utilize the business cipher key of described first order platform to generate the first authorization control signal, utilize user's distributing key of described first order platform to generate first Entitlement Management Message, generate first order television programme data by data being carried out multiplexing process.
Described second headend equipment carries out scrambling to first order television programme data as a common program stream to be handled, utilize the business cipher key of described second level platform to generate the second authorization control signal, utilize user's distributing key of described second level platform to generate second Entitlement Management Message, generate second level television programme data by data being carried out multiplexing process.
Described second headend equipment also is used for extracting first Entitlement Management Message of first order television programme data, and collects first Entitlement Management Message and second Entitlement Management Message; Entitlement Management Message presentation manager by second level platform produces one by first Entitlement Management Message of first order platform and the mixing Entitlement Management Message of second Entitlement Management Message; The EMMG-MUX agreement of described mixing Entitlement Management Message by the DVB standard is inserted in first order television programme data and the second level television programme data.
Described digital TV terminal at first decrypts the video/audio and the first authorization control signal of second level platform, utilizes the first authorization control decrypted signal to go out the video/audio of first order platform afterwards.
In embodiments of the present invention,, follow the DVB standard, realize using mutually with the compatible of other CA systems by adopting with the secret skill art; Adopt the system design of two-stage condition, realize common supervision from the different stage program; ECM and CW based on two CAS platforms in the two-stage CA scheme of scrambling ECM are separate, are independent of each other, and do not need the ECM bag is carried out too much change, only need to extract scrambling ECM bag in terminal in scrambled content, so implement easier.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a digital television conditional access system structure chart of the prior art;
Fig. 2 is the transmission means structural representation of the same secret skill art in the embodiment of the invention;
Fig. 3 is that the two-stage condition in the embodiment of the invention receives related licensing process schematic diagram;
Fig. 4 is the extraction of the Entitlement Management Message EMM in the embodiment of the invention and merges flow chart;
Fig. 5 be in the embodiment of the invention based on the two poles of the earth condition receiving system structure chart under the secret skill art.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
In the embodiment of the invention based on the condition receiving method under the secret skill art, mainly comprise: after first headend equipment of first order platform carries out scrambling and encryption to the video/audio of first order platform, data are carried out multiplexing process generate first order television programme data, and be sent to second headend equipment of second level platform; After second headend equipment carries out scrambling and encryption to the video/audio of first order television programme data and second level platform, data are carried out multiplexing process generate second level television programme data, and be sent to digital TV terminal; Digital TV terminal receives the second level television programme data that second headend equipment sends, and second level television programme data is carried out descrambling and data decryption, and the television programme data behind the output descrambling is watched for the user.
Concrete, first headend equipment of first order platform carries out scrambling to the audio, video data at first order platform place, utilize the business cipher key of described first order platform to generate the first authorization control signal, utilize user's distributing key of described first order platform to generate first Entitlement Management Message, generate first order television programme data by data being carried out multiplexing process.Second headend equipment carries out scrambling to first order television programme data as a common program stream to be handled, utilize the business cipher key of described second level platform to generate the second authorization control signal, utilize user's distributing key of described second level platform to generate second Entitlement Management Message, generate second level television programme data by data being carried out multiplexing process.Second headend equipment also extracts first Entitlement Management Message in the first order television programme data, and collects first Entitlement Management Message and second Entitlement Management Message; Entitlement Management Message presentation manager by second level platform produces one by first Entitlement Management Message of first order platform and the mixing Entitlement Management Message of second Entitlement Management Message; The EMMG-MUX agreement of described mixing Entitlement Management Message by digital video broadcasting DVB standard is inserted in first order television programme data and the second level television programme data.The digital TV terminal here at first decrypts the video/audio and the first authorization control signal of second level platform, utilizes the first authorization control decrypted signal to go out the video/audio of first order platform afterwards.
In order to realize compatible different condition receiving systems, condition receiving system of the present invention is to have adopted with the secret skill art.Be meant by using with a kind of scrambling algorithm and identical control word the technology that a plurality of different CA systems are worked together with the secret skill art.DVB is for to have stipulated general scrambling algorithm with close pattern, and all realize can developing different separately ECM and the EMM that encrypt with close CA system manufacturer, but all will follow the common scrambling algorithm.Under with close situation, with identical control word control scrambling algorithm, and the The whole control word can be by different CA systems through being transferred to the user terminal of different CA systems after encrypting.With the transmission means of secret skill art as shown in Figure 2.At transmitting terminal, condition receiver 1 and condition receiver 2 receive control and treatment to all programs that enter multiplexer condition of carrying out simultaneously, and the compound back one of the ECM1 that is produced, EMM1 and ECM2, EMM2 signal data stream and program data stream leads to and sends the user to.At receiving terminal, because the subsystem of condition receiving system 1 is housed among the receiver A, it can be decoded to ECM1 and EMM1 signal that condition receiver 1 produces, receive the program of system authorization, if receiver A has obtained all by the mandate of scrambled program, then it only with the subsystem that condition receiving system 1 is housed, just can watch the program that all transmit from transmitting terminal.In like manner, receiver B also is like this.
CA of the present invention system still is a kind of conditional receiving system in two stages.So-called two-stage condition receives and is meant, the transmission of central nodule head platform program encryption, local service platform is non-decrypting and pass to the user under direct, central nodule head platform and local service platform managed together local network user's authorization message, the subscriber just can watch shared program after having only the dual-license that has obtained central nodule head platform and local operator.Such design has guaranteed the supervision property and the standardization of programme content.
The basic principle that the two-stage condition receives is: the central nodule head platform is that the scrambled program of first order platform is the front end descrambling not of second level platform at local service platform; the ECM information that local service platform front end produces central program platform is sent to digital TV terminal by local wired network with program after carrying out the scrambling protection.Have only the program authorization message that receives local service platform transmission as the user, the central nodule head platform ECM information reverting of scrambling could be become normal ECM information; Have only the program mandate that receives the transmission of central nodule head platform as the user, could decipher normal central nodule head platform ECM information and obtain CW; The scrambled program of descrambling central nodule head platform.
It is as follows that the two-stage condition receives related licensing process: after the CA of the CA of central program platform and service management system SMS (Service Management System) and local service platform and SMS had defined the product IDs of central nodule head platform scrambled program, local service platform just can be authorized the scrambled program of central program platform.The various places user orders the scrambled program of central nodule head platform, need central nodule head platform and local network company that this user's smart card is authorized, this process is initiated application by the SMS of local service platform, the SMS of central nodule head platform and CA according to predetermined format from dynamic response.Initiate two applications by local SMS, one enters local CA, finishes for the first time and authorizes, and another enters central SMS by the interface between the both sides SMS, and central SMS finishes for the second time by central CA and authorizes.Detailed process as shown in Figure 3.
The mandate of above-mentioned two-stage condition relates to two key technologies: the extraction and the merging of Entitlement Management Message (EMM), the double-encryption of Entitlement Control Message (ECM).To describe in detail successively below.
The extraction of Entitlement Management Message EMM and merging.Owing to can only discern an EMM information at digital TV terminal, therefore need the EMM that two-stage CA produces be merged.At local service platform front end, the extraction of the EMM of central nodule head platform and merging are mainly finished by EMM extractor and EMM gatherer.Can be referring to Fig. 4, detailed process is as follows:
The Step1:EMM extractor is extracted the local user EMM information that is sent by the central nodule head platform out from the transport stream of input, change Step2;
The Step2:EMM gatherer is collected the EMM that is extracted out by the EMM extractor, and it is transmitted to EMM presentation manager in the local operator condition receiving system, changes Step3;
Step3: produce a EMM and mix the EMM data flow of forming, commentaries on classics Step4 by the EMM of local operator and central operator;
Step4: the EMMG-MUX agreement of blended data stream by the DVB standard is inserted in the transport stream of local transport stream and central nodule head platform.EMMG-MUX (Entitled Manage Message Generator Multiplexer, the EMMG multiplex protocol) is how multiplexing a kind of protocol definition EMMG information is, defined the definition of processes such as the connection foundation that comprises channel, stream used message and channel, stream, communication.
The benefit that EMM information is merged is to guarantee that no matter user's digital TV terminal is to watch local program or watching central program that user's smart card can receive the EMM information from two-stage operator.So just guaranteed that two-stage operator sends to this user's significant data, all can not go out the active phenomenon such as key, mandate and bulletin etc.
The double-encryption of Entitlement Control Message ECM.Double-encryption to ECM information is a key technology of guaranteeing two-stage authorizing secure, true(-)running.For condition receiving system based on key, according to the general process of encryption and decryption, there are two kinds of schemes, the one, the multilayer key mechanism according to the CA system carries out multi-enciphering to CW; The 2nd, the ECM bag that central program is transmitted carries out scrambling as program stream, is equivalent to produce CW twice.Choosing second kind of scheme below is described in detail.
Two-stage CA scheme based on scrambling ECM.A common program stream carried out scrambling with local CW when the ECM that the local service platform transmits the central nodule head platform regarded as, produced two parts of ECM like this, i.e. two parts of CW.
Shown in Fig. 5 (sequence number has marked flow sequence among the figure), be described in detail:
Step1: when the program of central platform needed scrambling, its front end produced a CW (a) program is carried out scrambling, and CW (a) becomes ECM (a) with the encryption of higher level's business cipher key and passes to the local service platform, changes Step2;
Step2: the local service platform receives that ECM (a) sends into the local digital television headend with it as a common program stream afterwards and carries out scrambling, produce local CW (b), use the local service key to encrypt to become local ECM (b) bag and deliver to terminal, change Step3;
Step:3: the terminal intelligent card receives local ECM (b) earlier, obtains local CW (b) after the deciphering, changes Step4;
Step4: restore higher level ECM (a) after will going up the descrambling module that level scrambling ECM (a) and local CW (b) send into Digital Television then, again higher level ECM (a) is sent into smart card, obtain higher level CW (a) after the deciphering, change Step5;
Step5: again higher level CW (a) and real scrambled program being sent into the digital TV terminal descrambling module can decode out with program.
Advantage of the present invention: 1), follow the DVB standard, realize using mutually with the compatible of other CA systems by adopting with the secret skill art; Adopt the system design of two-stage condition, realize common supervision from the different stage program; 2) separate based on the ECM and the CW of two CAS platforms in the two-stage CA scheme of scrambling ECM, be independent of each other, do not need the ECM bag is carried out too much change, only need in scrambled content, to extract scrambling ECM bag, so implement easier in terminal.
More than to what the embodiment of the invention provided, be described in detail, used specific case herein principle of the present invention and execution mode set forth, the explanation of above embodiment just is used for help understanding method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. one kind based on the condition receiving method under the secret skill art, it is characterized in that described method comprises:
After first headend equipment of first order platform carries out scrambling and encryption to the video/audio of first order platform, data are carried out multiplexing process generate first order television programme data, and be sent to second headend equipment of second level platform;
After second headend equipment carries out scrambling and encryption to the video/audio of first order television programme data and second level platform, data are carried out multiplexing process generate second level television programme data, and be sent to digital TV terminal;
Digital TV terminal receives the second level television programme data that second headend equipment sends, and second level television programme data is carried out descrambling and data decryption, and the television programme data behind the output descrambling is watched for the user.
2. as claimed in claim 1 based on the condition receiving method under the secret skill art, it is characterized in that, after first headend equipment of described first order platform carries out scrambling and encryption to the video/audio of first order platform, data is carried out multiplexing process generate first order television programme data, and second headend equipment that is sent to second level platform comprises:
First headend equipment of first order platform carries out scrambling to the audio, video data at first order platform place, utilize the business cipher key of described first order platform to generate the first authorization control signal, utilize user's distributing key of described first order platform to generate first Entitlement Management Message, generate first order television programme data by data being carried out multiplexing process.
3. as claimed in claim 2 based on the condition receiving method under the secret skill art, it is characterized in that, after described second headend equipment carries out scrambling and encryption to the video/audio of first order television programme data and second level platform, data are carried out multiplexing process generate second level television programme data, and be sent to digital TV terminal and comprise:
Second headend equipment carries out scrambling to first order television programme data as a common program stream to be handled, utilize the business cipher key of described second level platform to generate the second authorization control signal, utilize user's distributing key of described second level platform to generate second Entitlement Management Message, generate second level television programme data by data being carried out multiplexing process.
4. as claimed in claim 3ly it is characterized in that described user's distributing key of utilizing described second level platform generates in second Entitlement Management Message and also comprises based on the condition receiving method under the secret skill art:
Extract first Entitlement Management Message in the first order television programme data, and collect first Entitlement Management Message and second Entitlement Management Message;
Entitlement Management Message presentation manager by second level platform produces one by first Entitlement Management Message of first order platform and the mixing Entitlement Management Message of second Entitlement Management Message;
The EMMG-MUX agreement of described mixing Entitlement Management Message by digital video broadcasting DVB standard is inserted in first order television programme data and the second level television programme data.
5. as claimed in claim 4 based on the condition receiving method under the secret skill art, it is characterized in that, described digital TV terminal receives the second level television programme data that second headend equipment sends, and second level television programme data carried out descrambling and data decryption, and the television programme data behind the output descrambling is watched and being comprised for the user: digital TV terminal at first decrypts the video/audio and the first authorization control signal of second level platform, utilizes the first authorization control decrypted signal to go out the video/audio of first order platform afterwards.
6. one kind based on the condition receiving system under the secret skill art, it is characterized in that, comprising:
First headend equipment of first order platform after being used for video/audio to first order platform and carrying out scrambling and encryption, carries out multiplexing process to data and generates first order television programme data, and be sent to second headend equipment of second level platform;
Second headend equipment of second level platform after being used for video/audio to first order television programme data and second level platform and carrying out scrambling and encryption, carries out multiplexing process to data and generates second level television programme data, and be sent to digital TV terminal;
Digital TV terminal is used to receive the second level television programme data that second headend equipment sends, and second level television programme data is carried out descrambling and data decryption, and the television programme data behind the output descrambling is watched for the user.
7. system as claimed in claim 6, it is characterized in that, first headend equipment of described first order platform is used for the audio, video data at first order platform place is carried out scrambling, utilize the business cipher key of described first order platform to generate the first authorization control signal, utilize user's distributing key of described first order platform to generate first Entitlement Management Message, generate first order television programme data by data being carried out multiplexing process.
8. system as claimed in claim 7, it is characterized in that, described second headend equipment carries out scrambling to first order television programme data as a common program stream to be handled, utilize the business cipher key of described second level platform to generate the second authorization control signal, utilize user's distributing key of described second level platform to generate second Entitlement Management Message, generate second level television programme data by data being carried out multiplexing process.
9. system as claimed in claim 7 is characterized in that, described second headend equipment also is used for extracting first Entitlement Management Message of first order television programme data, and collects first Entitlement Management Message and second Entitlement Management Message; Entitlement Management Message presentation manager by second level platform produces one by first Entitlement Management Message of first order platform and the mixing Entitlement Management Message of second Entitlement Management Message; The EMMG-MUX agreement of described mixing Entitlement Management Message by the DVB standard is inserted in first order television programme data and the second level television programme data.
10. system as claimed in claim 7 is characterized in that, described digital TV terminal at first decrypts the video/audio and the first authorization control signal of second level platform, utilizes the first authorization control decrypted signal to go out the video/audio of first order platform afterwards.
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Application publication date: 20111130 |