CN101247409A - Live broadcast stream media authentication method based on P2P network - Google Patents
Live broadcast stream media authentication method based on P2P network Download PDFInfo
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Abstract
The present invention provides authentication method based on P2Pnetwork living broadcast stream medium, first step: user terminal examines live program information from indexes server, and sends playing certain program demand when process flow starts; second step: indexes server provides connection information of program source provider and information of playing program required digital certificate to user terminal; third step: customer terminal software checks whether or not local installs required digital certificate, if digital certificate has already be mounted, application can be applied at digital certificate server of program provider according to required digital certificate information; four step: program provider executes user authentication according to user demand, and distributes digital certificate to legality user, at the same time executes authentication and management to user; five step: after obtaining digital certificate, user registers in P2Pnetwork for transmitting of living broadcast stream medium, receiving stream medium data for executing decipher, decoding and playing.
Description
Technical field
The present invention relates to implementation method based on encryption of P2P network direct broadcasting flow medium digital and subscription authentication.
Technical background
Along with developing rapidly of Internet technology, become a kind of trend at leisure at transmission over networks video and audio frequency.Internet video live broadcasting has adapted to this development, and more and more obtains everybody attention, is mainly used in to realize the shared broadcast of multi-user to network multimedia file.
P2P (Peer to Peer) is the interconnected meaning of network node equity.Should, the interconnected pattern of principal and subordinate that is parallel to client/server popular on the present internet, P2P has realized the distributed resource utilization and has shared, each node can carry out peer-to-peer communications, can possess simultaneously to the information content receive, send, storage and integrated, and information word data (Metadata) are searched for and function such as searched, node equity is collaborative finishes the work for each.
P2P technological break-through traditional Client/Server pattern, the status of server and effect weaken greatly, have utilized the idling-resource on the network fully, share, aspects such as collaborative work, the network storage have obtained good application.Along with the development of P2P technology, file transfer and download based on P2P have appearred, every computer be client be again server, when downloading again to others' transfer files content.This transmission means has remedied the problem of network bandwidth bottleneck in certain period, has improved efficiency of transmission, has alleviated load of server.This mode also becomes one of popular mode of big file transfer (sharing download) on the present network.
P2P combines with traditional streaming media video program request, can give full play to the effect of numerous client computer, the numerous users on the Internet can directly carry out information exchange, have alleviated load of server, reduced the occupancy of the network bandwidth, had great application prospect.Combine with the stream media technology application of the network direct broadcasting that produced various ways such as IPTV, Web TV, Web broadcast of P2P technology.This application and file transfer have a great difference, mainly be that transmission has real-time, the content of transmission has continuity, each client all has a buffering area, deposit the inside can be for the streaming video content of playing in the time period, along with the continuity of time, new data are constantly read in, and expired data are dropped.Compare with the mode of file transfer, its data block number compares less, and is relative less to taking of computer and Internet resources in the transmission course.In transmission over networks process, constantly duplicate based on P2P and transmit be and corresponding, a continuous packet of time period.
For the transmission of a Streaming Media, everyone has served as the role who receives and send, because the flexibility of this mode, the protection of rights and interests such as feasible legitimacy for some Streaming Medias, copyright protection becomes difficult more.The person has put one fire to do figurines like the beginning, is just burning all uncontrollable big fire on scale and life cycle on the network.A people just can constantly duplicate a media file or live streaming media and propagate in the process of transmission under the unauthorized situation, and everyone has served as the role of bootlegging and transmission in whole process.
Adopted the method and technology of scheduling that the transmission of the P2P between the client in the P2P network is controlled at present in the P2P network direct broadcasting scheme, control strategy commonly used comprises methods such as the authentication of client, mandate, charging, audit, grouping, flow medium function restriction, communication encryption.Realize control by a series of technical measures to the P2P network, the client who participates in the P2P Network Transmission is authenticated, charges, authorizes, for communication encryption is that information transmission between client and dispatch server adopts the mode of cryptographic protocol to carry out, and the Streaming Media restriction is the restriction that the control user is transmitted some streaming media resource.
The technical method of this controlled P2P exists following deficiency: at first be the degree of freedom that the restriction of P2P network and the control strategy that applies is greatly reduced the P2P network, the P2P network efficiently derive from the height opening and freely transmit, so this will inevitably reduce the efficient of P2P Network Transmission greatly, and control and restriction are many more, and efficient is low more.The user and the part legal users that break through after limiting just can have been play, and, download while playing by software is cracked for the user, download behaviors such as back malicious modification, recompile, conversion, propagation and can't avoid.So also do not realize protection for now technically to the Streaming Media copyright.
So a kind of P2P Network Transmission and authentication and method of can realizing propagated for the mandate of digital product and duplicated, protects the copyright of digital product that very important meaning is arranged.
Summary of the invention
The objective of the invention is to overcome the shortcoming of P2P network direct broadcasting prior art; the digital authentication and the implementation method of live streaming media on a kind of P2P network are proposed; realize that the protection of live broadcast stream media content by digital certificate is implemented in safety on the P2P network; free and distribute neatly and transmit; the supplier of live medium can realize user management and the charge of oneself as required simultaneously, can develop digital certificate voluntarily.Prevent transmission and the broadcast of unauthorized user effectively, protect the copyright of live broadcast stream media technically better the live broadcast stream media content.
Of the present inventionly comprise three sub-system objects altogether: P2P index supplier, live broadcast stream media supplier, final live user based on the P2P network direct broadcasting system.Wherein, the live broadcast stream media supplier comprises streaming media server 1, database server 2, certificate server 3; P2P index service supplier comprises database server 4, index server 5, http server 6; Final live user is meant user side software, comprises P2P networking component and media player.
Each subsystem function of P2P network direct broadcasting system of the present invention and flow process are as follows:
The 1st step: flow process begins, and starts the P2P index service; The 2nd step: start live broadcast stream media supplier's service, finish the coding of live broadcast stream media content and utilize the live media data flow of secret key encryption, start the service of certificate server, to P2P index server registration program number ChanelID and required certificate information CAD; The 3rd step: user capture obtains the rendition list from P2P index supplier, sends selected playing programs request; The 4th step: the user searches in the local digital certificate of being stored according to inquiring about the information MSPID that the P2P index service obtains program stream medium living broadcast supplier whether the required digital certificate CAID of selected program is arranged; The 5th step: if there is not required certificate, then apply for digital certificate, accept subscriber authentication, obtain digital certificate or withdraw from current programme televised live to the live broadcast stream media supplier; If successfully obtain required certificate, then participate in the P2P network data and transfer to P2P index service supplier application; The 6th step: whether index service supplier's verified users has the required digital certificate of program, and if comparison digital certificate identifier CAID identical, then by user applies, provides seed list, allows the user to join the P2P Network Transmission.The 7th step: the data flow that buffering receives, utilize the digital certificate that obtains, carry out the deciphering and the decoding of live broadcast stream media; The 8th step: play live medium, flow process finishes.
Mainly by developing function and the described flow process that four functional modules realize above-mentioned three subsystems, they are respectively method of the present invention: subscription authentication functional module, digital certificate management module, index service expansion module, client process module.Wherein subscription authentication functional module, digital certificate management module are deployed in the live broadcast stream media supplier subsystem, and the index expansion module is deployed in the index server, and the client process module is deployed in end user's terminal.The function that each module realizes is as follows:
The function that the subscription authentication functional module is mainly finished is the application of process user for digital certificate, manages and authorizes for the user, for the user who authorizes request is passed to the digital certificate management module; The function that the digital certificate management module is mainly finished is to generate user certificate, and is distributed to the user, and finishes the user who offers after the program data encryption on the P2P network; The function that the index expansion module is mainly finished is programs stored information MSPID, ChanelID, the digital certificate relevant information, each program legal authorization user seed formation, whether the apply for the registration of user of P2P of discriminating has the required digital certificate CAID of program ChanelID, and the user with digital certificate is assigned in the P2P seed formation of corresponding program ChanelID and goes; The function of client process module mainly is after each user of processing receives the data of transmitting in the P2P mode, carries out video decode and broadcast with after the required digital certificate deciphering of program stream data being passed to media play software.
The present invention has following feature:
1, the characteristics that can not accurately control in freedom, opening, the communication process of P2P transmission over networks according to data adopt the method for the live source of media end data stream of encryption to realize safety, free, open, data transmission efficiently on the P2P network.
Advantage is: adopt the encryption based on source end data stream, increased safety of data on the P2P network, realized the digital copyright protecting to live broadcast stream media, realized combining of data security and network-efficient.
2, realized that by the way that network-efficient transmission is separated with the strict authentication of user user's strictness manages accurately, authorize network freedom, opening, combination efficiently, the reliability and the compatibility of system have been improved greatly, can in the same system system, realize the coexistence of multiple live medium, several data library management, multiple Authentication mechanism, have good pardon for present P2P and the stream media technology development situation that a hundred flowers blossom.
3, P2P index service supplier and live broadcast stream media supplier are relatively independent, this make the live broadcast stream media supplier have more wide technology space and more flexibly technological means realize oneself digital certificate and encryption method, this digital certificate also can be the file that is independent of operating system.
4, in user side deciphering, decode and play inseparablely, this has guaranteed that the live broadcast stream media data can not dammed, store and distribute, and has guaranteed the live broadcast stream media safety of data.
Description of drawings
The P2P live broadcast stream media system configuration schematic diagram that Fig. 1 the present invention is suitable for;
Fig. 2 P2P live broadcast stream media system flow block diagram;
The sequential chart of Fig. 3 P2P live broadcast stream media system.
Embodiment
As shown in Figure 1, the P2P live broadcast stream media system that the present invention is suitable for comprises three sub-system objects altogether: P2P index supplier, live broadcast stream media supplier, final live user.Wherein the live broadcast stream media supplier comprises streaming media server 1, database server 2, certificate server 3; P2P index service supplier comprises database server 4, index server 5, http server 6; Final live user is meant user side software, comprises P2P networking component and media player.
Shown in Figure 2 is system flow block diagram involved in the present invention: at first start the P2P index service, start live broadcast stream media supplier's service, finish coding and digital encryption, be ready to certificate server, to P2P index server registration program and required certificate the live broadcast stream media content; User inquiring the rendition list sends playing request, and obtains program stream medium living broadcast supplier's information according to inquiry P2P index service, and whether examination has required digital certificate; If there is not required certificate, then apply for digital certificate to the live broadcast stream media supplier, to P2P index service supplier registration, to participate in the P2P network data and transfer, the data flow that buffering receives utilizes the digital certificate that obtains to carry out the deciphering and the decoding of live broadcast stream media; Play live medium then.
The implementation method sequential of P2P live broadcast stream media of the present invention system is as shown in Figure 3: at first start P2P index server 2, start live broadcast stream media supplier's database server 3, digital certificate server 4, direct broadcast server 5 successively, in start-up course, finish coding and digital encryption 19 by direct broadcast server 5 to the live broadcast stream media content, be ready to certificate 18 according to program to certificate server, to index server registration program and required certificate and become Media Stream seed 20 in the P2P network, system start-up is finished after finishing.Terminal use 1 is by HTTP service-seeking the rendition list 6, send playing request, the program supplier's that reception is returned the information and the information 7 of needed number certificate, and obtain program stream medium living broadcast supplier's information according to inquiry P2P index service, whether examination has required digital certificate; If there is not required certificate, then apply for digital certificate 9 to the live broadcast stream media supplier, realize user's authentication by database server 3 and manage 10 by the live broadcast stream media supplier, generate digital certificate and issue 11 according to user ID to the digital certificate server, carry out the distribution 12 of certificate by the digital certificate server, the terminal use receives the digital certificate that returns of application and is saved in the local system 13, and be registered as into a member 14 in the P2P network to the P2P index server, participating in the P2P network data transfers, the data flow 15 that buffering receives, the digital certificate that utilization is obtained carries out the deciphering and the decoding of live broadcast stream media; Play live medium 16 then.
Below for adopting the embodiment of the inventive method:
1. the system environments of the embodiment of the invention comprises: live broadcast stream media system (live broadcast stream media supplier), P2P network system (P2P index service person), the deciphering of client live broadcast stream media, decoding and Play System.
2. the configuration-system server is served this example for live broadcast stream media and is adopted VideoLAN-VLC media player software kit to dispose flow medium live system.Deployment MySQL Database Systems are used for management and the charge to the user.Dispose the ApacheHTTP service and be used to issue digital certificate.Adopt the issue of mini-SAP-server index for this example of P2P index service supplier, carry out the exploitation of apache expansion module.Adopt VLC media player to play for user terminal, and adopt C to have language to carry out the exploitation of client modules.
3. select based on step 2, select for use Microsoft Visual Studio.net to develop and debug.Development language is selected C/C++ for use, and the module of main exploitation has user's authentication functions module, digital certificate management module, index service expansion module, client process module.
The function that the subscription authentication functional module is mainly finished is the application of process user for digital certificate, manage and authorize for the user, for the user who authorizes request is passed to the digital certificate management module, implementation is to carry out the exploitation of Apache expansion module, use the api function of MYSQL database to carry out the database associative operation, main function interface is defined as follows:
GetUInfo (): the information that obtains the client;
CerCurUser (uID): whether finish active user's management, not sign not is validated user;
GetUKey (uID): obtain the client certificate sign indicating number;
CenCAData (uID): generate the digital certificate file;
The function that the digital certificate management module is mainly finished is to generate user certificate, and is distributed to the user, and finishes the user who offers after the program data encryption on the P2P network, and main function interface is defined as follows:
GenCAdata (ukey, pkey): produce digital certificate, generate digital certificate; EncodeStreamModule (pStreamBuf): encrypting traffic;
RegStreamProfile (chanelID): to index server registration programme information;
The function that the index expansion module is mainly finished is a programs stored information, the digital certificate relevant information, each program legal authorization user seed formation, whether the apply for the registration of user of P2P of discriminating has the required digital certificate of program, and the user with digital certificate is assigned in the P2P seed formation of corresponding program and goes, main function interface is defined as follows:
ProcStreamProfile (chanelID): handle the programme information that the supplier submits to;
GetStreamCAID (chanelID): obtain the required digital certificate identifier of program;
CerCurUserCA (userID, CAID): whether the verification active user has required certificate;
RegSeedGroup (userID, chanelID): the registered user is to the P2P seed formation of respective program;
The function of client process module mainly is after each user of processing receives the data of transmitting in the P2P mode, carry out video decode and broadcast with after the required digital certificate deciphering of program stream data being passed to media play software, main function interface is defined as follows:
ValideCA (chanelID): check whether digital certificate of local number
RequestCA (chanelID, uID): application digital certificate file
DecoderStreamModule (pStreamBuf): decrypted data stream;
ParseStreamModule (pStreamBuf): decode media stream.
4. the method for encrypting traffic can adopt BlowFish, MD5, Secret16, AES, SHA, CRC32, RSA, DES, Vernam etc., this example adopts the method for Vernam to be: at first obtain key value from key file, then the key of intercepting and the same length of plaintext that we need encrypt from this section key.Use a simple xor operation that plaintext and key are carried out computing then, the result who obtains so has been exactly the ciphertext after encrypting.Decrypting process is: owing to be to use xor operation, so deciphering will be very simple, just can decipher as long as use same key that ciphertext is carried out xor operation once more.
5. based on the determining of step 3, carry out functional development and realization according to Fig. 2 and the described thinking of Fig. 3 and step.
The present invention has protected live broadcast stream media to carry out safe transmission and broadcast on free, open P2P network for the digital encryption and the subscription authentication that realize based on the live broadcast stream media of P2P network.Development for the digital copyright protecting of P2P network direct broadcasting Streaming Media has important facilitation and realistic meaning.
Claims (6)
1, a kind of method for authenticating of the live broadcast stream media based on the P2P network is characterized in that:
The 1st step: flow process begins, and user terminal is checked programme televised live information from index server, initiates to play the request of certain program; The 2nd step: index server provides the information of program source supplier's link information and playing programs needed number certificate to user terminal; The 3rd step: whether the needed number certificate is installed by client software examination this locality, if digital certificate has been installed, then tabulate to index server request forwarding person, and join in the P2P network and download and play, if digital certificate is not installed, then apply for to program supplier's digital certificate server according to the needed number certificate information; The 4th step: the program supplier carries out subscription authentication according to user's request, carries out the digital certificate distribution for validated user, and each program supplier can charge and subscription authentication and management according to the situation of oneself; The 5th step: the user obtains the transmission that the digital certificate post-registration carries out live broadcast stream media in the P2P network, and the receiving stream media data are decrypted, decode and play.
2, according to the dynamic authentication and the authorization method of the described Streaming Media of claim 1, it is characterized in that: offer the user on the P2P network after the program supplier encrypts program data, each user need can carry out video decode and broadcast after the digital certificate deciphering with the program supplier after receiving the data that the P2P mode transmits.
3, according to the dynamic authentication and the authorization method of claim 1 or 2 described Streaming Medias, it is characterized in that: have only the user of the digital certificate of applying for that selected program is required just to allow to be registered in the P2P network and transmit; Each user has different mandates on the P2P network node, and the user who has the mandate of same program becomes one group, is free to carry out transfer of data, realizes that the P2P of program is live.
4, according to the dynamic authentication and the authorization method of claim 1 or 2 described Streaming Medias, it is characterized in that:
Provide in the service at program,, at first transfer to the subscription authentication functional module and carry out digital processing before signing power user transmission at program, this functions of modules has: client's information is passed to customer certification system; Generate digital certificate according to the client certificate sign indicating number, carry out the issue of digital certificate; Data stream is encrypted; To index server registration programme information.
5, according to the dynamic authentication and the authorization method of the described Streaming Media of claim 1, it is characterized in that: the data that client software reception P2P mode is transmitted are at first handled deciphering through the digital certificate management module; Used functions of modules has: according to program number and the local digital certificate whether required programs is arranged of needed number certificate identifier examination; The digital certificate of application required programs; Utilize the digital certificate decrypted data stream.
6, according to the dynamic authentication and the authorization method of the described Streaming Media of claim 1, it is characterized in that: on index server, increase the authentication information of all programs of program supplier, comprising: program supplier identifier MSPID, video frequency program ChanelID, the required certificate identifier of program CAID; Increase the service that only authorized user is provided the P2P Network Transmission on the index server, when receiving the request of user P2P Network Transmission, the certificate identifier CAID that the comparison user provides, if the certificate identifier that requires with program is identical, then allow registration, join seed to formation, carry out the P2P transfer of data.
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| CN101815071A (en) * | 2010-04-01 | 2010-08-25 | 北京数码视讯科技股份有限公司 | Method, device and system for applying for digital certificate |
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| CN111556376B (en) * | 2020-03-23 | 2022-06-14 | 视联动力信息技术股份有限公司 | Digital certificate signing and issuing method and device and computer readable storage medium |
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Application publication date: 20080820 |