CN104104996A - Program stream decryption method, device and terminal - Google Patents
Program stream decryption method, device and terminal Download PDFInfo
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- CN104104996A CN104104996A CN201310115953.8A CN201310115953A CN104104996A CN 104104996 A CN104104996 A CN 104104996A CN 201310115953 A CN201310115953 A CN 201310115953A CN 104104996 A CN104104996 A CN 104104996A
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Abstract
The invention provides a program stream decryption method, a device and a terminal, belonging to the mobile broadcasting television field. The program stream decryption method comprises steps of obtaining business through Wifi network when a client identification module SIM card is not inserted in the terminal, separating the encrypted program stream secret key information from the received broadcasting program stream, utilizing the business secret key to perform decryption on the program stream secret key information to obtain a control word CW, and performing decryption on the received broadcasting programs stream according to the CW. The technical scheme of the invention enables the terminal usage not to be limited by the operator to achieve decryption of the program stream secret key and watching broadcasting programs on the premise that the terminal cost and the network device alternation cost are not increased.
Description
Technical field
The present invention relates to mobile broadcast television field, refer to especially the method for a kind of program stream deciphering and device, terminal.
Background technology
Mobile broadcast television service be by traditional various Transmitting of Multi-media Informations such as audio-video-frequency broadcast content, transport information and news on individual mobile terminal or car-mounted terminal, high-quality voice or diversified data, services are provided, and two-way mobile reception service is provided.
Conventionally, mobile broadcast television service belongs to the business of mobile operator and the cooperation operation of radio and television operator.Radio and television operator transmitting broadcast television signal, and the programme content that launched broadcast television signal is carried is encrypted.Mobile operator is integrated mobile broadcast signal receiving function on individual mobile terminal, make individual mobile terminal can receive broadcast television signal, SIM(client identification module based in individual mobile terminal) card is realized service order, obtain business cipher key, the broadcast television signal receiving with business cipher key deciphering, thus realize watching of TV programme.
The weak point of said method is: individual mobile terminal user uses mobile broadcast television service can be limited by mobile operator.At present, mobile operator and radio and television operator cooperation operation mobile broadcast television service, also do not have the world or the national standard that can jointly observe for each mobile operator, and correlation technique solution belongs to the privately owned solution of each mobile operator.When user selects different mobile operator, mobile broadcast television service just cannot be used.
Certainly, radio and television operator also can independent operation mobile broadcast television service.Radio and television operator, except the broadcast television signal that transmitting is encrypted, can also release the non-individual mobile terminal of not supporting SIM card function, as car-mounted terminal.In car-mounted terminal, the preset condition receiving card (CA card) for broadcast television signal deciphering has been pre-installed decruption key in CA card, with the broadcast television signal that decruption key deciphering receives, can realize watching of TV programme.
The weak point of the method is: the business usage charges that car-mounted terminal user pays are by disposable the collecting of condition receiving card (CA card), cannot realize according to user and use the situation of broadcast television service by using duration or paying by programme content.
Summary of the invention
The technical problem to be solved in the present invention is to provide method, device and the terminal of program stream deciphering in a kind of mobile broadcast television service, do not increasing under the prerequisite of terminal cost and network equipment improvement cost, make the restriction of the use Bu Shou operator of terminal, can realize deciphering program current cipher key, watch broadcast program.
For solving the problems of the technologies described above, embodiments of the invention provide technical scheme as follows:
On the one hand, provide a kind of method of program stream deciphering, comprising:
When terminal is not inserted with client identification module SIM card, by Wifi Network Capture business cipher key;
From the broadcast program stream receiving, distribute the program key stream message of encryption, utilize described business cipher key to be decrypted controlled word CW to described program key stream message;
According to described CW, the broadcast program stream receiving is decrypted.
Further, in such scheme, described when terminal is not inserted with SIM card, by Wifi Network Capture business cipher key, comprise:
By Wifi network, to the business Broadcast Control plateform system in radio network, send current program key request message;
Monitored data broadcast channel, coupling and reception are with the data file of the message SN name of described current program key request message;
From the broadcast program stream receiving, distribute the Entitlement Management Message of encryption;
Utilize the first pre-stored root key to decipher described data file, the key of authorized management information, the secret key decryption Entitlement Management Message with Entitlement Management Message, obtains business cipher key.
Further, in such scheme, in described Entitlement Management Message, also include the term of validity of described business cipher key.
The embodiment of the present invention also provides a kind of device of program stream deciphering, comprising:
Security module, when not being inserted with client identification module SIM card in terminal, by Wifi Network Capture business cipher key, utilizes described business cipher key to be decrypted controlled word CW to described program key stream message;
Program stream descrambling functional module, for being decrypted the broadcast program stream receiving according to described CW.
Further, in such scheme, described device also comprises:
Mobile broadcast receiver module, for receiving broadcast program stream.
Further, in such scheme, described device also comprises:
Wifi communication module, for sending current program key request message by Wifi network to the business Broadcast Control plateform system of radio network, monitored data broadcast channel, coupling and reception, with the data file of the message SN name of described current program key request message, distribute the Entitlement Management Message of encryption from the broadcast program stream receiving;
Described security module is specifically for utilizing the first pre-stored root key to decipher described data file, the key of authorized management information, and the secret key decryption Entitlement Management Message with Entitlement Management Message, obtains business cipher key.
Further, in such scheme, described security module is connected by hardware circuit interface with described mobile broadcast receiver module.
The embodiment of the present invention also provides a kind of terminal, comprises the device of program stream deciphering as above.
Embodiments of the invention have following beneficial effect:
In such scheme, when terminal is not inserted with client identification module SIM card, by Wifi Network Capture business cipher key, utilize the business cipher key obtaining to be decrypted controlled word CW to program key stream message, according to CW, the broadcast program stream receiving is decrypted.Technical scheme of the present invention can not increase under the prerequisite of terminal cost and network equipment improvement cost, makes the restriction of the use Bu Shou operator of terminal, no matter whether terminal is inserted with SIM card, can realize deciphering program current cipher key, watches broadcast program.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of method of the program stream deciphering of the embodiment of the present invention;
Fig. 2 is the structured flowchart of device of the program stream deciphering of the embodiment of the present invention;
Fig. 3 is another schematic flow sheet of method of the program stream deciphering of the embodiment of the present invention.
Embodiment
For technical problem, technical scheme and advantage that embodiments of the invention will be solved are clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
Embodiments of the invention are for the deficiencies in the prior art; method, device and the terminal of program stream deciphering in a kind of mobile broadcast television service are provided; make user when using mobile broadcast television service; neither be subject to the restriction of cooperated mobile operator; be not limited by again non-individual mobile terminal by the restriction of the disposable pickup services usage charges of condition receiving card (CA card); thereby effectively protect mobile broadcast television service user's interests, reduce terminal cost.
Fig. 1 is the schematic flow sheet of method of the program stream deciphering of the embodiment of the present invention, and as shown in Figure 1, the present embodiment comprises:
Step 101, when terminal is not inserted with client identification module SIM card, by Wifi Network Capture business cipher key;
Step 102, from the broadcast program stream receiving, distribute the program key stream message of encryption, utilize described business cipher key to be decrypted controlled word CW to described program key stream message;
Step 103, according to described CW, the broadcast program stream receiving is decrypted.
Further, in another embodiment of the present invention, comprise that, on the basis of above-mentioned steps 101～103, described step 101 comprises:
By Wifi network, to the business Broadcast Control plateform system in radio network, send current program key request message;
Monitored data broadcast channel, coupling and reception are with the data file of the message SN name of described current program key request message;
From the broadcast program stream receiving, distribute the Entitlement Management Message of encryption;
Utilize the first pre-stored root key to decipher described data file, the key of authorized management information, the secret key decryption Entitlement Management Message with Entitlement Management Message, obtains business cipher key.
Further, in such scheme, in described Entitlement Management Message, also include the term of validity of described business cipher key.
The method of program stream deciphering of the present invention, when terminal is not inserted with client identification module SIM card, by Wifi Network Capture business cipher key, utilize the business cipher key obtaining to be decrypted controlled word CW to program key stream message, according to CW, the broadcast program stream receiving is decrypted.Technical scheme of the present invention can not increase under the prerequisite of terminal cost and network equipment improvement cost, makes the restriction of the use Bu Shou operator of terminal, no matter whether terminal is inserted with SIM card, can realize deciphering program current cipher key, watches broadcast program.
Fig. 2 is the structured flowchart of device of the program stream deciphering of the embodiment of the present invention, and as shown in Figure 2, the present embodiment comprises:
Security module 30, when not being inserted with client identification module SIM card in terminal, by Wifi Network Capture business cipher key; From the broadcast program stream receiving, distribute the program key stream message of encryption, utilize described business cipher key to be decrypted controlled word CW to described program key stream message;
Program stream descrambling functional module 20, for being decrypted the broadcast program stream receiving according to described CW.
Further, as shown in Figure 2, described device also comprises:
Mobile broadcast receiver module 10, for receiving broadcast program stream.
Further, in such scheme, described device also comprises:
Wifi communication module 40, for sending current program key request message by Wifi network to the business Broadcast Control plateform system of radio network, monitored data broadcast channel, coupling and reception, with the data file of the message SN name of described current program key request message, distribute the Entitlement Management Message of encryption from the broadcast program stream receiving;
Described security module 30 is specifically for utilizing the first pre-stored root key to decipher described data file, the key of authorized management information, and the secret key decryption Entitlement Management Message with Entitlement Management Message, obtains business cipher key.
Wherein, security module 30 can embed mobile broadcast receiver module 10, or by hardware circuit interface, is connected between security module 30 and mobile broadcast receiver module 10.
The device of program stream deciphering of the present invention, when terminal is not inserted with client identification module SIM card, by Wifi Network Capture business cipher key, utilize the business cipher key obtaining to be decrypted controlled word CW to program key stream message, according to CW, the broadcast program stream receiving is decrypted.Technical scheme of the present invention can not increase under the prerequisite of terminal cost and network equipment improvement cost, makes the restriction of the use Bu Shou operator of terminal, no matter whether terminal is inserted with SIM card, can realize deciphering program current cipher key, watches broadcast program.
The embodiment of the present invention also provides a kind of terminal, comprises the device of program stream deciphering as above.
Below in conjunction with specific embodiment, method, device and the terminal of program stream deciphering of the present invention are described in detail:
The terminal of the embodiment of the present invention includes security module, in security module, preset the first root key and the second root key, wherein the first root key is the key that Entitlement Management Message decruption key is encrypted and is deciphered, the key of the second root key for business cipher key message is encrypted and is deciphered.Wherein, security module can embed mobile broadcast receiver module, or security module is connected by hardware circuit interface with mobile broadcast receiver module.
Terminal also includes program stream descrambling functional module, and program stream descrambling functional module can be arranged in mobile broadcast receiver module, security module, or in multimedia software.
In terminal, can also include mobile communication module, terminal is set up and is communicated by letter with the business management system in mobile communications network by mobile communication module; In terminal, also include Wifi communication module, terminal is set up and is communicated by letter with the business Broadcast Control plateform system in radio network by Wifi communication module.
By the terminal of the embodiment of the present invention, no matter whether terminal is inserted with SIM card, can decipher program current cipher key, watch broadcast program.While there is no mobile communication module in terminal, or when having mobile communication module but not inserting SIM card, the MBBMS(Mobile Broadcast Business Management System communicating by letter with the business management system in mobile communications network, mobile phone TV services management system) middleware module is inoperative, utilize the wifi communication function of terminal, by mobile Internet, set up data with the business Broadcast Control plateform system of radio network and be connected; Business Broadcast Control plateform system receives after the current program key request message of terminal transmission, with the first root key, encrypt EMM(Entitlement Management Message) encryption key, be packaged into data file, and after the message SN named data file with current program key request message, by the data broadcast channel of radio network, to all terminals, broadcast; Terminal sends after current program key request message, the data broadcast channel of listening broadcast network, receive the data file of the same name with the message SN of current program key request message, the first root key data decryption file for terminal, the key of authorized management information, can use the secret key decryption Entitlement Management Message of Entitlement Management Message afterwards, obtain business cipher key, utilize business cipher key to be decrypted controlled word CW to program key stream message, according to CW, the broadcast program stream receiving is decrypted.
While having mobile communication module and terminal to be inserted with SIM card in terminal, MBBMS middleware module works, and utilizes the mobile communication function of terminal, sets up data be connected by mobile communications network with the business management system in mobile communications network; Business management system receives after the business cipher key request message of terminal transmission, to terminal, return to business cipher key message, the second root key deciphering business cipher key message for terminal, obtain business cipher key, utilize business cipher key to be decrypted controlled word CW to program key stream message, according to CW, the broadcast program stream receiving is decrypted.
Wherein, program stream descrambling functional module can write the CW term of validity, and before the CW term of validity, program stream descrambling functional module all can utilize CW to be decrypted broadcast program stream.Program stream descrambling functional module algorithm AES used can be deployed in the CMMB(China Mobile Multimedia Broadcasting of terminal, China Mobile multimedia broadcasting flexibly) module, UAM(User Authentication Module SIM) module or CMMB client.
In technical scheme of the present invention, can set the term of validity of business cipher key or the term of validity of program ordering confirmation, thereby realize the charge to broadcast program.Such as paying user after certain expense, by Entitlement Management Message or business cipher key message, to user, issue the business cipher key of the default term of validity, before the term of validity, with utilizing per family terminal to watch broadcast program; After the term of validity, user need to continue paying to obtain new business cipher key.Can also realize by setting the term of validity of business cipher key or the term of validity of program ordering confirmation the examination of broadcast program and watch function, the duration that examination is watched can be a few minutes, can be also several hours.
As shown in Figure 3, the method for program stream deciphering in embodiment of the present invention mobile broadcast television service, comprises the following steps:
Whether step 301, sense terminals are inserted with SIM card; If had, go to step 305; If no, turn to step 302;
Step 302, terminal send current program key request message, receive current program key message;
Terminal sends current program key request message, refer to that terminal is according to current time and the channel that will watch, generate current program key request message, start the Wifi communication module in terminal, the business Broadcast Control plateform system in radio network sends the current program key request message that carries the request of Entitlement Management Message (EMM) decruption key;
Business Broadcast Control plateform system is when receiving current program key request message, Entitlement Management Message decruption key is encrypted with the first root key, be packaged into the data file of a name of the message SN with current program key request message, and data file is broadcasted to all terminals by data broadcast channel;
Receive current program key message, refer to terminal monitoring data broadcast channel, coupling and reception are with the data file of the message SN name of current program key request message.
Step 303, terminal distribute the Entitlement Management Message of encryption from broadcast program stream;
Step 304, with the first pre-stored root key data decryption file, the key of authorized management information, by its decrypt authorized management information (EMM), obtains business cipher key, and goes to step 307;
Step 305, terminal send business cipher key request message, receive business cipher key message;
Terminal sends business cipher key request, refers to that terminal generates program inventory to be ordered, and sets up data be connected with the mobile communication module in terminal, and the business management system in mobile communications network sends business cipher key request message;
Step 306, in the security module of terminal, by the second root key deciphering business cipher key message, obtain business cipher key;
The program key stream message of step 307, terminal minute stream encryption from broadcast program stream;
Step 308, in the security module of terminal, deciphers program key stream message with business cipher key, controlled word CW;
The security module of step 309, terminal sends Control Word to program stream descrambling functional module, deciphering program stream.
In the embodiment of the present invention, the transfer mode of EMM key data is as follows:
(1), for the mobile terminal that is inserted with SIM card, the business Broadcast Control plateform system of Entitlement Management Message from radio network sends the business management system of mobile operator to, and it is encrypted to business cipher key.Mobile terminal obtains by mobile communications network request.
(2), for the non-moving terminal that is not inserted with SIM card, the business Broadcast Control plateform system of Entitlement Management Message from radio network is directly pushed to terminal by the data broadcast channel of radio network.Terminal is when the Entitlement Management Message by Wifi link request business Broadcast Control plateform system, current program key request message neither transmits by radio network, by mobile network, do not transmit, but directly by Internetwork link, transmit, thereby can not be limited by the SIM card of mobile operator yet.
Technical scheme of the present invention is by preset two root keys in the security module of terminal, do not increasing under the prerequisite of terminal cost and network equipment improvement cost, make the restriction of the use Bu Shou operator of terminal, no matter be individual mobile terminal or car-mounted terminal, can realize deciphering program current cipher key, watch broadcast program.
Many functional parts described in this specification are all called as module, to emphasize more especially the independence of its implementation.
In the embodiment of the present invention, module can realize with software, to carried out by various types of processors.For instance, the executable code module of a sign can comprise one or more physics or the logical block of computer instruction, and for instance, it can be built as object, process or function.However, the executable code of institute's identification module is without being physically located in together, but can comprise and be stored in different different instructions physically, while combining in these command logics, and its composition module and realize the regulation object of this module.
In fact, executable code module can be individual instructions or many instructions, and even can be distributed on a plurality of different code segments, is distributed in the middle of distinct program, and crosses over a plurality of memory devices distributions.Similarly, operating data can be identified in module, and can realize and be organized in the data structure of any suitable type according to any suitable form.Described operating data can be used as individual data collection and is collected, or can be distributed on diverse location and (be included in different storage device), and can only as electronic signal, be present on system or network at least in part.
When module can utilize software to realize, consider the level of existing hardware technique, so module that can realize with software, in the situation that not considering cost, those skilled in the art can build corresponding hardware circuit and realize corresponding function, and described hardware circuit comprises conventional ultra-large integrated (VLSI) circuit or gate array and the existing semiconductor such as logic chip, transistor or other discrete element.Module can also be used programmable hardware device, realizations such as field programmable gate array, programmable logic array, programmable logic device.
In each embodiment of the method for the present invention; the sequence number of described each step can not be for limiting the sequencing of each step; for those of ordinary skills, do not paying under the prerequisite of creative work, the priority of each step is changed also within protection scope of the present invention.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. a method for program stream deciphering, is characterized in that, comprising:
When terminal is not inserted with client identification module SIM card, by Wifi Network Capture business cipher key;
From the broadcast program stream receiving, distribute the program key stream message of encryption, utilize described business cipher key to be decrypted controlled word CW to described program key stream message;
According to described CW, the broadcast program stream receiving is decrypted.
2. the method for program stream deciphering according to claim 1, is characterized in that, described when terminal is not inserted with SIM card, by Wifi Network Capture business cipher key, comprises:
By Wifi network, to the business Broadcast Control plateform system in radio network, send current program key request message;
Monitored data broadcast channel, coupling and reception are with the data file of the message SN name of described current program key request message;
From the broadcast program stream receiving, distribute the Entitlement Management Message of encryption;
Utilize the first pre-stored root key to decipher described data file, the key of authorized management information, the secret key decryption Entitlement Management Message with Entitlement Management Message, obtains business cipher key.
3. the method for program stream deciphering according to claim 2, is characterized in that, also includes the term of validity of described business cipher key in described Entitlement Management Message.
4. a device for program stream deciphering, is characterized in that, comprising:
Security module, for when terminal is not inserted with client identification module SIM card, by Wifi Network Capture business cipher key, from the broadcast program stream receiving, distribute the program key stream message of encryption, utilize described business cipher key to be decrypted controlled word CW to described program key stream message;
Program stream descrambling functional module, for being decrypted the broadcast program stream receiving according to described CW.
5. the device of program stream deciphering according to claim 4, is characterized in that, described device also comprises:
Mobile broadcast receiver module, for receiving broadcast program stream.
6. the device of program stream deciphering according to claim 5, is characterized in that, described device also comprises:
Wifi communication module, for sending current program key request message by Wifi network to the business Broadcast Control plateform system of radio network, monitored data broadcast channel, coupling and reception, with the data file of the message SN name of described current program key request message, distribute the Entitlement Management Message of encryption from the broadcast program stream receiving;
Described security module is specifically for utilizing the first pre-stored root key to decipher described data file, the key of authorized management information, and the secret key decryption Entitlement Management Message with Entitlement Management Message, obtains business cipher key.
7. the device of program stream deciphering according to claim 5, is characterized in that, described security module is connected by hardware circuit interface with described mobile broadcast receiver module.
8. a terminal, is characterized in that, comprises the device of the program stream deciphering as described in any one in claim 4-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310115953.8A CN104104996A (en) | 2013-04-03 | 2013-04-03 | Program stream decryption method, device and terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310115953.8A CN104104996A (en) | 2013-04-03 | 2013-04-03 | Program stream decryption method, device and terminal |
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| CN104104996A true CN104104996A (en) | 2014-10-15 |
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| CN201310115953.8A Pending CN104104996A (en) | 2013-04-03 | 2013-04-03 | Program stream decryption method, device and terminal |
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Application publication date: 20141015 |