CN113038196A - Sender device and receiver device for transmitting media data in a communication network - Google Patents
Sender device and receiver device for transmitting media data in a communication network Download PDFInfo
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- CN113038196A CN113038196A CN202110284188.7A CN202110284188A CN113038196A CN 113038196 A CN113038196 A CN 113038196A CN 202110284188 A CN202110284188 A CN 202110284188A CN 113038196 A CN113038196 A CN 113038196A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/254—Management at additional data server, e.g. shopping server, rights management server
- H04N21/2541—Rights Management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/083—Network architectures or network communication protocols for network security for authentication of entities using passwords
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
- H04L67/141—Setup of application sessions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
- H04N21/4627—Rights management associated to the content
Abstract
The invention discloses a sender device for transmitting media data in a communication network, which is arranged as follows: dividing the complete media data stream into a plurality of data segments with random data duration, and issuing each data segment on a random media stream address, wherein before issuing a corresponding data segment, the sending party equipment authenticates the receiving party equipment through a control link between the sending party equipment and the receiving party equipment, and after the authentication is successful, the media stream address for issuing the data segment and the data duration of the data segment are sent to the receiving party equipment through the control link. In the invention, because the media stream address of the data segment of the issued media data stream and the data duration of the issued data segment are randomly changed, only one segment but not all of the media data stream can be obtained even if a certain media stream address is stolen, thereby enhancing the transmission safety of the media stream.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a sender device and a receiver device for transmitting media data in a communication network.
Background
When media streams are transmitted in a communication network, media data may be stolen or damaged, thereby presenting a security risk.
Disclosure of Invention
The present invention is based on the idea of providing a sender device and a receiver device for transmitting media data in a communication network, thereby solving the above-mentioned problems of the prior art.
An embodiment of the present invention provides a sender device for transmitting media data in a communication network, the sender device being configured to:
dividing a complete media data stream into a plurality of data segments with random data duration, and issuing each data segment on a random media stream address, wherein before issuing a corresponding data segment, the sender equipment authenticates the receiver equipment through a control link between the sender equipment and the receiver equipment, and after the authentication is successful, the media stream address for issuing the data segment and the data duration of the data segment are sent to the receiver equipment through the control link.
Optionally, the sender device is specifically configured to:
generating a corresponding nth media stream address, a corresponding nth address update time interval and a data duration of an nth data segment issued at the nth media stream address, before issuing the nth data segment, where the data duration is the nth address update time interval plus an nth positive random number, where n is 1,2,3,4 …,
sending the nth media stream address and the nth data segment to the receiving device in a time-length mode,
publishing said nth data segment at said nth media stream address on a media stream link,
generating the (n + 1) th media stream address, the (n + 1) th address updating time interval and the data duration of the (n + 1) th data segment issued at the (n + 1) th media stream address before the nth address updating time interval is reached, wherein the data duration is the n +1 th address updating time interval plus an (n + 1) th positive random number,
transmitting the (n + 1) th media stream address and the data of the (n + 1) th data segment to the receiver device in a time length, and,
and when the nth address updating time interval is reached, issuing the (n + 1) th data segment on the (n + 1) th media stream address on a media stream link.
Optionally, each address update time interval is smaller than the total duration of a media data stream that has not yet been published.
Optionally, in the authentication process, the sender device receives a receiver device ID and a public key from the receiver device through the control link, if the sender device determines that the receiver device is a valid user according to the receiver device ID, the authentication is successful, and then the sender device sends the media stream address and data segment data encrypted by using the public key to the receiver device for a long time.
Optionally, the sender device comprises a road side unit.
An embodiment of the present invention further provides a receiver device for transmitting media data in a communication network, the receiver device being configured to:
when the receiving side equipment needs to access the media stream, a control link is established with the sending side equipment, a random media stream address used for issuing the data segment and a random data duration of the data segment are received from the sending side equipment through the control link, then the data segment is received on the corresponding media stream address, and after different data segments are received, the receiving side equipment splices different data segments.
Optionally, the receiving device is specifically configured to:
receiving the nth media stream address from the sender device and the data duration of the nth data segment issued at the nth media stream address, where n is 1,2,3,4 …,
receiving the nth data segment at the nth media stream address,
receiving the (n + 1) th media stream address from the sender device and the data duration of the (n + 1) th data segment issued at the (n + 1) th media stream address,
receiving the n +1 th data segment at the n +1 th media stream address, and,
and splicing the nth data segment received at the nth media stream address and the (n + 1) th data segment received at the (n + 1) th media stream address.
Optionally, the receiving device receives different data segments at different media stream addresses in a multi-thread manner.
Optionally, in the authentication process, the receiving side device generates a public key and a private key through an asymmetric cryptographic algorithm, and sends the public key and a receiving side device ID to the sending side device through the control link, and if encrypted data from the sending side device is received through the control link, the receiving side device decrypts the encrypted data through the private key to obtain a media stream address and a data duration of a data segment.
Optionally, the receiver device comprises an onboard T-Box.
The sender device and the receiver device for transmitting media data in a communication network of the embodiments of the present invention have at least the following advantages:
in the invention, the sender device divides the complete media data stream into a plurality of data segments with random data duration, and issues each data segment on the random media stream address, because the media stream address of the data segment issuing the media data stream and the data duration of the issued data segment are randomly changed, only one segment but not all of the media data stream can be obtained even if a certain media stream address is stolen, thereby enhancing the transmission security of the media stream.
In the invention, the sender equipment can authenticate the receiver equipment through the control link to verify whether the receiver equipment is a legal user for receiving the media stream, thereby preventing the illegal user from acquiring the media stream data and enhancing the transmission safety of the media stream.
In the invention, the media stream address and the data duration are encrypted and decrypted by using the symmetric cryptographic algorithm and/or the asymmetric cryptographic algorithm, thereby enhancing the security of the media stream address and further enhancing the transmission security of the media stream.
Drawings
Further details and advantages of the present invention will become apparent from the detailed description provided hereinafter. It is to be understood that the following drawings are merely illustrative and not drawn to scale and are not to be considered limiting of the application, the detailed description being made with reference to the accompanying drawings, in which:
fig. 1 illustrates a process for transmitting media data in a communication network using a control link according to an embodiment of the present invention.
Fig. 2 shows an application of a sender device and a receiver device for transmitting media data in a communication network according to the present invention in the V2X scenario.
Detailed Description
Embodiments of the present invention are described below with reference to the drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of, and enabling description for, those skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Furthermore, it should be understood that the invention is not limited to the specific embodiments described. Rather, any combination of the features and elements described below is contemplated as carrying out the invention, whether or not they relate to different embodiments. Thus, the following aspects, features, embodiments and advantages are merely illustrative and are not considered elements or limitations of the claims except where explicitly recited in a claim.
The general idea of the invention is that an additional Control Link (Control Link) can be established outside the existing Media Data Link. A media streaming link refers to a path through which media data is transmitted between a sender device and a receiver device in a communication network. A control link refers to a path between a sender device and a receiver device in a communication network that transports control data and auxiliary information for enhancing data transport security over a media streaming link. The control link and the media stream link are logically independent of each other. The addition of the control link does not affect the content format of the media data on the media streaming link and the security mechanisms that may be employed by itself. The media stream link and the control link may use various architectures and protocols of the communication network. For example, in a computer communication network, the media streaming link may employ RTSP, RTMP, or the like. The control link may employ PPP or the like. In the process of media data transmission, the sender device divides the complete media data stream into a plurality of data segments with random data duration, and issues each data segment on a random media stream address. The sending side equipment generates a random media stream address, an address updating time interval and the data duration of the data fragment issued on the address, and after authentication is completed through the control link and the receiving side equipment, the media stream address of the issued data fragment and the data duration of the data fragment are sent to the receiving side equipment through the control link. Accordingly, the recipient device receives data segments of the media stream data at different media stream addresses that vary randomly for a random data duration. Because the media stream address of the issued data segment and the data length of the issued data segment are randomly changed, only one segment but not all of the media data stream can be obtained even if a certain media stream address is stolen, thereby enhancing the transmission security of the media stream.
Before sending a new media stream address and the data duration of the data segment each time, the sender device can authenticate the receiver device through the control link to verify whether the receiver device is a legal user for receiving the media stream, so that an illegal user is prevented from acquiring the media stream data, and the transmission safety of the media stream is enhanced.
The sender device and the receiver device may support a cryptographic algorithm, such as a symmetric cryptographic algorithm or an asymmetric cryptographic algorithm, for securing media stream addresses and data time-long information transmitted over the control link. In order to achieve a higher security level, an asymmetric cryptographic algorithm and a symmetric cryptographic algorithm can also be used simultaneously. For example, the public key and the private key of the asymmetric cryptographic algorithm are not used directly for encrypting and decrypting the media stream address and the data duration but are used for encrypting and decrypting the key of the symmetric cryptographic algorithm used for encrypting and decrypting the media data stream address. The media stream address and the data duration are encrypted and decrypted by using a symmetric cryptographic algorithm and/or an asymmetric cryptographic algorithm, so that the security of the media stream address is enhanced, and the transmission security of the media stream is further enhanced.
Based on the above inventive idea of the present invention, fig. 1 illustrates a procedure for transmitting media data in a communication network using a control link according to an embodiment of the present invention. As shown in figure 1 of the drawings, in which,
when the receiver device needs to access the media stream, the receiver device sends an establishment request to the sender device and establishes a control link with the sender device after receiving an establishment reply from the sender device.
After the control link is established, the sending party equipment sends an authentication request to the receiving party equipment through the control link so as to verify whether the receiving party equipment is a legal user for receiving the media stream. After receiving the authentication request of the sender device, the receiver device generates a public key and a private key through an asymmetric cryptographic algorithm, and sends an authentication reply to the receiver device through a control link, wherein the authentication reply comprises a receiver device ID and a public key. And if the sender equipment confirms that the receiver equipment is a legal user according to the ID of the receiver equipment, the authentication is successful.
After the authentication is completed, the sender device generates a first media stream address, a first address update time interval, and a data duration for issuing a first data segment of the media data at the first media stream address. In particular, the sender device may have a random number generator RNG, internal or external, for generating random media stream addresses (random strings) and random address update time intervals. The data duration of the data segment may be embodied in various forms such as time, frame number or data size. The data duration of the first data segment may be the first address update time interval plus the first positive random number.
And then, the sender device sends an update notification to the receiver device through the control link, wherein the update notification comprises the first media stream address encrypted by using the public key and the data duration of the first data segment. And after receiving the update notification, the receiving party equipment obtains the first media stream address and the data duration of the first data segment after decryption by using the private key, and sends an update notification reply to the receiving party equipment. After receiving the update notification reply, the sender device issues a first data segment at a first media stream address of the media stream link. Accordingly, the recipient device accesses a first media stream address of the media stream link to receive the first data segment.
The sender device may detect whether the first address update time interval has expired by means of a timer or a counter, etc. Before the first address update time interval is reached, the sender device generates a second media stream address, a second address update time interval, and a data duration of a second data fragment issued at the second media stream address, where the data duration of the second data fragment may be the second address update time interval plus a second positive random number.
And then, the sending side equipment re-authenticates the receiving side equipment. And after the authentication is successful, the sending party equipment sends an updating notice to the receiving party equipment through the control link, wherein the updating notice comprises the second media stream address encrypted by using the public key and the data duration of the second data segment. And after receiving the update notification, the receiving party equipment obtains the second media stream address and the data duration of the second data segment after decryption by using the private key, and sends an update notification reply to the receiving party equipment. Upon reaching the first address update time interval, the sender device issues a second data segment at a second media stream address of the media stream link. Accordingly, the recipient device accesses a second media stream address of the media stream link to receive a second data segment.
Since the data duration of the first data segment is greater than the first address update time interval (the difference between the two is the first positive random number), when the sender device starts to issue the second data segment at the second media stream address, the receiver device has not finished receiving the first data segment. Thus, the recipient device may receive the data segments at the first media stream address and the second media stream address, for example, in a multi-threaded manner. After receiving the second data segment at the second media stream address, the receiving device splices the first data segment received at the first media stream address and the second data segment received at the second media stream address. The last part of the first data segment received at the first media stream address has a certain data overlap with the first part of the second data segment received at the second media stream address (the size of the data overlap is determined by the first positive random number), and the data overlap can be used for the splicing process.
And then, before reaching the second address updating time interval, the sending side equipment generates a new media stream address, an address updating time interval and data duration, and repeats the authentication and updating processes until the media stream data which needs to be accessed by the receiving side equipment is completely transmitted.
Each randomly generated address update time interval is within a certain range, but should not exceed the total time length of the media data stream which has not been issued yet, and in addition, the address update time interval should not be too small in consideration of network transmission delay. Different levels of security may be provided by controlling the range of address update intervals.
Fig. 2 shows an application of a sender device and a receiver device for transmitting media data in a communication network according to the present invention in the V2X scenario. As shown in fig. 2, a live video application of the V2X network is taken as an example, where the cloud server serves as the sender device and the vehicle serves as the receiver device.
Step 1, the road side unit is accessed into a V2X network.
And 2, the road side camera logs in the cloud server through the proprietary security network, and uploads the road side video to the cloud server.
And 3, accessing the vehicle running at the road side into the V2X network, and requesting to receive the road side video.
And 4, establishing PPP link with the cloud server by the vehicle initiator, authenticating and accessing, generating a public key and transmitting the public key to the cloud server. If the authentication is successful, continuing to step 5; otherwise, ending.
And 5, the cloud server performs random segmentation processing on the road side video to generate a media stream address and data duration of the data fragment, sends the media stream address and the data duration to the vehicle through an MQTT protocol, and starts a timer.
And 6, the vehicle decrypts the media stream address to acquire the media data stream.
And 7, the timer of the cloud server expires, the media stream address and the data duration of the data fragment are randomly updated, and the step 5 is returned.
The technical scheme of the invention is suitable for various communication network scenes, including but not limited to: wired or wireless communication scenarios in computer networks and broadcast television networks.
It should be noted that the above description is only an example and not a limitation of the present invention. In other embodiments of the invention, the method may have more, fewer, or different steps, and the order, inclusion, or functional relationship between the steps may be different from that described and illustrated. For example, in general, multiple steps may be combined into a single step, or a single step may be split into multiple steps. For a person skilled in the art, the sequence of the steps is not changed without creative efforts and is within the protection scope of the invention.
The technical solution of the present invention may be substantially implemented or partially implemented in the prior art, or all or part of the technical solution may be implemented in a software product, which is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor or a microcontroller to execute all or part of the steps of the method according to the embodiments of the present invention.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Although the present invention has been described with reference to the preferred embodiments, it is not to be limited thereto. Various changes and modifications within the spirit and scope of the present invention will become apparent to those skilled in the art from this disclosure, and it is intended that the scope of the present invention be defined by the appended claims.
Claims (10)
1. A sender device for transmitting media data in a communication network, characterized in that the sender device is arranged to:
dividing a complete media data stream into a plurality of data segments with random data duration, and issuing each data segment on a random media stream address, wherein before issuing a corresponding data segment, the sender equipment authenticates the receiver equipment through a control link between the sender equipment and the receiver equipment, and after the authentication is successful, the media stream address for issuing the data segment and the data duration of the data segment are sent to the receiver equipment through the control link.
2. The sender device according to claim 1, wherein the sender device is specifically configured to:
generating a corresponding nth media stream address, a corresponding nth address update time interval and a data duration of an nth data segment issued at the nth media stream address, before issuing the nth data segment, where the data duration is the nth address update time interval plus an nth positive random number, where n is 1,2,3,4 …,
sending the nth media stream address and the nth data segment to the receiving device in a time-length mode,
publishing said nth data segment at said nth media stream address on a media stream link,
generating the (n + 1) th media stream address, the (n + 1) th address updating time interval and the data duration of the (n + 1) th data segment issued at the (n + 1) th media stream address before the nth address updating time interval is reached, wherein the data duration is the n +1 th address updating time interval plus an (n + 1) th positive random number,
transmitting the (n + 1) th media stream address and the data of the (n + 1) th data segment to the receiver device in a time length, and,
and when the nth address updating time interval is reached, issuing the (n + 1) th data segment on the (n + 1) th media stream address on a media stream link.
3. The sender device of claim 2, wherein each address update time interval is less than the total duration of a media data stream that has not yet been published.
4. The sender device of claim 1, wherein in the authentication process, the sender device receives a receiver device ID and a public key from the receiver device through the control link, if the sender device determines that the receiver device is a valid user according to the receiver device ID, the authentication is successful, and then the sender device sends the media stream address and data of the data segment encrypted by the public key to the receiver device for a long time.
5. The sender device of claim 1, wherein the sender device comprises a road side unit.
6. A receiver device for transmitting media data in a communication network, characterized in that the receiver device is arranged to:
when the receiving side equipment needs to access the media stream, a control link is established with the sending side equipment, a random media stream address used for issuing the data segment and a random data duration of the data segment from the sending side equipment are received through the control link, then the data segment is received on the corresponding media stream address of the media stream link, and after different data segments are received, the receiving side equipment splices different data segments.
7. The receiver device of claim 6, wherein the receiver device is specifically configured to:
receiving the nth media stream address from the sender device and the data duration of the nth data segment issued at the nth media stream address, where n is 1,2,3,4 …,
receiving the nth data segment at the nth media stream address,
receiving the (n + 1) th media stream address from the sender device and the data duration of the (n + 1) th data segment issued at the (n + 1) th media stream address,
receiving the n +1 th data segment at the n +1 th media stream address, and,
and splicing the nth data segment received at the nth media stream address and the (n + 1) th data segment received at the (n + 1) th media stream address.
8. The recipient device of claim 6, wherein the recipient device receives different data segments at different media stream addresses in a multi-threaded manner.
9. The receiver device of claim 6, wherein during authentication, the receiver device generates a public key and a private key by an asymmetric cryptographic algorithm and sends the public key and a receiver device ID to the sender device over the control link, and if encrypted data from the sender device is received over the control link, the receiver device decrypts the encrypted data by the private key to obtain a media stream address and a data duration of a data segment.
10. The recipient device of claim 6, wherein the recipient device comprises an in-vehicle T-Box.
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| CN110944228A (en) * | 2018-09-21 | 2020-03-31 | 中国移动通信有限公司研究院 | Video stream protection method, device and storage medium |
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