CN100544238C - A kind of charging method of digital multimedia broadcasting system and Apparatus and system - Google Patents
A kind of charging method of digital multimedia broadcasting system and Apparatus and system Download PDFInfo
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- CN100544238C CN100544238C CNB2006101120877A CN200610112087A CN100544238C CN 100544238 C CN100544238 C CN 100544238C CN B2006101120877 A CNB2006101120877 A CN B2006101120877A CN 200610112087 A CN200610112087 A CN 200610112087A CN 100544238 C CN100544238 C CN 100544238C
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Abstract
The present invention relates to a kind of charging method and Apparatus and system of digital multimedia broadcasting system, the present invention mainly comprises: utilize SK (service key) that CW (control word) and program pricing information are encrypted, form ECM (Entitlement Control Message) by encrypted CW and program pricing information; And send this ECM to user terminal; At described user terminal described ECM is decrypted processing, and charges according to the program pricing information that deciphering is obtained.The present invention also encrypts pricing information and charging information by SK and PDK on the existing basis that CW is encrypted, and realizes the real time billing function that the user watches program.Realization of the present invention can provide diversified charging way for operator, the flexibility that helps operator to commence business.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of charging method and Apparatus and system of digital multimedia broadcasting system.
Background technology
DMB such as digital TV, mobile video broadcast etc. more and more are subjected to popular liking because digital multimedia service timely can be provided, therefore also receive the concern of operator.Wherein, the charging problem of digital multimedia system is the problem that operator comparatively is concerned about.
At present, digital multimedia system is based on CA system (Conditional Access System, condition receiving system) more and realizes charging in service end.Described CA system comprises three parts of front end CA system, set-top box CA kernel and smart card (also being IC-card, Smart card or CA card), be the important component part of DMB, finish system's program scrambling, user's mandate and authentication by described CA system.Specifically, the CA system solves two problems that DMB charges: the one, how to collect the charges from the user; The 2nd, how to stop the user to watch unwarranted pay channel or the illegal programs that is under an embargo and watches.Specifically tell about existing described CA system below in conjunction with accompanying drawing and realize the principle of chargeing.
The ciphering process of CA system mainly is divided into the two large divisions:
The one, the signal scrambling part.
The random code that CA at first needs to produce by a random code generator is controlled the scrambling of scrambler to signal; Described random code is CW (Control Word, a control word); Produce the pulse of a string certain-length random sequence by described CW afterwards, carry out bitwise operation, upset the digital program stream purpose to reach with digital program stream.
The 2nd, the CW encryption section.
If scrambled signals is at receiving terminal success descrambling, then receiving terminal need with control descrambler at the same CW of scrambling end, therefore, described CW need be sent to receiving terminal.If directly transmit, can there be very big transmission security problem so, therefore need encrypt transmission, and be a kind of multi-layer security mechanism the encryption of described CW to CW.
Described CW is carried out encrypted process can be as shown in Figure 1.To the encryption of CW by SK (Service Key, business cipher key) finishes, be called as ECM (EntitlementControl Message through the CW that encrypts, Entitlement Control Message) passes through multiplexer in the ciphertext, code stream with scrambling transmits, and, also comprise information such as time, program price, program authorization control among the described ECM.As seen, ECM is the management information towards program.Above-mentioned SK encrypts the ground floor of CW being encrypted as of CW, and SK can frequently change usually, also is for strengthening the fail safe that CW transmits as just changing once every one month, doing like this.
The second layer of CW is encrypted promptly by PDK (Personal Distribute Key, individual's distributing key) described SK is encrypted, this ciphertext that encrypt to produce with from SMS (Subscriber ManagementSystem, Subscriber Management System) EMM (the EntitleManage Message that the authorized order that obtains generates by SAS, Entitlement Management Message), described EMM also transmits with the scrambling code stream by multiplexer, and, also comprise authorized user messages such as smart card numbers, mandate time, authorization mechanism among the described EMM.As seen, EMM is user oriented management information.
Above-mentioned ciphering process adopts dual key (SK, PDK) method that CW is encrypted, and purpose is exactly for preventing that above-mentioned key from being intercepted and captured in transport process.Usually, a user distributes pair of secret keys, i.e. SK, PDK.Wherein, SK is a public-key cryptography, only is used for encrypting; PDK is a private cipher key, and this key is stored in the user smart card, is grasped and is used for deciphering by the user.These two keys are formed relation one to one by algorithm, promptly have only the encryption that just can open user's public-key cryptography by the private cipher key of correspondence.Therefore, in the transport process of CW, need not to transmit key, CA is transmitted with deciphering have more fail safe.This transmission decrypting process is called as the digital signature identification process.
Tell about the decrypting process of receiving terminal below:
Because PDK is stored in user's the smart card, therefore at receiving terminal, the deciphering of EMM also is unique, and promptly a smart card can only be deciphered in its relevant EMM information;
Can access all information that are used to separate ECM after the EMM deciphering;
Just obtain CW after the ECM deciphering;
At last, CW is sent in the descrambler in the set-top box, finishes descrambling operation.
Above-mentioned decrypting process is finished in the decryption system of smart card.
In existing service end charge system, for guaranteeing fail safe, adopt the matching method of a machine one card usually, i.e. the subscriber card of a special use of a receiving terminal outfit has limited the person's of decoding the behavior of decoding greatly.The person of decoding must consider the cost of cost and production and release of decoding, thereby reduces the person's of decoding the enthusiasm of decoding, and from the security performance aspect, the CA system of existing DMB can provide security performance preferably.And existing C A system can reach the purpose of differentiation charge by control SK and PDK.But the implementation of this differentiation charge is more single, and operator can only provide usually as the monthly payment charging, by the channel charging, by charging ways such as program chargings, correspondingly, has limited the flexibility that operator commences business.
Summary of the invention
The present invention is directed to the existing single shortcoming of CA system charge method, a kind of charging method and Apparatus and system of digital multimedia broadcasting system are provided, thereby realize the flexible charging of digital multimedia broadcasting system.
Purpose of the present invention realizes by following scheme.
The invention provides a kind of charging method of digital multimedia broadcasting system, comprising:
A, utilize service key SK that the program pricing information is encrypted, form Entitlement Control Message ECM by encrypted program pricing information; Utilize individual distributing key PDK that user's charging information is encrypted, form by encrypted user's charging information and supplement management information DMM with money; Utilize described PDK that described SK is encrypted, form Entitlement Management Message EMM by encrypted SK;
B, with described ECM and DMM, and EMM sends user terminal to;
C, described user terminal utilize described PDK that described DMM and described EMM are decrypted, and obtain deciphering the information that described ECM needs, and described ECM is decrypted processing; And charge according to described program pricing information and the described user's charging information that deciphering is obtained.
Also comprise among the described ECM:
Utilize described SK that control word CW is encrypted the ECM of formation, described CW is used for business datum is encrypted.
Send described DMM to user terminal, comprising:
Repeatedly send described DMM information, comprise in the described DMM information and the corresponding random sequence number of described user's charging information to user terminal.
Described step C comprises:
After user terminal receives described DMM information, preserve and supplement corresponding described random sequence number with money with this;
User terminal receives DMM information in next time, the random sequence number in described random sequence number of preserving and the DMM information that receives is made comparisons, and receive user's charging information in the DMM information different with the random sequence number of preservation.
Described method also comprises:
The information that comprises user's charging information, program pricing information, deciphering and charging algorithm is deposited in the subscriber card.
Described ECM is decrypted processing specifically to be comprised:
ECM is decrypted, obtains CW and program pricing information;
Utilize described CW to carry out descrambling operation.
The present invention also provides a kind of charge information encryption device of digital multimedia broadcasting system, comprising:
Program pricing information ciphering unit is used to utilize SK that the program pricing information is encrypted;
Entitlement Control Message ECM forms the unit, is used for encrypted program pricing information is formed ECM;
User's charging information ciphering unit is used to utilize individual distributing key PDK that user's charging information is encrypted;
DMM forms the unit, is used for encrypted user's charging information is formed DMM;
The SK ciphering unit is used to utilize PDK that described SK is encrypted;
EMM forms the unit, is used for encrypted SK is formed EMM;
The EMM delivery unit is used for sending described EMM to user terminal;
The ECM delivery unit is used for sending described ECM to user terminal;
The DMM delivery unit is used for sending described DMM to user terminal.
Described encryption device also comprises:
The business datum ciphering unit is used to utilize control word CW that business datum is encrypted;
The CW ciphering unit is used to utilize service key SK that CW is encrypted.
Described encryption device also comprises:
Described Entitlement Control Message ECM forms the unit and also is used for encrypted CW is formed ECM;
The described ECM that described ECM delivery unit also is used for forming sends to user terminal, and described ECM comprises encrypted CW and program pricing information.
Each unit is arranged at network side in the described encryption device.
The present invention also provides a kind of charge information decryption device of digital multimedia broadcasting system, comprising:
EMM and DMM decrypting device are used to receive the EMM and the DMM of transmit leg EMM delivery unit and the transmission of transmit leg DMM delivery unit, and utilize PDK that described EMM and DMM are decrypted, and obtain the information that user's charging information and deciphering ECM need;
The ECM decrypting device is used to receive the described ECM that transmit leg ECM delivery unit transmits, and according to the information of decrypted EMM with the described ECM needs of deciphering of DMM acquisition, utilizes SK that described ECM is decrypted, and obtains CW and program pricing information;
The descrambling unit is used to utilize decrypted CW that business datum is carried out descrambling operation.
Described decryption device also comprises:
Information memory cell is used to store the unit that comprises described CW, described program pricing information, described user's charging information.
Each unit in the described decryption device is arranged at user terminal.
The present invention also provides a kind of charge system of digital multimedia broadcasting system, and described system comprises described encryption device and described decryption device, and described encryption device is used for sending enciphered message to described decryption device to after ECM, EMM, the DMM encryption; Described encryption device comprises:
Program pricing information ciphering unit is used to utilize SK that the program pricing information is encrypted;
Entitlement Control Message ECM forms the unit, is used for encrypted program pricing information is formed ECM;
User's charging information ciphering unit is used to utilize individual distributing key PDK that user's charging information is encrypted;
DMM forms the unit, is used for encrypted user's charging information is formed DMM;
The SK ciphering unit is used to utilize PDK that described SK is encrypted;
EMM forms the unit, is used for encrypted SK is formed EMM;
The EMM delivery unit is used for sending described EMM to user terminal;
The ECM delivery unit is used for sending described ECM to user terminal;
The DMM delivery unit is used for sending described DMM to user terminal;
Described decryption device after being used for described ECM, EMM, DMM deciphered one by one, obtains the program pricing information, and charges according to described program pricing information; Described decryption device comprises:
EMM and DMM decrypting device are used to receive the described EMM and the DMM of described EMM delivery unit and the transmission of described DMM delivery unit, and utilize described PDK that described EMM and DMM are decrypted, and obtain the information that user's charging information and the described ECM of deciphering need;
The ECM decrypting device is used to receive the described ECM that described ECM delivery unit transmits, and according to the information of decrypted EMM with the described ECM needs of deciphering of DMM acquisition, utilizes SK that described ECM is decrypted, and obtains CW and program pricing information;
The descrambling unit is used to utilize decrypted CW that business datum is carried out descrambling operation.
The technical scheme that provides by the invention described above as seen, the present invention also encrypts the real time billing function that the realization user watches program to pricing information and charging information by SK and PDK on the existing basis that CW is encrypted.Realization of the present invention can provide diversified charging way for operator, the flexibility that helps operator to commence business.
Description of drawings
Fig. 1 is the cryptographic algorithm schematic diagram of CA system;
Fig. 2 is the cryptographic algorithm schematic diagram that the realization terminal that provides of specific embodiments of the present invention is chargeed;
Fig. 3 is that the pricing information to program that specific embodiments of the present invention provide reaches the flow chart that user's charging information is encrypted and transmitted;
Fig. 4 is the flow chart to the encryption of user's charging information that specific embodiments of the present invention provide;
Fig. 5 is the deciphering flow chart at user terminal that specific embodiments of the present invention provide;
Fig. 6 is the charge information encryption device schematic diagram of the digital multimedia broadcasting system that provides of specific embodiments of the present invention;
Fig. 7 is the charge information decryption device schematic diagram of the digital multimedia broadcasting system that provides of specific embodiments of the present invention;
Fig. 8 is the charge system schematic diagram of the digital multimedia broadcasting system that provides of specific embodiments of the present invention.
Embodiment
The present invention mainly is by CW being encrypted utilizing SK to remove, also the pricing information of program is encrypted, form ECM information by the CW after encrypting with program pricing information and business datum, again this ECM information is sent to the smart card of receiving terminal, reach the purpose of realization flexible charging.
For realizing the terminal billing function, the present invention is by the pricing information to program, encrypt as the pricing information of real-time charging and/or by the pricing information that program charges, thereby prevent that user's malice from distorting pricing information, and freely watch or watch at a low price the behavior of program.Because the present invention's key factor that operator is used to charge, promptly the program price is encrypted, and makes the user can not contact this category information easily, and operator can be carried out as the mode of flexible charging such as charging in real time, monthly payment charging the user.
Simultaneously, for realizing the terminal billing function, charging of the present invention is finished at user terminal, therefore,,, is finished and pays dues by supplementing with money in terminal according to the concrete condition of watching program by the user.Therefore, the present invention also encrypts user's charging information, thereby ensures user's interests.
Specify implementation procedure of the present invention in conjunction with the accompanying drawings.
At first illustrate among the present invention the pricing information of program and the process that user's charging information is encrypted and transmitted in conjunction with Fig. 2 and Fig. 3.
Because the program pricing information is exactly to transmit by ECM originally, but does not encrypt.The present invention is according to the importance of program price in charging, takes way that described program price is encrypted, realizes the further management of operator to chargeing.Therefore, the program pricing information is being encrypted can realized based on original CA system among the present invention, simple and effect significantly.
Further specify the ciphering process of the present invention below in conjunction with Fig. 4 to user's charging information.
The number of times of supplementing with money of described regulation is used to limit that the user allows to carry out within a certain period of time supplements number of times at most with money;
This of step 43, service centre's refusing user's supplemented with money, and process finishes;
After user's paying information was known in step 44, service centre, supplementing with money for this provided a random sequence number, and this sequence number is present in user's charging information, and by PDK user's charging information is encrypted;
The smart card of step 47, user terminal receives and preserves described DMM information, comprises the random number that this is supplemented with money in the described DMM information;
In addition, in above-mentioned processing procedure, after a successful recharging is finished, also need this is supplemented with money and add up, so that follow-uply can judge supplementing number of times with money and whether meeting the requirements of user.
The present invention except that above and other transmit charging information and price and the charging way information by improving existing C A system, if user terminal is a multimode terminal, information such as user's charging information, program pricing information and charging way also can be sent to user terminal by other communication network.Described communication network comprises PHS, GSM, GPRS, EDGE, WCDMA, CDMA2000, TD-SCMDA.In addition, described ECM, EMM, DMM information are removed and can be sent to user terminal by radio network, also can be sent to user terminal by above-mentioned communication network.
More than for what the present invention provided program pricing information and user's charging information are encrypted the process that transmits at network side, similar for the decrypting process of mentioning in decrypting process corresponding on user terminal and the background technology, 5 these decrypting processes of explanation are as follows in conjunction with the accompanying drawings:
The smart card of step 51, user terminal utilizes described PDK deciphering EMM, the DMM relevant with it;
All information that are used to separate ECM be can access after EMM and DMM are decrypted, program pricing information, user's charging information etc. comprised.
For realizing the fail safe of charge system, the present invention removes by above-mentioned encryption and transmits program pricing information and user's charging information, also needs to adopt following method to guarantee the fail safe of charge system:
For preventing that the disabled user from obtaining the relevant information that service center transmits to the user, mainly comprise the information of depositing in the user smart card, should deposit in the special-purpose subscriber card as information such as user's charging information, program pricing information, deciphering and charging way information, comprise that deciphering and processes such as charging finish in the smart card of this subscriber card, like this, for the hardware defence line is erected in the person's of decoding the behavior of decoding one, guarantee the safety of vital strategic secrets.
Providing for relevant information on the basis of safe storage equipment, the subscriber card of a correspondence can also be provided for each user terminal, be that above-mentioned subscriber card can be corresponding one by one with user terminal, like this, even the person of decoding can decode, also need to consider cost of decoding and the risk that may exist, thereby reduce the enthusiasm that the person of decoding decodes, and prevent that fundamentally CW from being decoded.
Because the charge of multimedia broadcasting is not very high relatively, therefore, can reduce the interests that the person of decoding decodes and obtains by limit the highest amount that the user supplements with money at every turn.
In addition, can increase the fail safe of system by the cryptographic algorithm of changing user terminal and service centre within a certain period of time.Wherein, the renewal of cryptographic algorithm can be finished by network.
The present invention can realize multiple charging way, comprising:
Monthly payment is chargeed: the smart card of user terminal is deducted corresponding cost according to the monthly payment pricing information that ECM sends from charging information after receiving SK; Perhaps open and count day from customer service, timing on smart card, behind timing full moon, the smart card bales catch removes corresponding exclusive monthly fee and uses.
Charge by channel: after the user confirms to watch this channel, deduct corresponding cost by described smart card according to the price channel information charging information that ECM sends, and the user is in case confirm to watch this channel content, then the user can not quit the subscription of this channel program voluntarily, and the cycle of quitting the subscription of is determined by operator.
Pressing program charges: the user confirms to watch certain programme content according to listing, and is same, deducts corresponding cost according to this program pricing information that ECM sends from user terminal by described smart card.
Real time billing: promptly watch that according to the user length of Pgmtime charges.Operator regulation chargeable time unit, and the charging rate in the unit interval, and send these charge informations to user terminal by ECM information watch that to the user time of program carries out timing by the user terminal clock.Operator this on the one hand because ECM information is normally in the set time, send once as about 10 seconds, so during real time billing, operator can an integral multiple ECM transmitting time as the unit interval of chargeing, thereby the realization real time billing
Except that above-mentioned four kinds of charging ways, operator can also adopt other charging ways according to actual conditions, as long as information such as corresponding charging rate information are sent to user terminal by ECM information, uses when being chargeed by user terminal.
The present invention also provides a kind of charge information encryption device of a kind of digital multimedia broadcasting system as shown in Figure 6, and described device comprises following each functional unit, and wherein each unit can be arranged at network side:
(1) business datum ciphering unit
Be used to utilize control word CW that business datum is encrypted.
(2) CW ciphering unit
Be used to utilize service key SK that CW is encrypted.
(3) program pricing information ciphering unit
Be used to utilize SK that the program pricing information is encrypted.
(4) ECM forms the unit
Be used for encrypted program pricing information and CW are formed ECM.
(5) ECM transmission unit
Be used for sending described ECM to user terminal, described ECM comprises encrypted CW and program pricing information.
(6) user's charging information ciphering unit
Be used to utilize individual distributing key PDK that user's charging information is encrypted.
(7) DMM forms the unit
Be used for encrypted user's charging information is formed DMM.
(8) DMM delivery unit
Be used for sending described DMM to user terminal.
(9) SK ciphering unit
Be used to utilize described PDK that described SK is encrypted;
(10) EMM forms the unit
Be used for encrypted SK is formed EMM;
(11) EMM delivery unit
Be used for sending described EMM to user terminal.
The present invention also provides a kind of charge information decryption device of a kind of digital multimedia broadcasting system as shown in Figure 7, and described device comprises following each functional unit, and wherein each unit can be arranged at user terminal:
(12) EMM and DMM decrypting device
Be used to receive the described EMM and the DMM of described EMM delivery unit and the transmission of described DMM delivery unit, and utilize described PDK that these two information are decrypted;
(13) ECM decrypting device
Be used to receive the described ECM that described ECM delivery unit transmits, and, utilize described PDK that described ECM is decrypted, obtain CW according to the information of decrypted EMM with the DMM acquisition;
(13) information memory cell
Be used to store the unit that comprises CW, program pricing information, user's charging information.
(14) descrambling unit
Be used to utilize decrypted CW that business datum is carried out descrambling operation.
The present invention also provides a kind of charge system of digital multimedia broadcasting system as shown in Figure 8, and described system comprises described encryption device and described decryption device.
Described encryption device sends enciphered message to described decryption device after ECM, EMM, DMM are encrypted.
After described decryption device is deciphered one by one to described ECM, EMM, DMM, obtain business datum and program pricing information, and charge according to described program pricing information.
In sum, the present invention also encrypts pricing information and charging information by SK and PDK on the existing basis that CW is encrypted, and realizes the real time billing function that the user watches program.Realization of the present invention can provide diversified charging way for operator, the flexibility that helps operator to commence business.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (14)
1, a kind of charging method of digital multimedia broadcasting system is characterized in that, comprising:
A, utilize service key SK that the program pricing information is encrypted, form Entitlement Control Message ECM by encrypted program pricing information; Utilize individual distributing key PDK that user's charging information is encrypted, form by encrypted user's charging information and supplement management information DMM with money; Utilize described PDK that described SK is encrypted, form Entitlement Management Message EMM by encrypted SK;
B, with described ECM and DMM, and EMM sends user terminal to;
C, described user terminal utilize described PDK that described DMM and described EMM are decrypted, and obtain deciphering the information that described ECM needs, and described ECM is decrypted processing; And charge according to described program pricing information and the described user's charging information that deciphering is obtained.
2, method according to claim 1 is characterized in that, also comprises among the described ECM:
Utilize described SK that control word CW is encrypted the ECM of formation, described CW is used for business datum is encrypted.
3, method according to claim 1 is characterized in that, sends described DMM to user terminal, comprising:
Repeatedly send described DMM information, comprise in the described DMM information and the corresponding random sequence number of described user's charging information to user terminal.
4, method according to claim 3 is characterized in that, described step C comprises:
After user terminal receives described DMM information, preserve and supplement corresponding described random sequence number with money with this;
User terminal receives DMM information in next time, the random sequence number in described random sequence number of preserving and the DMM information that receives is made comparisons, and receive user's charging information in the DMM information different with the random sequence number of preservation.
5, method according to claim 1 is characterized in that, described method also comprises:
The information that comprises user's charging information, program pricing information, deciphering and charging algorithm is deposited in the subscriber card.
6, method according to claim 2 is characterized in that, describedly described ECM is decrypted processing specifically comprises:
ECM is decrypted, obtains CW and program pricing information;
Utilize described CW to carry out descrambling operation.
7, a kind of charge information encryption device of digital multimedia broadcasting system is characterized in that, comprising:
Program pricing information ciphering unit is used to utilize SK that the program pricing information is encrypted;
Entitlement Control Message ECM forms the unit, is used for encrypted program pricing information is formed ECM;
User's charging information ciphering unit is used to utilize individual distributing key PDK that user's charging information is encrypted;
DMM forms the unit, is used for encrypted user's charging information is formed DMM;
The SK ciphering unit is used to utilize PDK that described SK is encrypted;
EMM forms the unit, is used for encrypted SK is formed EMM;
The EMM delivery unit is used for sending described EMM to user terminal;
The ECM delivery unit is used for sending described ECM to user terminal;
The DMM delivery unit is used for sending described DMM to user terminal.
8, charge information encryption device according to claim 7 is characterized in that, described encryption device also comprises:
The business datum ciphering unit is used to utilize control word CW that business datum is encrypted;
The CW ciphering unit is used to utilize service key SK that CW is encrypted.
9, charge information encryption device according to claim 8 is characterized in that,
Described Entitlement Control Message ECM forms the unit and also is used for encrypted CW is formed ECM;
The described ECM that described ECM delivery unit also is used for forming sends to user terminal, and described ECM comprises encrypted CW and program pricing information.
10, according to each described charge information encryption device in the claim 7 to 9, it is characterized in that, comprising:
Each unit is arranged at network side in the described encryption device.
11, a kind of charge information decryption device of digital multimedia broadcasting system is characterized in that, comprising:
EMM and DMM decrypting device are used to receive the EMM and the DMM of transmit leg EMM delivery unit and the transmission of transmit leg DMM delivery unit, and utilize PDK that described EMM and DMM are decrypted, and obtain the information that user's charging information and deciphering ECM need;
The ECM decrypting device is used to receive the described ECM that transmit leg ECM delivery unit transmits, and according to the information of decrypted EMM with the described ECM needs of deciphering of DMM acquisition, utilizes SK that described ECM is decrypted, and obtains CW and program pricing information;
The descrambling unit is used to utilize decrypted CW that business datum is carried out descrambling operation.
12, charge information decryption device according to claim 11 is characterized in that, comprising:
Information memory cell is used to store the unit that comprises described CW, described program pricing information, described user's charging information.
13, according to claim 11 or 12 described charge information decryption devices, it is characterized in that, comprising:
Each unit in the described decryption device is arranged at user terminal.
14, a kind of charge system of digital multimedia broadcasting system is characterized in that, described system comprises encryption device and decryption device:
Described encryption device is used for sending enciphered message to described decryption device to after ECM, EMM, the DMM encryption; Described encryption device comprises:
Program pricing information ciphering unit is used to utilize SK that the program pricing information is encrypted;
Entitlement Control Message ECM forms the unit, is used for encrypted program pricing information is formed ECM;
User's charging information ciphering unit is used to utilize individual distributing key PDK that user's charging information is encrypted;
DMM forms the unit, is used for encrypted user's charging information is formed DMM;
The SK ciphering unit is used to utilize PDK that described SK is encrypted;
EMM forms the unit, is used for encrypted SK is formed EMM;
The EMM delivery unit is used for sending described EMM to user terminal;
The ECM delivery unit is used for sending described ECM to user terminal;
The DMM delivery unit is used for sending described DMM to user terminal;
Described decryption device after being used for described ECM, EMM, DMM deciphered one by one, obtains the program pricing information, and charges according to described program pricing information; Described decryption device comprises:
EMM and DMM decrypting device are used to receive the described EMM and the DMM of described EMM delivery unit and the transmission of described DMM delivery unit, and utilize described PDK that described EMM and DMM are decrypted, and obtain the information that user's charging information and the described ECM of deciphering need;
The ECM decrypting device is used to receive the described ECM that described ECM delivery unit transmits, and according to the information of decrypted EMM with the described ECM needs of deciphering of DMM acquisition, utilizes SK that described ECM is decrypted, and obtains CW and program pricing information;
The descrambling unit is used to utilize decrypted CW that business datum is carried out descrambling operation.
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| CNB2006101120877A CN100544238C (en) | 2006-08-29 | 2006-08-29 | A kind of charging method of digital multimedia broadcasting system and Apparatus and system |
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| WO2009086669A1 (en) * | 2007-12-29 | 2009-07-16 | Thomson Licensing | System and method for data transmission |
| CN101826233B (en) * | 2008-03-07 | 2012-05-02 | 北京握奇数据系统有限公司 | Device for remote state management of electronic purse |
| CN101651508B (en) * | 2008-08-15 | 2012-07-04 | 威盛电子(中国)有限公司 | Secure broadcast method, related secure broadcast system and front end system |
| CN101388739B (en) * | 2008-10-24 | 2011-03-02 | 中兴通讯股份有限公司 | Implementing method and apparatus for multimedia broadcast charging |
| JP2011035800A (en) * | 2009-08-05 | 2011-02-17 | National Institute Of Information & Communication Technology | Electronic price-proposing system, electronic price-proposing device, and electronic price-proposing method |
| CN103188222B (en) * | 2011-12-28 | 2016-03-30 | 北大方正集团有限公司 | A kind of method, system and device of data message distribution |
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2006
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