CN101335579A - Method implementing conditional reception and conditional receiving apparatus - Google Patents
Method implementing conditional reception and conditional receiving apparatus Download PDFInfo
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- CN101335579A CN101335579A CNA2008101176246A CN200810117624A CN101335579A CN 101335579 A CN101335579 A CN 101335579A CN A2008101176246 A CNA2008101176246 A CN A2008101176246A CN 200810117624 A CN200810117624 A CN 200810117624A CN 101335579 A CN101335579 A CN 101335579A
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Abstract
The invention discloses a method of realizing conditional access. The method includes the following steps: a terminal sends an acquired user key, an entitlement management message (EMM) and an entitlement control message (ECM) to a Conditional Access Module-Card (CAM-C); the CAM-C acquires a control word according to the user key, EMM and ECM, and sends the encrypted control word to the terminal after encrypting the control word; the terminal decrypts the encrypted control word to acquire the control word, and carries out descramble to the received scrambled multimedia program data according to the control word to obtain the multimedia program data. The invention also discloses a conditional access device. The use of the invention can realize the function of conditional access, and ensure the safety of conditional access system.
Description
Technical field
The present invention relates to China mobile multi-media broadcasting technology, method and conditional receiving device that particularly a kind of realization condition receives.
Background technology
In mobile multimedia broadcast system, multimedia programming is handed down to each terminal with the form of broadcasting.Multimedia programming for charge, in order to ensure service provider's interests, require the terminal receiving function that satisfies the requirements, that is: the multimedia program data of charge will be received (CA by condition, Conditional Access) system's scrambling transmission, terminal needs successful descrambling multimedia program data earlier, could normally watch.
Fig. 1 shows the composition structural representation of existence conditions receiving terminal.Referring to Fig. 1, shown in conditional access terminal comprise: demodulation/demultiplexing module, bidirectional interface, Conditional Access Module card (CAM-C, Conditional Access Module-Card), descrambling module, terminal applies module and player etc.The operation principle of conditional access terminal shown in Figure 1 is:
Audio frequency, video and data by scrambling after, with authorization control message (ECM, Entitlement ControlMessage) and entitlement management message (EMM, Entitlement Management Message) etc. modulated together, be multiplexed into broadcast channel, and be broadcasted the demodulation/demultiplexing module of Channel Transmission to the conditional access terminal; Wherein, ECM comprises and the relevant control information of condition reception that EMM comprises and the relevant management information of change viewing card content;
Demodulation/demultiplexing module carries out the information that receives after demodulation, the demultiplexing audio frequency after the resulting scrambling, video and data being sent to descrambling module, and resulting ECM and EMM are sent to CAM-C;
Described EMM also can be handed down to bidirectional interface in the terminal by auxiliary two-way channel, and send to CAM-C by bidirectional interface, in addition, terminal also can be passed through this bidirectional interface and registration center's interaction registration information, obtain user key, this user key is the key relevant with user identity, is used for EMM is decrypted;
CAM-C is used for the realization condition receiving function, particularly, CAM-C is used for according to the user key that comes from registration center the EMM that receives being decrypted and obtains business cipher key, sends to descrambling module then with the business cipher key deciphering controlled word of ECM (CW), and with resulting control word;
Descrambling module is used for carrying out descrambling according to audio frequency, video and the data of control word after to scrambling, obtain original audio frequency, video and data, and resulting Voice ﹠ Video is sent to player play, data send to processing that the terminal applies module is correlated with and present.
Above-mentioned descrambling module can realize that CAM-C is then realized by special safety chip by software or hardware mode.By the operation principle of above-mentioned conditional access terminal as seen, CAM-C need pass to descrambling module with control word, could realize descrambling, therefore, guarantee that the interface safety between CAM-C and the descrambling module is extremely important for condition receives multimedia program data.
Descrambling module in the existence conditions receiving terminal and CAM-C are an integral body physically, shown in Fig. 1 frame of broken lines.Under this structure, the interface between CAM-C and the descrambling module is confidential, and the data of this interface are difficult to be intercepted and captured, thereby can guarantee the safe transmission of control word.
Because CAM-C is by being deployed in wherein security algorithm realization condition receiving function, different CA manufacturers can provide different security solutions, for support terminal switches between the CAM-C of multiple CA manufacturer, CAM-C need be separated from conditional access terminal.If in order to guarantee the fail safe of interface between descrambling module and the CAM-C, the function of descrambling module is also separated in the lump, then can be caused following problem:
On the one hand, the data volume that descrambling module need be handled is bigger, operand is also bigger, if the function of descrambling module is separated from terminal, places safety chip to realize, safety chip be can't bear the heavy load;
On the other hand, what descrambling module was realized is standardized Descrambling Algorithms, and CAM-C then is privately owned security algorithm, and descrambling module and CAM-C are arranged on the same physical entity, is not easy to the upgrading of descrambling function and the extensibility of raising CAM-C.
Therefore, preferable way is that the function with descrambling module still places terminal to realize, and the function of CAM-C is separated from terminal, is realized by safety chip.Yet, in case descrambling module is geographically separated with CAM-C, the interface between descrambling module and the CAM-C just has been exposed to the listener-in, and the control word of transmitting on this interface may be by illegal wiretapping, this will bring serious destruction to whole C A system, make that even the CA system is cracked.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of realization condition reception, with the realization condition receiving function, and the fail safe of guarantee condition receiving system.
Another object of the present invention is to provide a kind of conditional receiving device, with the realization condition receiving function, and the fail safe of guarantee condition receiving system.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
The method that a kind of realization condition receives comprises:
Terminal sends to Conditional Access Module card CAM-C with user key, entitlement management message EMM and the authorization control message ECM that gets access to;
CAM-C will send to terminal after the described control word encryption according to the controlled word of described user key, EMM and ECM;
Terminal is decrypted controlled word to encrypted control word, and carries out descrambling according to the multimedia program data of the control word that obtains after to the scrambling that receives, and obtains multimedia program data.
Further,, when sending user key, CAM-C can comprise: the PKI of terminal is sent to CAM-C in terminal;
Described CAM-C encrypt control word mode can for: with the PKI that is received from terminal described control word is encrypted;
The mode that described terminal is decrypted the control word after encrypting can for: the private key with terminal is decrypted described encrypted control word.
Preferably, terminal obtain user key mode can for:
CAM-C sends to terminal with the identification information of self;
Terminal sends to registration center with the identification information of CAM-C and the identification information of terminal self;
Registration center carries out safety certification according to the identification information that is received from the CAM-C of terminal carries out safety certification, terminal to described CAM-C identification information to terminal, after described safety certification is all legal, user key is sent to terminal.
Further, when terminal sends to registration center with the identification information of the identification information of CAM-C and terminal self, can comprise: the PKI of terminal is sent to registration center;
Described registration center with the mode that user key sends to terminal is: registration center encrypts described user key with the PKI of described terminal, and the user key after will encrypting sends to terminal.
Preferably, the identification information of described CAM-C can be the identifier of CAM-C;
The identification information of described terminal can be described identifiers of terminals.
In the said method, described terminal geographically can be separated with described CAM-C.
A kind of conditional receiving device comprises: terminal and Conditional Access Module card CAM-C, wherein:
Described terminal, be used to obtain user key, and reception entitlement management message EMM and authorization control message ECM, described user key, EMM and ECM are sent to CAM-C, and be used to receive encrypted control word from CAM-C, and described encrypted control word is decrypted controlled word, also be used to receive the multimedia program data after the scrambling, the multimedia program data of the control word that obtains according to described deciphering after to described scrambling carries out descrambling, obtains multimedia program data;
Described CAM-C is used to receive user key, EMM and the ECM of self terminal, and is used for the controlled word according to described user key, EMM and ECM, sends to terminal after described control word is encrypted.
Preferably, can comprise in the described terminal: deciphering module and descrambling module comprise among the described CAM-C: encrypting module and conditional access module, wherein:
Described deciphering module sends to encrypting module with PKI, user key, EMM and the ECM of terminal, described encrypting module sends to conditional access module with described user key, EMM and ECM, described conditional access module is according to the controlled word of described user key, EMM and ECM, and described control word is returned to described encrypting module;
From the PKI of deciphering the terminal of module the control word that conditional access module returns has been encrypted since the described encrypting module, described encrypted control word is sent to described deciphering module, described deciphering module with the private key of terminal to from encrypting module, encrypted control word is decrypted controlled word, and described control word is sent to descrambling module;
Described descrambling module obtains multimedia program data according to carrying out descrambling from the control word of the deciphering module multimedia program data after to scrambling.
May further include in the described terminal: Registering modules, be used to receive identification information from the CAM-C of CAM-C, the identification information of CAM-C and the identification information of terminal self are sent to registration center, and be used to receive the user key that registration center returns, described user key is sent to deciphering module.
Preferably, described Registering modules, can also be used for the PKI of terminal is sent to registration center, and be used to receive user key that registration center returns, after encrypting, be decrypted with the private key of the described terminal user key after to described encryption and obtain user key.
In the said apparatus, described terminal geographically can be separated with described CAM-C.
As seen from the above technical solution, method and conditional receiving device that realization condition provided by the invention receives, by encrypted transmission control word between CAM-C and terminal, on the one hand, the condition receiving function of order is independent of terminal, is independently finished by CAM-C, on the other hand, make CAM-C can safely control word be passed to descrambling module in the terminal realizing descrambling, thereby in the realization condition receiving function, ensured the fail safe of condition receiving system multimedia program data.
As seen, even descrambling module geographically separates with CAM-C, interface between descrambling module and the CAM-C has been exposed to the listener-in, but, because the present invention has carried out encryption during the transmitting control word between terminal and CAM-C, improved the anti-attack ability of transmitted information, thereby, fail safe that can the guarantee condition receiving system.
In addition, method and conditional receiving device that realization condition provided by the present invention receives, be not only applicable to the scene that CAM-C separates with descrambling module physical location in the terminal, be equally applicable to the higher scene of security requirement that other receive condition, in order to the realization condition receiving function, and the fail safe of guarantee condition receiving system.
Description of drawings
Fig. 1 shows the composition structural representation of existence conditions receiving terminal;
Fig. 2 is the schematic flow sheet of the method for realization condition reception of the present invention;
Fig. 3 is the schematic flow sheet of the method for the present invention's one preferable realization condition reception;
Fig. 4 is the composition structural representation of conditional receiving device of the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
Main thought of the present invention is between CAM-C and descrambling module, by the encrypted transmission control word, make: CAM-C can finish the condition receiving function normally, independently on the one hand, on the other hand, can safely control word be passed to descrambling module, thereby in the realization condition receiving function, ensured the fail safe of condition receiving system.
Fig. 2 is the schematic flow sheet of the method for realization condition reception of the present invention.Referring to Fig. 2, this method comprises:
Step 201: terminal sends to CAM-C with user key, EMM and the ECM that gets access to;
Step 202:CAM-C will send to terminal after the described control word encryption according to the controlled word of described user key, EMM and ECM;
Step 203: terminal is decrypted controlled word to encrypted control word, and carries out descrambling according to the multimedia program data of the control word that obtains after to the scrambling that receives, and obtains multimedia program data.
In said method, CAM-C need carry out encrypted transmission to control word, and described encryption can adopt various cryptographic algorithm of the prior art to carry out, and for the consideration of fail safe aspect, preferably, can adopt public key cryptography mechanism to realize.For this reason, terminal need be supported public key cryptography mechanism, possesses the PKI and the right function of private key key that produce terminal.Because the public and private key key of terminal is to, at random generation independent by each terminal, therefore, generally, the key of any two terminals is very little to identical probability.For fear of the key of two terminals identical situation is taken place, produce public and private key key to the time can produce according to the identification information of terminal, avoid key to identical by the uniqueness of terminal identification information.
In step 201, when terminal when CAM-C sends user key, the PKI of terminal can be sent to CAM-C, so, in step 202, when CAM-C need encrypt control word, can use the PKI of terminal, like this, in step 203, terminal just can be decrypted encrypted control word with the private key of terminal, controlled word.
In the above-mentioned steps 202, CAM-C can be according to prior art from the controlled word of user key, EMM and ECM, particularly: at first according to user key EMM is decrypted and obtains business cipher key, then with the controlled word of business cipher key deciphering ECM.
Before above-mentioned steps 201, terminal need get access to user key, and terminal can be obtained user key in the following manner:
At first, by CAM-C self identification information is sent to terminal;
Then, by terminal the identification information of CAM-C and the identification information of terminal self are sent to registration center;
At last, according to the identification information that is received from the CAM-C of terminal carries out safety certification, terminal to CAM-C identification information described terminal is carried out safety certification by registration center, and after described two kinds of safety certifications are all legal, user key is sent to terminal.
Certainly, be the further fail safe of raising system, when terminal sends to registration center at the identification information with the identification information of CAM-C and terminal self, the PKI of terminal can be sent to registration center in the lump; And registration center also earlier after the public key encryption with terminal, sends when sending user key to terminal again.
Preferably, the identification information of described CAM-C be can this CAM-C of unique identification information, for example: the identifier (ID) that can be CAM-C.Similarly, the identification information of terminal also is can this terminal information of unique identification, for example: the ID of this terminal etc.
The typical application scenarios of said method provided by the present invention is: CAM-C geographically separates with descrambling module in the terminal, but, said method is equally applicable to other higher scenes of security requirement that condition is received, in order to the realization condition receiving function, and the fail safe of guarantee condition receiving system.
Below by a concrete example, the method that realization condition of the present invention is received further describes.The schematic flow sheet of the method that Fig. 3 receives for the preferable realization condition of the present invention one referring to Fig. 3, inserts terminal or terminal at CAM-C and powers on when detecting CAM-C and having inserted terminal, and this method receives according to the following steps condition of carrying out:
Step 301:CAM-C sends to terminal with the identification information of himself.
As previously mentioned, CAM-C is realized by special safety chip usually, and each safety chip all possesses unique ID that is different from other chips, therefore, in this step, the ID of safety chip can be sent to terminal, after terminal receives this ID, can show ID.
Step 302: terminal forms log-on message with the PKI of the identification information of CAM-C, the identification information of terminal self (as device id etc.) and terminal, sends to registration center.
Step 303: registration center carries out safety certification to log-on message, and after authentication is legal, with the equipment PKI user key is encrypted, and the user key after will encrypting sends to terminal.
Step 304: terminal is with the private key decrypted user key of terminal, and this user key is sent to CAM-C together with the PKI of terminal.
Step 305: terminal receives EMM and the ECM information from registration center.
Step 306: terminal sends to CAM-C with EMM and the ECM information that receives.
Step 307:CAM-C decrypts control word according to user key, EMM and ECM, and with the PKI of terminal control word is encrypted, and encrypted control word is sent to terminal.
Step 308: the control word of terminal after with the private key enabling decryption of encrypted, and the control word that obtains sent to descrambling module, to realize descrambling to multimedia program data.
So far, finish the method flow that this preferable realization condition receives.
Corresponding to the method that above-mentioned realization condition receives, the present invention also provides a kind of conditional receiving device.Fig. 4 is the composition structural representation of conditional receiving device of the present invention.Referring to Fig. 4, this device comprises: terminal 410 and CAM-C 420, wherein:
Described terminal 410, be used to obtain user key, and reception EMM and ECM, described user key, EMM and ECM are sent to CAM-C 420, and be used to receive encrypted control word from CAM-C 420, and described encrypted control word is decrypted controlled word, also be used to receive the multimedia program data after the scrambling, the multimedia program data of the control word that obtains according to deciphering after to described scrambling carries out descrambling, obtains multimedia program data;
Described CAM-C 420 is used to receive user key, EMM and the ECM of self terminal 410, and is used for the controlled word according to described user key, EMM and ECM, sends to terminal 410 after described control word is encrypted.
In the conditional receiving device shown in Figure 4, terminal 410 can be divided into: deciphering module 411 and descrambling module 412, and finish the function that control word is decrypted by deciphering module 411, finish the function of multimedia program data being carried out descrambling by descrambling module 412;
CAM-C 420 can be divided into: encrypting module 421 and conditional access module 422, and finish the function that control word is encrypted by encrypting module 421, finish the function that condition receives by conditional access module 422;
Particularly:
The implementation procedure of condition receiving function is: described deciphering module 411 sends to encrypting module 421 with PKI, user key, EMM and the ECM of terminal, described encrypting module 421 sends to conditional access module 422 with described user key, EMM and ECM, described conditional access module 422 is according to the controlled word of described user key, EMM and ECM, and described control word is returned to described encrypting module 421;
The process of safe transmission control word is: from the PKI of deciphering the terminal of module 411 control word that conditional access module 422 returns has been encrypted since the described encrypting module 421, described encrypted control word is sent to described deciphering module 411, described deciphering module 411 with the private key of terminal to from encrypting module 421, encrypted control word is decrypted controlled word, and described control word is sent to descrambling module 412;
The process of multimedia program data being carried out descrambling is: described descrambling module 412 obtains multimedia program data according to carrying out descrambling from the control word of deciphering module 411 multimedia program data after to scrambling.
For the fail safe of guarantee condition receiving system, realize authentication to terminal and card, may further include in the terminal of conditional receiving device shown in Figure 4: Registering modules 413 is used for authenticating to registration center the legitimacy of terminal and card.Particularly:
Registering modules 413, can be used to receive identification information from the CAM-C of CAM-C, the identification information of CAM-C and the identification information of terminal self are sent to registration center, and be used to receive the user key that registration center returns, described user key is sent to deciphering module.
Preferably, described Registering modules 413, can also be used for the PKI of terminal is sent to registration center, and be used to receive user key that registration center returns, after encrypting, be decrypted with the private key of the described terminal user key after to described encryption and obtain user key.
Preferably, the identification information of described CAM-C be can this CAM-C of unique identification information, for example: the ID that can be CAM-C.Similarly, the identification information of terminal also is can this terminal information of unique identification, for example: the ID of this terminal etc.
In the device shown in Figure 4, terminal 410 geographically can be separated with CAM-C420.Geographically do not separate with CAM-C420 for terminal 410, but the scene that the fail safe that condition is received has higher requirements, device shown in Figure 4 is suitable equally.
As seen from the above technical solution, method and conditional receiving device that realization condition provided by the invention receives, by encrypted transmission control word between CAM-C and terminal, on the one hand, the condition receiving function of order is independent of terminal, is independently finished by CAM-C, on the other hand, make CAM-C can safely control word be passed to descrambling module in the terminal realizing descrambling, thereby in the realization condition receiving function, ensured the fail safe of condition receiving system multimedia program data.
As seen, even descrambling module separates physically with CAM-C, interface between descrambling module and the CAM-C has been exposed to the listener-in, but, because the present invention has carried out encryption during the transmitting control word between terminal and CAM-C, improved the anti-attack ability of transmitted information, thereby, fail safe that can the guarantee condition receiving system.
In addition, method and conditional receiving device that realization condition provided by the present invention receives, be not only applicable to the scene that CAM-C separates with descrambling module physical location in the terminal, be equally applicable to the higher scene of security requirement that other receive condition, in order to the realization condition receiving function, and the fail safe of guarantee condition receiving system.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1, a kind of method of realization condition reception is characterized in that, comprising:
Terminal sends to Conditional Access Module card CAM-C with user key, entitlement management message EMM and the authorization control message ECM that gets access to;
CAM-C will send to terminal after the described control word encryption according to the controlled word of described user key, EMM and ECM;
Terminal is decrypted controlled word to encrypted control word, and carries out descrambling according to the multimedia program data of the control word that obtains after to the scrambling that receives, and obtains multimedia program data.
2, method according to claim 1 is characterized in that,, further comprises: the PKI of terminal is sent to CAM-C when CAM-C sends user key in terminal;
The mode that described CAM-C encrypts control word is: with the PKI that is received from terminal described control word is encrypted;
Described terminal to the mode that the control word after encrypting is decrypted is: the private key with terminal is decrypted described encrypted control word.
3, method according to claim 1 and 2 is characterized in that, the mode that terminal is obtained user key is:
CAM-C sends to terminal with the identification information of self;
Terminal sends to registration center with the identification information of CAM-C and the identification information of terminal self;
Registration center carries out safety certification according to the identification information that is received from the CAM-C of terminal carries out safety certification, terminal to described CAM-C identification information to terminal, after described safety certification is all legal, user key is sent to terminal.
4, method according to claim 3 is characterized in that, when terminal sends to registration center with the identification information of the identification information of CAM-C and terminal self, further comprises: the PKI of terminal is sent to registration center;
Described registration center with the mode that user key sends to terminal is: registration center encrypts described user key with the PKI of described terminal, and the user key after will encrypting sends to terminal.
5, method according to claim 3 is characterized in that:
The identification information of described CAM-C is: the identifier of CAM-C;
The identification information of described terminal is: described identifiers of terminals.
6, method according to claim 1 and 2 is characterized in that:
Described terminal is geographically separated with described CAM-C.
7, a kind of conditional receiving device is characterized in that, comprising: terminal and Conditional Access Module card CAM-C, wherein:
Described terminal, be used to obtain user key, and reception entitlement management message EMM and authorization control message ECM, described user key, EMM and ECM are sent to CAM-C, and be used to receive encrypted control word from CAM-C, and described encrypted control word is decrypted controlled word, also be used to receive the multimedia program data after the scrambling, the multimedia program data of the control word that obtains according to described deciphering after to described scrambling carries out descrambling, obtains multimedia program data;
Described CAM-C is used to receive user key, EMM and the ECM of self terminal, and is used for the controlled word according to described user key, EMM and ECM, sends to terminal after described control word is encrypted.
8, device according to claim 7 is characterized in that, comprises in the described terminal: deciphering module and descrambling module comprise among the described CAM-C: encrypting module and conditional access module, wherein:
Described deciphering module sends to encrypting module with PKI, user key, EMM and the ECM of terminal, described encrypting module sends to conditional access module with described user key, EMM and ECM, described conditional access module is according to the controlled word of described user key, EMM and ECM, and described control word is returned to described encrypting module;
From the PKI of deciphering the terminal of module the control word that conditional access module returns has been encrypted since the described encrypting module, described encrypted control word is sent to described deciphering module, described deciphering module with the private key of terminal to from encrypting module, encrypted control word is decrypted controlled word, and described control word is sent to descrambling module;
Described descrambling module obtains multimedia program data according to carrying out descrambling from the control word of the deciphering module multimedia program data after to scrambling.
9, device according to claim 8 is characterized in that, further comprises in the described terminal:
Registering modules, be used to receive identification information from the CAM-C of CAM-C, the identification information of CAM-C and the identification information of terminal self are sent to registration center, and be used to receive the user key that registration center returns, described user key is sent to deciphering module.
10, device according to claim 9 is characterized in that:
Described Registering modules also is used for the PKI of terminal is sent to registration center, and is used to receive user key that registration center returns, after encrypting, is decrypted with the private key of the described terminal user key after to described encryption and obtains user key.
11, according to each described device of claim 7 to 10, it is characterized in that:
Described terminal is geographically separated with described CAM-C.
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| CNA2008101176246A CN101335579A (en) | 2008-08-01 | 2008-08-01 | Method implementing conditional reception and conditional receiving apparatus |
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| CN102223582A (en) * | 2010-04-16 | 2011-10-19 | 施郁锵 | Decrypting descrambling device, decrypting descrambling method and disposing method |
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| CN102223582B (en) * | 2010-04-16 | 2014-09-17 | 施郁锵 | Decrypting descrambling device, decrypting descrambling method and disposing method |
| CN102223582A (en) * | 2010-04-16 | 2011-10-19 | 施郁锵 | Decrypting descrambling device, decrypting descrambling method and disposing method |
| CN103559460A (en) * | 2013-11-06 | 2014-02-05 | 深圳国微技术有限公司 | Condition access module (CAM) and data processing method |
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