CN101651549A - Multimedia broadcasting system, method and system for safely playing multimedia broadcasting contents - Google Patents
Multimedia broadcasting system, method and system for safely playing multimedia broadcasting contents Download PDFInfo
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Abstract
The invention provides a multimedia broadcasting system, a method and a system for safely playing multimedia broadcasting contents, in particular relates to a terminal system for safely playing the multimedia broadcasting contents. The terminal system for safely playing the multimedia broadcasting contents comprises an encrypted related information extracting module and a channel and multiplexingcontrol information decrypting module, wherein the encrypted related information extracting module is used for extracting an encrypted related message and a channel and multiplexing control information cipher text from received broadcasting information; and the channel and multiplexing control information decrypting module is coupled with the encrypted related information extracting module, and performs the decryption operation on the channel and multiplexing control information cipher text according to the encrypted related message to obtain channel and multiplexing control information. The terminal system for safely playing the multimedia broadcasting contents can prevent illegal contents from being received and broadcasted by encrypting the channel and multiplexing control information.
Description
Technical field
The present invention relates to a kind of multi-media broadcasting system and method, relate in particular to the method and system of in mobile multimedia broadcast system, realizing secure broadcast.
Background technology
Broadcast system, particularly the multi-media broadcasting system of using for mobile terminal or mobile phone is applied in the middle of the various fields in recent years more and more at large.It is professional that these multi-media broadcasting systems have generally comprised the professional and value-added operation of basic operation.For example be that the multimedia operation that television broadcasting, sound radio, electron service instruction and urgent broadcast can be basic at last is professional.And real-time and non real-time data broadcast service as network audio-video broadcasting and finance, traffic and government decree broadcasting, also all are the operation business of multi-media broadcasting system.
Yet broadcast system is when being used widely, and the problem of its fail safe has also further highlighted.For example, how to prevent that transmission network such as wired by controlling, the wireless or satellite of unauthorized person from inserting illegal broadcasted content.The common way that addresses the above problem at present is to insert distinctive mark in broadcast singal; Perhaps, the content that is played is carried out digital signature, and be inserted into to broadcast singal.The former can't guarantee fail safe, though and the latter can solve the safety issue of broadcasted content substantially by said method, but need carry out bigger improvement to present broadcast system and receiving terminal, and owing to relate to the operation of a large amount of digital signature, the data-handling capacity of broadcast system also there is higher requirement.
Summary of the invention
For addressing the above problem, the invention provides a kind of method and system that strengthens the fail safe of multi-media broadcasting system.
The invention provides a kind of method of safely playing multimedia broadcasting contents, be applicable to a broadcast system based on frame structure.Wherein said frame structure is used to carry channel and the multiplexing control information and the multimedia broadcast contents of described broadcast system.This method comprises: receive described channel and multiplexing control information; Encrypt described channel and multiplexing control information to produce channel and multiplexing control information ciphertext; And described channel transmitted with described multimedia broadcast contents with the frame that multiplexing control information ciphertext replaces described channel and multiplexing control information to put into described multi-media broadcasting system.
The present invention provides a kind of method of safely playing multimedia broadcasting contents again, is applicable to a broadcast system based on frame structure.Wherein said frame structure is used to carry channel and the multiplexing control information and the multimedia broadcast contents of described broadcast system.This method comprises: extract a channel and multiplexing control information ciphertext and one certainly in the content of the frame of Jie Shouing and encrypt related news; According to described encryption related news described channel and multiplexing control information ciphertext are decrypted to obtain channel and multiplexing control information; And utilize described channel and multiplexing control information that described broadcasted content is carried out rectification and de-multiplex operation, with the described multimedia broadcast contents of normal play.
The invention provides a kind of terminal system of safely playing multimedia broadcasting contents, it comprises encrypts related news extraction module and channel and multiplexing control information deciphering module.Encrypting the related news extraction module is used for extracting encryption related news and a channel and a multiplexing control information ciphertext from the broadcast message that receives.Channel and multiplexing control information deciphering module are coupled to described encryption related news extraction module, and according to described encryption related news described channel and multiplexing control information ciphertext are decrypted operation to obtain a channel and multiplexing control information.
The present invention also provides a kind of multi-media broadcasting system, and it comprises front end system, broadcast channel and terminal system.Front end system is used to provide multimedia broadcast contents, produces the channel and the multiplexing control information ciphertext of described multi-media broadcasting system and encrypts related news.Broadcast channel is coupled to described front end system to transmit described multimedia broadcast contents, to encrypt related news and channel and multiplexing control information ciphertext.Terminal system is coupled to described broadcast channel, comprises encrypting the related news extraction module, is used for extracting described encryption related news and described channel and multiplexing control information ciphertext from the broadcast message that receives; And channel and multiplexing control information deciphering module, be coupled to described encryption related news extraction module, and described channel and multiplexing control information ciphertext be decrypted operation to obtain a channel and multiplexing control information according to described encryption related news.
The present invention can prevent the reception and the broadcast of illegal contents by encryption channel and multiplexing control information, thereby strengthens the terminal control ability, improves the technical difficulty of unauthorized terminal.
Description of drawings
What Fig. 1 showed is a kind of structural representation that is used for the transmission frame (TF) of multimedia broadcast contents;
What Fig. 2 showed is the structured flowchart of realizing the secure broadcast system of one embodiment of the invention;
Fig. 3 shows is the schematic diagram of hierarchical mode of control encryption system of the secure broadcast system of one embodiment of the invention;
What Fig. 4 showed is the detailed block diagram of the secure broadcast system of one embodiment of the invention shown in Figure 2;
What Fig. 5 showed is the flow chart of the front end of secure broadcast system of the present invention; And
What Fig. 6 showed is the flow chart of the terminal of secure broadcast system of the present invention.
Embodiment
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, cited below particularlyly go out preferred embodiment, and cooperate appended graphicly, be described in detail as follows.
Secure broadcast system and method that the present invention proposes, the processing mode that channel that employing is carried each frame structure (transmission frame) and multiplexing control information are encrypted, produce one and encrypt related news, and will encrypt in related news are inserted into secure broadcast system by certain time interval the transmission frame of broadcast channel.Simultaneously, be provided with corresponding encryption related news extraction unit and channel and multiplexing control information decrypting device, make Mobile Multimedia Broadcasting operator to authorize, make and have only authorization terminal equipment can receive multimedia service at terminal manufacturer in terminal.Because the channel and the multiplexing control information that only need transmission frame is carried are encrypted, and with irrelevant as the multimedia broadcast contents of business information transmission, and can on critical path, not add new module, therefore, existing equipment and system be need not big change.
What Fig. 1 showed is a kind of structure that is used for the transmission frame (TF) of multimedia broadcast contents, TF can comprise a plurality of multiplexed frames (MF0 to MFn), each multiplexed frame includes multiplex frame head, multiplexed frame payload and filler cells, as: multiplexed frame MF0 comprises multiplex frame head MFH0, multiplexed frame payload MFP0 and filler cells MFS0, multiplexed frame MFi comprises multiplex frame head MFHi, multiplexed frame payload MFPi and filler cells MFSi, and the structure of all the other multiplexed frames by that analogy.
The channel of multimedia broadcasting and multiplexing control information generally are stored in the control information table (CIT0 to CITk-1) of the 0th multiplexed frame (MF0), and concrete multimedia broadcast contents then is stored in all the other multiplexed frames.For instance, the control information table of this enforcement can comprise network information table, continues period service duplexing configuration list, continue service allocation list, short-period service duplexing configuration list and short time service allocation table.Understand as persons skilled in the art, the multiplexing control information that has comprised the control information of broadcast channel in the above-mentioned control information table and be used for multiplexing or de-multiplex operation, terminal is if need the normal play broadcasted content, the broadcast message that must use channel in the control information table and multiplexing control information to come rectification and the transmission of demultiplexing front end.The encryption related news that the present invention produced, can be used as a kind of special control information table transmits in multiplexed frame MF0, as be placed among h the control information table CITh, also can transmit, as be placed among the multiplexed sub frame SMFi of multiplexed frame payload MFPi by other multiplexed frames.
What Fig. 2 showed is the structure chart of realizing the secure broadcast system of one embodiment of the invention.Encryption related news of the present invention transmit in secure broadcast system, this secure broadcast system 100 comprises front end system 1, terminal system 2 and 3 three parts of broadcast channel, front end system 1 comprises secure broadcast front terminal system 10, broadcast control module 30, content production and processing module 50, multiplex system 70 and Channel Modulation module 90, and terminal system 2 comprises secure broadcast terminal subsystem 20, demultiplexing system 40 and channel demodulation module 60.
Secure broadcast front terminal system 10 comprises key control module 101, channel and multiplexing control information encrypting module 102, encrypts related news generation module 103 and multiplex system interface 104.
Channel and multiplexing control information encrypting module 102 receive channel and the multiplexing control information that multiplex system 70 sends by multiplex system interface 104, each control information table CIT0 to CITk-1 for example shown in Figure 1, and above-mentioned channel and multiplexing control information are carried out encryption by the control key (CK) that produces at random, with generation channel and multiplexing control information ciphertext.Channel and multiplexing control information encrypting module 102 send to multiplex system 70 with the ciphertext of channel and multiplexing control information by multiplex system interface 104.Simultaneously, use Device keys that control key is carried out encryption,, and send it to encryption related news generation module 103 with generation control key ciphertext.
Encrypt related news generation module 103 the control key ciphertext that channel and multiplexing control information encrypting module 102 send is encapsulated as the encryption related news with certain form, and will encrypt related news and be transferred to multiplex system 70 by multiplex system interface 104.In another embodiment, encrypt the algorithm sign of employed algorithm types in the time of can also comprising these encryption related news of sign generation in the related news, and the encryption parameter that is used to strengthen fail safe, such as initial vector.
The ciphertext of multiplex system 70 receiving broadcast contents, encryption related news and channel and multiplexing control information, and in channel, periodically insert this encryption related news, and be sent to terminal system 2 by Channel Modulation module 90 and broadcast channel 3 by certain multiplexing rule.Need to prove that channel and multiplexing control information ciphertext will substitute channel that unencryption handles and multiplexing control information and be placed among the multiplexed frame payload MFP0 and transmit.
The multiplexed frame of 90 pairs of multiplex systems of Channel Modulation module, 70 outputs carries out modulation operations, so that broadcasted content is transferred to each terminal system that is authorized to 2 by broadcast channel 3.
In terminal system 2, the channel code stream that channel demodulation module 60 receiving front-end systems 1 transmit, and it is carried out sending to secure broadcast terminal subsystem 20 after the demodulation.
Secure broadcast terminal subsystem 20 comprises encrypts related news extraction module 201 and channel and multiplexing control information deciphering module 202.
Encrypt the broadcasted content behind related news extraction module 201 receiving demodulations, and extract wherein the encryption related news and the ciphertext of channel and multiplexing control information send to channel and multiplexing control information deciphering module 202.
Control information deciphering module 202 utilization is encrypted related news the ciphertext of channel and multiplexing control information is decrypted, and the multiplexing control information in channel after will deciphering and the multiplexing control information and channel control information send to demultiplexing system 40 and channel demodulation module 60 respectively.
In present embodiment, use two class keys in the secure broadcast system: control key (CK) and Device keys (DK).
Device keys DK is used for control key CK is encrypted, and producing the control key ciphertext, and this control key ciphertext is encapsulated in encrypts in the related news, gives secure broadcast terminal subsystem 20 by broadcast transmitted.Device keys DK possesses higher security intensity, generally generates and distribution by operation management mechanism off-line, and by the terminal equipment that writes of terminal manufacturer safety.Device keys DK does not generally upgrade, but terminal manufacturer also can be upgraded voluntarily by firmware updating etc.Control key CK is periodically dynamically generated by secure broadcast front terminal system 10, is used for the control information of channel is encrypted, and encrypts the back by Device keys DK and distribute by broadcast channel.
Fig. 3 shows is the schematic diagram of hierarchical mode of the control encryption system of secure broadcast system of the present invention; carry out the layering protection with the key that uses different life to encrypting related news; that is, using system management level L1, authorization control layer L2 and encryption layer L3 successively protect in secure broadcast system.
System management layer L1 realizes Device keys DK presetting in secure broadcast system 100.In step S10, operator is by certain strategy generations/discharge device key DK, and the Device keys DK that authorizes manufacturer that operator is distributed is preset in the terminal system 2 of its manufacturing (step S11).
Authorization control layer L2 realize to encrypt related news from front end system 1 to terminal system 2 safe transmission.In step S20, the Device keys DK that front end system 1 utilizes step S10 to provide encrypts control key CK, and the control key ciphertext is encapsulated in the encryption related news, gives terminal system 2 by broadcast transmitted.At step S21, terminal system 2 is utilized the Device keys DK that authorizes factory pre-set that the control key ciphertext is decrypted and is obtained control key CK.
Encryption layer L3 realize channel and multiplexing control information from front end system 1 to terminal system 2 safe transmission.Among the step S30, front end system 1 uses control key CK that channel and multiplexing control information are encrypted, channel and multiplexing control information that channel and multiplexing control information ciphertext will substitute the unencryption processing are encapsulated in the channel multiplexing frame, are transferred to terminal system 2 by broadcast channel 3.In step S31, obtain channel and multiplexing control information after the control key CK that terminal system 2 utilizes step S21 to obtain deciphers channel and multiplexing control information ciphertext, thereby carry out follow-up broadcast reception operation.
In conjunction with Fig. 2 and Fig. 3 as can be known, the step S10 of Fig. 3, S20 and S30 carry out by secure broadcast front terminal system 10, and step S11, S21 and S31 are carried out by secure broadcast terminal subsystem 20.
What Fig. 4 showed is the detailed block diagram of the secure broadcast system 100 of the embodiment of the invention.Key control module 101 provides Device keys DK, and this Device keys DK is sent to channel and multiplexing control information encrypting module 102.
Channel and multiplexing control information encrypting module 102 comprise first ciphering unit 1021, control key generation unit 1022, Device keys memory cell 1023 and second ciphering unit 1024.
Control key generation unit 1022 periodically generates control key CK and sends it to first ciphering unit 1021 and second ciphering unit 1024.Second ciphering unit 1024 receives control key CK, and utilize control key CK to channel and multiplexing control information by 104 receptions of multiplex system interface, network information table for example shown in Figure 1, lasting period service duplexing configuration list, lasting service allocation list, short-period service duplexing configuration list and short time service allocation table carry out encryption.Cryptographic algorithm can adopt the AES-128-CTR algorithm, will encrypt back generation channel and multiplexing control information ciphertext then and send to multiplex system interface 104.So, the control information table that comprises above-mentioned channel and multiplexing control information will place multiplexed frame MF0 with the form of ciphertext.
Device keys memory cell 1023 receives the also Device keys DK of storage key control module 101 transmissions, and this Device keys DK is sent to first ciphering unit 1021.The control key CK that first ciphering unit, the 1021 receiving equipment key DK and second ciphering unit 1024 produce, and utilize Device keys DK that control key CK is encrypted, cryptographic algorithm can be the key encapsulation algorithm of RFC 3394 definition, to produce the control key ciphertext.Then, first ciphering unit 1021 sends to this control key ciphertext and encrypts related news generation module 103.
The algorithm sign of employed algorithm types when encrypting related news generation module 103 with control key ciphertext, these encryption related news of sign generation, and the encryption parameter that is used to strengthen fail safe is encapsulated as the encryption related news with certain form, and will encrypt related news and be transferred to multiplex system 70 by multiplex system interface 104.
In terminal system 2, the broadcast message that channel demodulation module 60 receives from broadcast channel 3, and send it to secure broadcast terminal subsystem 20.
Encrypt related news extraction module 201 and receive the broadcast message that transmits from channel demodulation module 60, and therefrom extract channel and multiplexing control information ciphertext and be contained in the control key ciphertext of encrypting in the related news, and be sent to control information deciphering module 202.
Control information deciphering module 202 comprises Device keys memory cell 2021, first decrypting device 2022, second decrypting device 2023, demultiplexing interface unit 2024 and rectification interface unit 2025.
The Device keys DK that first decrypting device 2022 receives control key ciphertext and 2021 transmissions of Device keys memory cell is decrypted the control key ciphertext that receives, and the control key CK that will obtain after will deciphering sends to second decrypting device 2023.Second decrypting device 2023 receives control key CK and channel and multiplexing control information ciphertext, and adopts control key CK that channel and multiplexing control information ciphertext are decrypted, with channel and the multiplexing control information after the acquisition deciphering.Second decrypting device 2023 sends to demultiplexing interface unit 2024 and rectification interface unit 2025 with channel and multiplexing control information, to carry out corresponding demodulation multiplexing process, the information after this demodulation and demultiplexing are handled then is sent to channel demodulation module 60 and demultiplexing system 40 respectively.
Below with reference to Fig. 5 and Fig. 6 the flow process that one embodiment of the invention produces and related news and checking encryption related news are encrypted in transmission is described.
As shown in Figure 5, after secure broadcast system begins operation, execution in step S501, secure broadcast front terminal system 10 is receive channel and multiplexing control information at first.At step S503, secure broadcast front terminal system 10 produces control key CK.Then, shown in step S505, channel and multiplexing control information encrypting module 102 use control key CK that channel and multiplexing control information are carried out cryptographic operation, to produce channel and multiplexing control information ciphertext.In step S507, channel and multiplexing control information encrypting module 102 use Device keys DK to encrypt control key CK.Next, shown in step S509, encrypt 103 pairs of control key ciphertexts of related news generation module and other relevant encryption parameter and encapsulate to produce the encryption related news.Then, shown in step S511, will encrypt the multiplexing and modulation of related news and channel and multiplexing control information ciphertext and other broadcasted content, to send to terminal system 2 by broadcast channel 3 according to certain rule.
As shown in Figure 6, at first, in step S601, the broadcast message that encrypting messages extraction module 201 receive channel demodulation modules 60 send, and therefrom extract channel and multiplexing control information ciphertext and encrypt related news; Then, execution in step S603 is decrypted the control key ciphertext of encrypting in the related news according to the Device keys of terminal storage, to obtain control key CK.In step S605, utilize control key CK deciphering channel and multiplexing control information ciphertext, to obtain the plaintext of channel and multiplexing control information.Then, execution in step S607 utilizes channel and multiplexing control information to carry out demultiplexing and conciliates modulation operations.In step S609, terminal 3 is able to play smoothly the broadcasted content that carried out rectification and de-multiplex operation.
Need to prove, be the situation that control key ciphertext and channel and multiplexing control information ciphertext send to terminal system 3 simultaneously in the above description, yet, in actual applications, be not in each transmission frame, all to comprise control key ciphertext and channel and multiplexing control information ciphertext.In general, terminal system 3 only need be decrypted operation to channel and multiplexing control information ciphertext when beginning to receive broadcasted content most, has only channel and multiplexing control information that variation has taken place in follow-up playing process, just need be decrypted operation once more.
The above only is preferred embodiment of the present invention; so it is not in order to limit scope of the present invention; any personnel that are familiar with this technology; without departing from the spirit and scope of the present invention; can do further improvement and variation on this basis, so the scope that claims were defined that protection scope of the present invention is worked as with the application is as the criterion.
Claims (17)
1. the method for a safely playing multimedia broadcasting contents is applicable to a broadcast system based on frame structure, and wherein said frame structure is used to carry channel and the multiplexing control information and the multimedia broadcast contents of described broadcast system, it is characterized in that, comprising:
Receive described channel and multiplexing control information;
Encrypt described channel and multiplexing control information to produce channel and multiplexing control information ciphertext; And
Described channel is transmitted with described multimedia broadcast contents with the frame that multiplexing control information ciphertext replaces described channel and multiplexing control information to put into described multi-media broadcasting system.
2. the method for safely playing multimedia broadcasting contents according to claim 1 is characterized in that, comprising:
Produce a control key at random; And
Utilize described control key to encrypt described channel and multiplexing control information.
3. the method for safely playing multimedia broadcasting contents according to claim 2 is characterized in that, comprising:
One Device keys is provided; And
Utilize described Device keys to encrypt described control key to produce the control key ciphertext.
4. the method for safely playing multimedia broadcasting contents according to claim 3 is characterized in that, comprising: produce one according to described control key ciphertext and encrypt related news, and described encryption related news are inserted in the described transmission frame transmit.
5. the method for safely playing multimedia broadcasting contents according to claim 4 is characterized in that, the algorithm of employed algorithm types sign when described encryption related news also comprise mark encryption, and the encryption parameter that is used to strengthen fail safe.
6. the method for a safely playing multimedia broadcasting contents is applicable to a broadcast system based on frame structure, and wherein said frame structure is used to carry channel and the multiplexing control information and the multimedia broadcast contents of described broadcast system, it is characterized in that, comprising:
In the content of the frame that receives, extract a channel and multiplexing control information ciphertext and one and encrypt related news;
According to described encryption related news described channel and multiplexing control information ciphertext are decrypted to obtain channel and multiplexing control information; And
Utilize described channel and multiplexing control information that described broadcasted content is carried out rectification and de-multiplex operation, with the described multimedia broadcast contents of normal play.
7. the method for safely playing multimedia broadcasting contents according to claim 6 is characterized in that, comprising:
In described encryption related news, parse a control key ciphertext;
Utilize a Device keys to decipher described control key ciphertext to obtain a control key; And
Utilize described control key to decipher described channel and multiplexing control information ciphertext.
8. the method for safely playing multimedia broadcasting contents according to claim 7 is characterized in that, described Device keys is preset in the terminal of described broadcast system.
9. the terminal system of a safely playing multimedia broadcasting contents is characterized in that, comprising:
Encrypt the related news extraction module, be used for extracting one and encrypt related news and a channel and multiplexing control information ciphertext from the broadcast message that receives; And
Channel and multiplexing control information deciphering module are coupled to described encryption related news extraction module, and according to described encryption related news described channel and multiplexing control information ciphertext are decrypted operation to obtain a channel and multiplexing control information.
10. the terminal system of safely playing multimedia broadcasting contents according to claim 9 is characterized in that, also comprises:
Demultiplexing module is coupled to described channel and multiplexing control information deciphering module, and according to the multiplexing control information in described channel and the multiplexing control information the described broadcast message that receives is carried out de-multiplex operation; And
The channel demodulation module is coupled to described channel and multiplexing control information deciphering module, and according to the channel control information in described channel and the multiplexing control information the described broadcast message that receives is carried out the rectification operation.
11. the terminal system of safely playing multimedia broadcasting contents according to claim 9, it is characterized in that, the algorithm of employed algorithm types sign when described encryption related news comprise a control key ciphertext, mark encryption, and the encryption parameter that is used to strengthen fail safe.
12. the terminal system of safely playing multimedia broadcasting contents according to claim 11 is characterized in that, described channel and multiplexing control information deciphering module comprise:
The Device keys memory cell provides a Device keys; And
First decrypting device is deciphered described control key ciphertext to obtain a control key according to described Device keys.
13. the terminal system of safely playing multimedia broadcasting contents according to claim 12, it is characterized in that, described channel and multiplexing control information deciphering module comprise second decrypting device, according to described control key described channel and multiplexing control information ciphertext are decrypted operation to obtain described channel and multiplexing control information.
14. a multi-media broadcasting system is characterized in that, comprising:
Front end system is used to provide multimedia broadcast contents, produces the channel and the multiplexing control information ciphertext of described multi-media broadcasting system and encrypts related news;
Broadcast channel is coupled to described front end system to transmit described multimedia broadcast contents, to encrypt related news and channel and multiplexing control information ciphertext; And
Terminal system is coupled to described broadcast channel, comprising:
Encrypt the related news extraction module, be used for extracting described encryption related news and described channel and multiplexing control information ciphertext from the broadcast message that receives; And
Channel and multiplexing control information deciphering module are coupled to described encryption related news extraction module, and according to described encryption related news described channel and multiplexing control information ciphertext are decrypted operation to obtain a channel and multiplexing control information.
15. multi-media broadcasting system according to claim 14 is characterized in that, described terminal system also comprises:
Demultiplexing module is coupled to described channel and multiplexing control information deciphering module, and according to the multiplexing control information in described channel and the multiplexing control information the described broadcast message that receives is carried out de-multiplex operation; And
The channel demodulation module is coupled to described channel and multiplexing control information deciphering module, and according to the channel control information in described channel and the multiplexing control information the described broadcast message that receives is carried out the rectification operation.
16. multi-media broadcasting system according to claim 14 is characterized in that, the algorithm of employed algorithm types sign when described encryption related news comprise a control key ciphertext, mark encryption, and the encryption parameter that is used to strengthen fail safe.
17. multi-media broadcasting system according to claim 16 is characterized in that, described channel and multiplexing control information deciphering module comprise:
The Device keys memory cell provides a Device keys;
First decrypting device is deciphered described control key ciphertext to obtain a control key according to described Device keys; And
Second decrypting device is decrypted operation to obtain described channel and multiplexing control information according to described control key to described channel and multiplexing control information ciphertext.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103281570A (en) * | 2013-04-25 | 2013-09-04 | 河海大学 | Free recipient number controlled broadcast encryption method |
| CN103458269A (en) * | 2012-05-28 | 2013-12-18 | 中国移动通信集团公司 | Mobile multimedia service access method, hotspot server and mobile multimedia service system |
| CN109005450A (en) * | 2018-07-16 | 2018-12-14 | 广州辉群智能科技有限公司 | A kind of broadcast controlling method and device of broadcasting equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1219401C (en) * | 2003-02-14 | 2005-09-14 | 清华大学 | A method for preventing illegal broadcasting in cable digital TV broadcasting |
| CN100588246C (en) * | 2007-04-05 | 2010-02-03 | 国家广播电影电视总局广播科学研究院 | Identity identification method for digital TV broadcast signal |
-
2008
- 2008-08-15 CN CN200810134669A patent/CN101651549B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103458269A (en) * | 2012-05-28 | 2013-12-18 | 中国移动通信集团公司 | Mobile multimedia service access method, hotspot server and mobile multimedia service system |
| CN103458269B (en) * | 2012-05-28 | 2017-01-25 | 中国移动通信集团公司 | Mobile multimedia service access method, hotspot server and mobile multimedia service system |
| CN103281570A (en) * | 2013-04-25 | 2013-09-04 | 河海大学 | Free recipient number controlled broadcast encryption method |
| CN103281570B (en) * | 2013-04-25 | 2016-04-20 | 河海大学 | The broadcast encryption method of free recipient's controllable quantity |
| CN109005450A (en) * | 2018-07-16 | 2018-12-14 | 广州辉群智能科技有限公司 | A kind of broadcast controlling method and device of broadcasting equipment |
| CN109005450B (en) * | 2018-07-16 | 2021-05-18 | 广州辉群智能科技有限公司 | Broadcast control method and device of broadcast equipment |
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| Publication number | Publication date |
|---|---|
| CN101651549B (en) | 2012-09-05 |
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