CN116366926A

CN116366926A - Device authentication method, signal source device, display device and chip system

Info

Publication number: CN116366926A
Application number: CN202310204062.3A
Authority: CN
Inventors: 陈顺庆
Original assignee: Rockchip Electronics Co Ltd
Current assignee: Rockchip Electronics Co Ltd
Priority date: 2023-03-06
Filing date: 2023-03-06
Publication date: 2023-06-30

Abstract

The application provides a device authentication method, a signal source device, a display device and a chip system. The device authentication method is applied to signal source devices and comprises the following steps: transmitting a first CEC command to a display device, so that the display device performs a first check on the first CEC command, wherein the first CEC command comprises a first authentication command; and transmitting a multimedia signal to the display device based on the result of the first check. In addition, the device authentication method is applied to a display device, and comprises the following steps: transmitting a first CEC command to a signal source device, so that the signal source device performs a first check on the first CEC command, wherein the first CEC command comprises a first authentication command; receiving a multimedia signal from the source device based on the result of the first verification; and playing based on the multimedia signal. The scheme establishes the connection between the signal source equipment and the display equipment by analyzing the CEC command, thereby achieving the technical effect of equipment handshake identification.

Description

Device authentication method, signal source device, display device and chip system

Technical Field

The present invention relates to the field of display devices, and more particularly to a method capable of verifying a matching display device and signal source device.

Background

A system for signal delivery interaction may include a playback device that generates a data stream and a display device that decodes the data stream for playback and display.

The prior art is still vulnerable to binding between a playback device and a display device. For example, some digital set-top boxes will give away brands of liquid crystal televisions, and because the profit mode of the cable television operators is to collect the use fee (monthly rental fee) of the digital set-top boxes in months, and some other brands of HDMI digital network set-top boxes are used for free, users can use the given-away liquid crystal televisions with other brands of HDMI digital network set-top boxes, so that the interests of the company cannot be guaranteed. Also, for example, the playback device stores confidential content, and in order to prevent the confidential content from being lost or stolen for viewing on other display devices, only authorized display devices are required to be displayed normally. This CEC directly authenticates the playback device and the display device.

In some prior art, digital content can be encrypted in an HDCP (consumer electronics control) manner, and in order to transmit an HDCP authentication result, only the HDCP authentication is needed to be successfully performed, and the CEC transmits the authentication result between the multi-level playing devices. The authentication process is also completed through the encryption and decryption process of the HDCP.

If the authentication result is broken, there may still be a risk of piracy.

Disclosure of Invention

The embodiment of the invention provides a device authentication method, a signal source device, a display device and a chip system, which can authenticate through a CEC mode so as to improve the safety of a playing device.

In a first aspect, a device authentication method is provided, applied to a signal source device. The device authentication method comprises the following steps: transmitting a first CEC command to a display device, so that the display device performs a first check on the first CEC command, wherein the first CEC command comprises a first authentication command; and transmitting a multimedia signal to the display device based on the result of the first check.

In an embodiment of the present application, sending the first CEC command to the display device includes: and sending the first authentication command to the display device through a first CEC message, wherein the first authentication command comprises a first authentication identification code.

In an embodiment of the present application, sending a multimedia signal to the display device based on the result of the first check includes: and if the result of the first verification indicates that the display equipment is authenticated successfully, sending the multimedia signal to the display equipment, so that the display equipment plays based on the multimedia signal.

In an embodiment of the present application, the device authentication method further includes: receiving a second CEC command from the display device, the second CEC command including a second authentication command; performing a second check on the second CEC command; and transmitting the multimedia signal to the display device further based on a result of the second check.

In an embodiment of the present application, performing the second check on the second CEC command includes: performing command matching on the second CEC command, and judging whether the second authentication command is included or not; if the second CEC command comprises the second authentication command, analyzing the second CEC command to obtain a second authentication identification code; and verifying the second authentication identification code.

In an embodiment of the present application, sending the multimedia signal to the display device further based on the result of the second check includes: if the result of the second verification indicates that the signal source equipment is authenticated successfully, sending an HDMI signal to the display equipment, so that the display equipment plays based on the HDMI signal; and stopping sending the HDMI signal or sending the error display picture signal if the result of the second check indicates that the signal source equipment is not authenticated successfully.

In an embodiment of the present application, the first authentication identification code or the second authentication identification code is preset by encoding outside a standard opcode; the first authentication identification code or the second authentication identification code comprises a source address and a destination address of a command; or the first authentication identification code or the second authentication identification code is hexadecimal code.

In a second aspect, a device authentication method is provided for use with a display device. The device authentication method comprises the following steps: receiving a first CEC command from a signal source device, the first CEC command including a first authentication command; performing a first check on the first CEC command; receiving a multimedia signal from the source device based on the result of the first verification; and playing based on the multimedia signal.

In an embodiment of the present application, performing the first check on the first CEC command includes: performing command matching on the first CEC command, and judging whether the first authentication command is included or not; if the first CEC command comprises the first authentication command, analyzing the first CEC command to obtain a first authentication identification code; and verifying the first authentication identification code.

In an embodiment of the present application, the device authentication method further includes: transmitting a second CEC command to the signal source device such that the signal source device performs a second check-up on the second CEC command, the second CEC command including a second authentication command, wherein transmitting the second CEC command to the signal source device includes: and sending the second authentication command to the signal source equipment through a second CEC message, wherein the second authentication command comprises a second authentication identification code.

In a third aspect, a device authentication method is provided, applied to a display device. The device authentication method comprises the following steps: transmitting a first CEC command to a signal source device, so that the signal source device performs a first check on the first CEC command, wherein the first CEC command comprises a first authentication command; receiving a multimedia signal from the source device based on the result of the first verification; and playing based on the multimedia signal.

In an embodiment of the present application, sending the first CEC command to the source device includes: and sending the first authentication command to the signal source equipment through a first CEC message, wherein the first authentication command comprises a first authentication identification code.

In an embodiment of the present application, receiving a multimedia signal from the signal source device based on the result of the first check includes: and if the result of the first check indicates that the signal source equipment is authenticated successfully, receiving the multimedia signal from the signal source equipment.

In an embodiment of the present application, the device authentication method further includes: receiving a second CEC command from the source device, the second CEC command including a second authentication command; performing a second check on the second CEC command; and receiving the multimedia signal from the signal source device further based on a result of the second check.

In an embodiment of the present application, receiving the multimedia signal from the signal source device further based on the result of the second check includes: if the result of the second verification indicates that the display equipment is authenticated successfully, receiving a high-definition multimedia interface (HDMI) signal from the signal source equipment; and stopping receiving the HDMI signal or playing the error display picture if the result of the second check indicates that the display equipment is not authenticated successfully.

In a fourth aspect, a device authentication method is provided, applied to a signal source device. The device authentication method comprises the following steps: receiving a first CEC command from a display device, the first CEC command including a first authentication command; performing a first check on the first CEC command; and transmitting a multimedia signal to the display device based on the result of the first check.

In an embodiment of the present application, the device authentication method further includes: transmitting a second CEC command to the display device such that the display device performs a second check on the second CEC command, the second CEC command including a second authentication command, wherein transmitting the second CEC command to the display device includes: and sending the second authentication command to the display device through a second CEC message, wherein the second authentication command comprises a second authentication identification code.

In a fifth aspect, a signal source device is provided. The signal source device includes: a memory configured to store a computer program, the computer program comprising program instructions; and a processor configured to execute the program instructions to cause the signal source device to perform the device authentication method described above.

In a sixth aspect, a display device is provided. The display device includes: a memory configured to store a computer program, the computer program comprising program instructions; and a processor configured to execute the program instructions to cause the display device to perform the device authentication method described above.

In a seventh aspect, a system on a chip is provided. The chip system includes a processor configured to call and run a processor executable program from a memory so that an electronic device mounted with the chip system performs the device authentication method described above.

According to the scheme, before the dialogue between the signal source equipment and the display equipment is carried out, the CEC instruction is subjected to advanced authentication operation, the CEC instruction has good compatibility and is not easy to maliciously bypass, and the connection between the signal source equipment and the display equipment is established through the CEC instruction, so that the technical effect of improving the safety of playing data streams by the equipment is achieved.

The foregoing summary is merely an overview of the present application, and is provided to enable one of ordinary skill in the art to make more clear the present application and to be practiced according to the teachings of the present application and to make more readily understood the above-described and other objects, features and advantages of the present application, as well as by reference to the following detailed description and accompanying drawings.

Drawings

The drawings are only for purposes of illustrating the principles, implementations, applications, features, and effects of the present application and are not to be construed as limiting the application.

FIG. 1 is a flow chart of a device authentication method according to an embodiment;

FIG. 2 is a flow chart of a second authentication ID verification process according to an embodiment;

FIG. 3 is a flow chart of a device authentication method for display device dominance according to an embodiment;

fig. 4 is a flowchart of a device authentication method for signal source device dominance according to an embodiment;

fig. 5 is a block diagram of an authentication system of an HDMI device according to an embodiment;

FIG. 6 is a flowchart of an authentication method of an HDTX device according to an embodiment;

Fig. 7 is a flowchart of an authentication method of an HDRX device according to an embodiment.

Detailed Description

In order to describe the technical content, constructional features, achieved objects and effects of the technical solution in detail, the following description is made in connection with the specific embodiments in conjunction with the accompanying drawings.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of the phrase "in various places in the specification are not necessarily all referring to the same embodiment, nor are they particularly limited to independence or relevance from other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in the embodiments may be combined in any manner to form a corresponding implementable technical solution.

Unless defined otherwise, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application pertains; the use of related terms herein is for the description of specific embodiments only and is not intended to limit the present application.

In the description of the present application, the term "and/or" is a representation for describing a logical relationship between objects, which means that there may be three relationships, e.g., a and/or B, representing: there are three cases, a, B, and both a and B. In addition, the character "/" herein generally indicates that the front-to-back associated object is an "or" logical relationship.

In this application, terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual number, order, or sequence of such entities or operations.

Without further limitation, the use of the terms "comprising," "including," "having," or other like terms in this application is intended to cover a non-exclusive inclusion, such that a process, method, or article of manufacture that comprises a list of elements does not include additional elements but may include other elements not expressly listed or inherent to such process, method, or article of manufacture.

As in the understanding of the "examination guideline," the expressions "greater than", "less than", "exceeding", and the like are understood to exclude the present number in this application; the expressions "above", "below", "within" and the like are understood to include this number. Furthermore, in the description of the embodiments of the present application, the meaning of "a plurality of" is two or more (including two), and similarly, the expression "a plurality of" is also to be understood as such, for example, "a plurality of groups", "a plurality of" and the like, unless specifically defined otherwise.

In the description of the embodiments of the present application, spatially relative terms such as "center," "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," etc., are used herein as terms of orientation or positional relationship based on the specific embodiments or figures, and are merely for convenience of description of the specific embodiments of the present application or ease of understanding of the reader, and do not indicate or imply that the devices or components referred to must have a particular position, a particular orientation, or be configured or operated in a particular orientation, and therefore are not to be construed as limiting of the embodiments of the present application.

Unless specifically stated or limited otherwise, in the description of the embodiments of the present application, the terms "mounted," "connected," "affixed," "disposed," and the like are to be construed broadly. For example, the "connection" may be a fixed connection, a detachable connection, or an integral arrangement; the device can be mechanically connected, electrically connected and communicated; it can be directly connected or indirectly connected through an intermediate medium; which may be a communication between two elements or an interaction between two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those skilled in the art to which the present application pertains according to the specific circumstances.

In some methods of the present application, the HDMI high definition multimedia interface (High Definition Multimedia Interface, HDMI) is a fully digital video and audio transmission interface that can transmit uncompressed audio and video signals. HDMI can be used for set top boxes, DVD players, personal computers, televisions, game consoles, combination expansion machines, digital audio and television sets, and other devices. HDMI can send audio frequency and video signal simultaneously, because audio frequency and video signal adopt same wire rod, simplify the installation degree of difficulty of system's circuit greatly.

HDCP is a High-bandwidth digital content protection technology (High-bandwidth Digital Content Protection, HDCP) developed by hollywood and semiconductor world giant Intel to ensure that digitized video and audio data are not illegally copied when transmitted through a transmission interface, and is suitable for a High-speed digital video interface (Displayport, HDMl, DVI) to realize protection by content scrambling. HDCP is designed as the last link in the content consumption chain, from the content source device to the display device, HDCP does not allow full content copy behavior, i.e. the copy control information CCl has only copy prohibited status. In terms of system updates, HDCP employs revocation lists to mask device private keys that have been stolen.

CEC (Consumer Electronics Control) provides advanced control functions between all different audio and video devices in the use environment, which can promote functions and interoperability of devices in the HDMI system, for example, support bidirectional communication between a video source (such as a DVD player) and a digital television, and realize functions of single key pressing and simultaneous power on. These features will enhance the user experience while eliminating much of the cumbersome manual handling and setup.

Fig. 1 is a flowchart illustrating a device authentication method according to an embodiment of the present disclosure. As shown in fig. 1, the device authentication method is applied to a signal source device, and includes the following steps S10 and S12.

In step S10, the signal source device transmits a first CEC command to the display device, so that the display device performs a first check on the first CEC command, and the first CEC command includes a first authentication command.

In step S12, the signal source device transmits a multimedia signal to the display device based on the result of the first check.

In this embodiment, the source device may be a device that outputs a display video data stream, also referred to herein as HDMITX. The display device may be a device that receives a video data stream, which may also be referred to herein as HDMIRX. In addition to the video data stream, CEC commands may be received and transmitted between the source device and the display device. After the signal source device and the display device are connected through the HDMI line, a first CEC command can be sent to carry out command matching, and whether the command is an authentication command or not can be judged by analyzing a packet header and the like only by means of well-defined coding rules. Otherwise, processing is performed according to a general CEC command. The first CEC command may include a first authentication command, the display device performs command matching after receiving the first CEC command, determines whether the command is an authentication command, if the command is an authentication command, analyzes the command in a preset manner, and performs a first check on an analysis result, where the result of the first check may include types such as analysis failure, analysis success and check success, and check failure. The sending of the multimedia signal to the display device based on the result of the first verification may be that the parsing is successful and the verification is successful. Other positive results may be used to send the multimedia signal to the display device, while negative results may not send the multimedia signal to the display device. The effect of sending the multimedia signal according to the verification result is achieved, and the safety of the playing equipment is improved.

In some embodiments, transmitting the first CEC command to the display device includes: the first authentication command is transmitted to the display device through the first CEC message, and the first authentication command includes the first authentication identification code. Specifically, the display device performs command matching after receiving the first CEC command, and determines whether it is an authentication command. If the command is an authentication command, then in step S14, the display device parses the first CEC command to obtain a first authentication identifier. Specifically, after judging the authentication command, the display device analyzes the first CEC command according to a preset rule to obtain a first authentication identification code. And checking the first authentication identification code, and if the check is successful, the signal source equipment sends a signal to the display equipment.

For example, a CEC command may be transmitted encoded in hexadecimal. The CEC command may include a source address, a destination address, command characters, and the like. The source address may be an address of the signal source device in the local area network and the destination address may be an address of the display device in the local area network. Only the signal source device and the display device are required to be well defined. HDMITX sends a command in hexadecimal, for example, as follows:

after the first authentication identification code is analyzed, the obtained characters can be checked with a preset password, if the check result accords with the preset password, the judgment is that the handshake is successful, the playing equipment sends the video data stream, and the display equipment displays the video data stream. Through the scheme, the CEC command mode can be utilized for low-cost verification, the authentication identification code can be transmitted through CEC, and compared with the technical scheme that the verification result can only be transmitted through CEC commands, the safety attribute of the scheme is enhanced.

In an embodiment of the present application, transmitting the multimedia signal to the display device based on the result of the first check includes: and if the result of the first verification indicates that the display equipment is authenticated successfully, transmitting a multimedia signal to the display equipment, so that the display equipment plays based on the multimedia signal. In a specific embodiment, please continue to refer to fig. 1, when the result of the first check indicates that the display device is authenticated, the display device displays the display signal of the signal source device in step S16. If the result is not positive, in step S18, the display device does not display the display signal of the signal source device. Through the arrangement, the response can be carried out from the display equipment according to the first verification result, only the first verification result can be displayed from the display equipment end when optimistic, and a set of judgment logic is carried out at the display equipment end, so that the safety of the scheme is further improved.

In some embodiments of the present application, reference may be made to fig. 2, and the following steps S20 and S22 are further performed if the verification is successful.

In step S20, the display device transmits a second CEC command to the signal source device.

In step S22, the signal source device receives a second CEC command from the display device, the second CEC command including a second authentication command; performing a second check on the second CEC command; and transmitting a multimedia signal to the display device further based on the result of the second verification.

The second CEC command can be matched after being received, and the judgment of whether the command is an authentication command can be realized by analyzing a packet header and the like only by defining a good coding rule. Otherwise, processing is performed according to a general CEC command. The second CEC command may include a second authentication command, the signal source device performs command matching after receiving the second CEC command, determines whether the command is an authentication command, if the command is an authentication command, analyzes the command in a preset manner, and then performs a second check on the analysis result, where the second check result may include types such as analysis failure, analysis success and check success, and check failure. The transmitting the multimedia signal to the display device based on the result of the second verification may be that the multimedia signal is transmitted to the display device only when the parsing is successful and the verification is successful. Other positive results may be used to send the multimedia signal to the display device, while negative results may not send the multimedia signal to the display device. Through the second checking step of the second CEC command, bidirectional identification checking can be performed between the display equipment and the signal source equipment, so that the safety of the scheme is further improved.

Next, in step S24, the signal source device parses the second CEC command, performs command matching on the second CEC command, and determines whether the second authentication command is included; if the second CEC command comprises a second authentication command, analyzing the second CEC command to obtain a second authentication identification code; and verifying the second authentication identification code.

In an embodiment of the present application, transmitting the multimedia signal to the display device based on the result of the second check includes: if the result of the second verification indicates that the signal source equipment is authenticated successfully, sending an HDMI signal to the display equipment, so that the display equipment plays based on the HDMI signal; and stopping transmitting the HDMI signal or transmitting the error display picture signal if the result of the second check indicates that the signal source device is not authenticated successfully. Specifically, referring to fig. 2, if the verification is successful, the signal source device continues to send the display signal to the display device in step S26. If it is not an authentication command, or other negative result, the signal source device stops sending the display signal or enters the error display interface in step S28. Through the scheme, the display device can stop sending the signal when the second verification result is unsuccessful, and the safety problem caused by replacement of the display device and the signal source device in the playing process can be prevented.

In this embodiment, the display device may also transmit a CEC command encoded in hexadecimal by using the CEC mechanism as follows. The CEC command may include a source address, a destination address, command characters, and the like. The source address may be an address of the display device in the local area network and the destination address may be an address of the signal source device in the local area network. Only the signal source device and the display device are required to be well defined. HDMITX sends a command in hexadecimal, for example, as follows:

After the second authentication identification code is analyzed, the obtained character can be checked with a preset password, if the check result accords with the preset password, the handshake is judged to be successful, and the display equipment can display the video data stream. By setting the display device to send the authentication command to the signal source device, the illegal plug-flow device can be prevented from pushing the video signal to the display device for display, and the safety of the application is further improved.

In some embodiments of the present application, the first authentication identification code is preset by encoding outside the standard opcode. For example, another codebook other than the standard opcode may be stored in both the signal source device and the display device, and when the command matching is performed to obtain an authentication command, the data is parsed by the another codebook. The problem of data analysis errors caused by disordered coding rules can be avoided through the arrangement.

In some embodiments of the present application, the first authentication identifier further includes a source address and a destination address of the command. The source address of the first authentication identification code is the source address of the signal source device which sends the first authentication identification code, and the destination address of the first authentication identification code is the address of the display device which receives the first authentication identification code; similarly, the source address of the second authentication identifier is the address of the display device that transmitted the second authentication identifier, and the destination address of the second authentication identifier is the address of the signal source device that received the second authentication identifier. By including address information in the CEC command, two devices in the network can be accurately positioned, and matching of the devices is facilitated.

In some embodiments of the present application, the authentication identification code is set to binary, octal, hexadecimal, and so on as required, and preferably, hexadecimal codes can be selected, so that the hexadecimal codes have more storage content, and can be conveniently set by user-defined codes. The encoding may also be done outside the standard opcode. The practicality of this scheme has been promoted.

In another aspect, in the embodiment shown in fig. 3, the application further shows a device authentication method applied to a display device. The device authentication method includes the following steps S30 and S32.

In step S30, the display device transmits a first CEC command to the signal source device, such that the signal source device performs a first check on the first CEC command, the first CEC command including a first authentication command.

In step S32, the display device receives a multimedia signal from the signal source device based on the result of the first check; and playing based on the multimedia signal.

The scheme of this embodiment is similar to the foregoing scheme, and the key point is that the sender of the first CEC command changes from the signal source device to the display device, the signal source device performs command matching after receiving the first CEC command, determines whether the command is an authentication command, if the command is an authentication command, parses the result in a preset manner, and performs a first check on the parsing result, where the result of the first check may include types such as parsing failure, parsing success and check success, and check failure. Receiving a multimedia signal based on a result of the first verification; and playing based on the multimedia signal may be that the multimedia signal is received only when the parsing is successful and the verification is successful. The multimedia signal may be received only when other positive results are present, while the multimedia signal of the source device is not received when negative results are present. The effect of receiving the multimedia signal according to the verification result is achieved, and the safety of the playing equipment is improved

In an embodiment of the present application, sending the first CEC command to the source device includes: and sending a first authentication command to the signal source device through the first CEC message, wherein the first authentication command comprises a first authentication identification code. Specifically, after receiving the first CEC command, the signal source device performs command matching, determines whether the command is an authentication command, and if the command is an authentication command, in step S34, the signal source device parses the first CEC command, and the signal source device parses the first CEC command according to a preset rule, so as to obtain a first authentication identification code. Checking the first authentication identification code, and if the check is successful, starting the display equipment to receive the signal. By setting the authentication identification code, the CEC command mode can be utilized to carry out low-cost verification, the authentication identification code can be transmitted through CEC, and compared with the technical scheme that the verification result can only be transmitted through CEC command, the safety attribute of the scheme is enhanced.

In an embodiment of the present application, receiving the multimedia signal from the signal source device based on the result of the first check includes: and if the result of the first check indicates that the signal source equipment is authenticated successfully, receiving the multimedia signal from the signal source equipment. With continued reference to fig. 3, when the result of the first check indicates that the signal source device is authenticated as a positive result, the display device receives the display signal of the signal source device in step S36. If the result is not positive, in step S38, the display device does not receive the display signal of the signal source device. Through the arrangement, the response can be carried out from the display device according to the first verification result, only the first verification result can be displayed from the display device end when optimistic, and a set of judgment logic is carried out at the signal source device end, so that the safety of the scheme is further improved.

In some embodiments corresponding thereto, the display device may further receive a second CEC command from the signal source device, the second CEC command including a second authentication command; performing a second check on the second CEC command; and receiving a multimedia signal from the source device further based on the result of the second check. The signal source equipment sends the second CEC command again to judge, so that the bidirectional handshake verification of the display equipment and the signal source equipment can be achieved, and the safety of the scheme is further improved.

In one embodiment of the present application, performing the second check on the second CEC command includes: performing command matching on the second CEC command, and judging whether the second CEC command comprises a second authentication command; if the second CEC command comprises a second authentication command, analyzing the second CEC command to obtain a second authentication identification code; and verifying the second authentication identification code. The specific setting mode of the authentication identification code can refer to other embodiments, and by setting the authentication identification code, the difficulty of decoding a CEC command can be increased, and the safety of the scheme is improved.

In an embodiment of the present application, receiving the multimedia signal from the signal source device further based on the result of the second check includes: if the result of the second check shows that the display equipment is authenticated successfully, receiving an HDMI signal from the signal source equipment; and stopping receiving the HDMI signal or playing the error display picture if the result of the second check indicates that the display device is not authenticated successfully. The above arrangement can promote the practicality of the scheme.

In an embodiment of the present application, the first authentication identification code or the second authentication identification code is preset by encoding outside a standard opcode; the first authentication identification code or the second authentication identification code comprises a source address and a destination address of the command; or the first authentication identification code or the second authentication identification code is hexadecimal code. The above arrangement can promote the practicality of the scheme.

As another embodiment shown in fig. 4, a device authentication method is applied to a signal source device, where the device authentication method includes the following steps S40 and S42.

In step S40, a first CEC command is received from the display device, the first CEC command including a first authentication command.

In step S42, a first check is performed on the first CEC command, and a multimedia signal is transmitted to the display device based on a result of the first check.

In this embodiment, the first CEC command is sent from the display device, and the specific function may refer to other embodiments. According to the embodiment, whether the first CEC command is transmitted to the display device or not during control is achieved through verification of the first CEC command, and safety of the scheme is improved.

In an embodiment of the present application, performing the first check on the first CEC command includes: performing command matching on the first CEC command, and judging whether the first CEC command comprises a first authentication command; if the first CEC command comprises a first authentication command, the first CEC command is analyzed to obtain a first authentication identification code; and verifying the first authentication identification code. By setting the authentication identification code, the CEC command mode can be utilized to carry out low-cost verification, the authentication identification code can be transmitted through CEC, and compared with the technical scheme that the verification result can only be transmitted through CEC command, the safety attribute of the scheme is enhanced.

In one embodiment of the present application, please continue to refer to fig. 4. The method further comprises the steps of: in step S44, a second CEC command is transmitted to the display device, such that the display device performs a second check on the second CEC command, the second CEC command including a second authentication command. The transmitting of the second CEC command to the display device includes: and sending a second authentication command to the display device through the second CEC message, wherein the second authentication command comprises a second authentication identification code. The signal source equipment sends the second CEC command again to judge, so that the bidirectional handshake verification of the display equipment and the signal source equipment can be achieved, and the safety of the scheme is further improved.

In the embodiment shown in fig. 5, there is also shown an authentication system of an HDMI device, which includes a signal source device 30 and a display device 31, the signal source device 30 being communicatively connected with the display device 31.

The system may be configured to perform the steps of: the signal source device 30 sends a first CEC command to the display device 31, the display device 31 performs command matching after receiving the first CEC command, determines whether the command is an authentication command, if the command is the authentication command, the display device 31 analyzes the first CEC command to obtain a first authentication identification code, checks the first authentication identification code, and if the check is successful, the display device 31 displays a display signal of the signal source device 30. If not, the display device 31 does not display the display signal of the signal source device 30. Through the system design, the CEC command mode can be utilized to carry out low-cost verification, the authentication identification code can be transmitted through CEC, and compared with the technical scheme that the verification result can only be transmitted through CEC commands, the safety attribute of the scheme is enhanced.

Further, if the verification is successful, the display device sends a second CEC command to the signal source device, the signal source device performs command matching after receiving the second CEC command, judges whether the command is an authentication command, if the command is the authentication command, the signal source device analyzes the second CEC command to obtain a second authentication identification code, verifies the second authentication identification code, if the verification is successful, the signal source device continues to send a display signal to the display device, and if the command is not the authentication command, the signal source device stops sending the display signal or enters an error display interface. By setting the display device to send the authentication command to the signal source device, the illegal plug-flow device can be prevented from pushing the video signal to the display device for display, and the safety of the application is further improved.

It will be appreciated that in some embodiments, the signal source device 30 and the display device 31 may be respectively configured to perform the device authentication method as described above, and will not be described herein. In some embodiments, signal source device 30 and display device 31 may each include a memory and a processor. The memory is configured to store a computer program comprising program instructions. The processor is configured to execute program instructions to cause the signal source device or the display device to perform the device authentication method as described above.

In other general embodiments, a system-on-chip is also described that includes a processor. The processor is configured to call and run a processor executable program from the memory to cause the electronic device on which the chip system is installed to perform the device authentication method described above. The electronic device herein may include a display device and a signal source device. The chip system can achieve the technical effect of improving the matching safety of the display equipment and the signal source equipment.

In other general embodiments, referring to FIG. 6, the method may include the steps of: the HDMITX sends a specific command to the HDMITX through CEC, the HDMITX normally displays after receiving the specific command, otherwise, the HDMITX displays an abnormal interface or does not display. HDMITX sends a command in hexadecimal, for example, as follows:

other commands may be defined, only requiring TX and RX to be predefined.

After the HDMIRX driver receives the CEC message, it first performs command matching, and if the command is the above command, the authentication status is set to be successful in authentication, so that the signal of HDMIRX can be displayed normally.

Because RX is a receiving end and is a passive party, if other information is sent, TX can only be sent to RX, there is no way to send RX to TX, CEC information can be sent in two directions, and two-way authentication is achieved.

In some other embodiments of the present application as shown in fig. 7, the scheme may further include the steps of: HDMIRX sends a command specific to HDMIRX through CEC, and after the HDMIRX receives the specific command, the HDMIRX outputs normally, otherwise, outputs an abnormal interface or does not output. HDMIRX sends a command in hexadecimal, for example, as follows:

other commands may be defined, only requiring TX and RX to be predefined.

After the HDMITX driver receives the CEC message, it first performs command matching, and if the command is the above command, the authentication status is set to be successful in authentication, so that the TMDS signal can be normally sent to the HDMITX. Because RX is a receiving end and is a passive party, if other information is sent, TX can only be sent to RX, there is no way to send RX to TX, CEC information can be sent in two directions, and two-way authentication is achieved.

It should be noted that, although the foregoing embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concepts of the present invention, alterations and modifications to the embodiments herein, or equivalent structures or equivalent flow transformations made by the present description and drawings, apply the above technical solution, directly or indirectly, to other relevant technical fields, all of which are included in the scope of the invention.

Claims

1. A device authentication method, applied to a signal source device, the device authentication method comprising:

transmitting a first CEC command to a display device, so that the display device performs a first check on the first CEC command, wherein the first CEC command comprises a first authentication command; and

and transmitting a multimedia signal to the display device based on the result of the first check.

2. The device authentication method of claim 1, wherein transmitting the first CEC command to the display device comprises: and sending the first authentication command to the display device through a first CEC message, wherein the first authentication command comprises a first authentication identification code.

3. The device authentication method of claim 1, wherein transmitting a multimedia signal to the display device based on the result of the first check comprises:

and if the result of the first verification indicates that the display equipment is authenticated successfully, sending the multimedia signal to the display equipment, so that the display equipment plays based on the multimedia signal.

4. The device authentication method of claim 1, further comprising:

receiving a second CEC command from the display device, the second CEC command including a second authentication command;

Performing a second check on the second CEC command; and

and transmitting the multimedia signal to the display device based further on the result of the second check.

5. The device authentication method of claim 4, wherein performing a second check on the second CEC command comprises:

performing command matching on the second CEC command, and judging whether the second authentication command is included or not;

if the second CEC command comprises the second authentication command, analyzing the second CEC command to obtain a second authentication identification code; and

and checking the second authentication identification code.

6. The device authentication method of claim 4, wherein transmitting the multimedia signal to the display device further based on the result of the second check comprises:

if the result of the second verification indicates that the signal source equipment is authenticated successfully, sending an HDMI signal to the display equipment, so that the display equipment plays based on the HDMI signal; and

and if the result of the second check indicates that the signal source equipment is not authenticated successfully, stopping sending the HDMI signal or sending an error display picture signal.

7. The device authentication method according to claim 2 or 5, wherein the first authentication identification code or the second authentication identification code is preset by encoding outside a standard opcode;

the first authentication identification code or the second authentication identification code comprises a source address and a destination address of a command; or alternatively

The first authentication identification code or the second authentication identification code is hexadecimal code.

8. A device authentication method, applied to a display device, the device authentication method comprising:

receiving a first CEC command from a signal source device, the first CEC command including a first authentication command;

performing a first check on the first CEC command;

receiving a multimedia signal from the source device based on the result of the first verification; and

and playing based on the multimedia signal.

9. The device authentication method of claim 8, wherein the first checking the first CEC command comprises:

performing command matching on the first CEC command, and judging whether the first authentication command is included or not;

if the first CEC command comprises the first authentication command, analyzing the first CEC command to obtain a first authentication identification code; and

And checking the first authentication identification code.

10. The device authentication method of claim 8, further comprising:

transmitting a second CEC command to the signal source device such that the signal source device performs a second check-up of the second CEC command, the second CEC command including a second authentication command,

wherein transmitting a second CEC command to the source device includes: and sending the second authentication command to the signal source equipment through a second CEC message, wherein the second authentication command comprises a second authentication identification code.

11. A device authentication method, applied to a display device, the device authentication method comprising:

transmitting a first CEC command to a signal source device, so that the signal source device performs a first check on the first CEC command, wherein the first CEC command comprises a first authentication command;

and playing based on the multimedia signal.

12. The device authentication method of claim 11, wherein transmitting the first CEC command to the source device comprises: and sending the first authentication command to the signal source equipment through a first CEC message, wherein the first authentication command comprises a first authentication identification code.

13. The device authentication method of claim 11, wherein receiving a multimedia signal from the signal source device based on the result of the first check comprises:

and if the result of the first check indicates that the signal source equipment is authenticated successfully, receiving the multimedia signal from the signal source equipment.

14. The device authentication method of claim 11, further comprising:

receiving a second CEC command from the source device, the second CEC command including a second authentication command;

performing a second check on the second CEC command; and

the multimedia signal is received from the signal source device further based on a result of the second check.

15. The device authentication method of claim 14, wherein performing a second check on the second CEC command comprises:

and checking the second authentication identification code.

16. The device authentication method of claim 14, wherein receiving the multimedia signal from the signal source device further based on the result of the second check comprises:

If the result of the second verification indicates that the display equipment is authenticated successfully, receiving a high-definition multimedia interface (HDMI) signal from the signal source equipment; and

and if the result of the second check indicates that the display equipment is not authenticated successfully, stopping receiving the HDMI signal or playing the error display picture.

17. The device authentication method according to claim 12 or 15, characterized in that the first authentication identification code or the second authentication identification code is preset by encoding outside a standard opcode;

18. A device authentication method, applied to a signal source device, the device authentication method comprising:

receiving a first CEC command from a display device, the first CEC command including a first authentication command;

performing a first check on the first CEC command; and

19. The device authentication method of claim 18, wherein the first checking the first CEC command comprises:

and checking the first authentication identification code.

20. The device authentication method of claim 18, further comprising:

transmitting a second CEC command to the display device such that the display device performs a second check on the second CEC command, the second CEC command including a second authentication command,

wherein transmitting the second CEC command to the display device includes: and sending the second authentication command to the display device through a second CEC message, wherein the second authentication command comprises a second authentication identification code.

21. A signal source device, comprising:

a memory configured to store a computer program, the computer program comprising program instructions; and

a processor configured to execute the program instructions to cause the signal source device to perform the device authentication method according to any one of claims 1 to 7, 18 to 20.

22. A display device, characterized by comprising:

a processor configured to execute the program instructions to cause the display device to perform the device authentication method according to any one of claims 8 to 17.

23. A chip system comprising a processor configured to invoke and run a processor executable program from a memory, such that an electronic device on which the chip system is installed performs the device authentication method according to any of claims 1 to 7, 18 to 20 or the device authentication method according to any of claims 8 to 17.