CN110794971A - Remote control equipment and system - Google Patents
Remote control equipment and system Download PDFInfo
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- CN110794971A CN110794971A CN201811651403.7A CN201811651403A CN110794971A CN 110794971 A CN110794971 A CN 110794971A CN 201811651403 A CN201811651403 A CN 201811651403A CN 110794971 A CN110794971 A CN 110794971A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03543—Mice or pucks
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/0202—Constructional details or processes of manufacture of the input device
- G06F3/0219—Special purpose keyboards
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
- G06F3/0383—Signal control means within the pointing device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Input From Keyboards Or The Like (AREA)
Abstract
The embodiment of the invention provides remote control equipment and a remote control system, which are used for meeting the requirement of remote operation in emergency treatment. The equipment comprises a keyboard and mouse simulator, a video signal collector and a transfer host; the keyboard and mouse simulator is used for converting keyboard and mouse signals received from the transfer host into serial signals, decoding the serial signals, converting the serial signals into keyboard control signals and mouse control signals and sending the keyboard control signals and the mouse control signals to the target host; the video signal collector is used for collecting signals displayed by the target host and sending the collected signals to the back-end host through the transfer host; the transfer host is used for receiving keyboard and mouse signals sent by emergency treatment personnel on the back-end host and sending the keyboard and mouse signals to the keyboard and mouse simulator; the video signal acquisition device is used for acquiring a video signal and transmitting the video signal to the back-end host; the keyboard and mouse simulator, the video signal collector and the transfer host are positioned on the site where the network security event occurs.
Description
Technical Field
The invention relates to the technical field of network security, in particular to remote control equipment and a remote control system.
Background
At present, network security events are frequent and distributed all over the country, experienced emergency response personnel are seriously insufficient, and the network security events are difficult to be disposed when arriving at the site at the first time of occurrence of the network security events.
When a network security incident occurs, emergency response personnel usually cannot perform remote emergency treatment by directly accessing the network where the network security incident occurs due to network breakdown in the field or to avoid infecting other equipment through the network by problematic equipment.
In summary, after a network security event occurs, it is difficult for emergency response personnel to perform remote emergency treatment through the network.
Disclosure of Invention
The embodiment of the invention provides remote control equipment and a remote control system, which are used for meeting the requirement of remote operation in emergency treatment.
Based on the above problems, the remote control device provided in the embodiment of the present invention includes a keyboard and mouse simulator, a video signal collector, and a transfer host;
the keyboard and mouse simulator is used for converting keyboard and mouse signals received from the transfer host into serial signals, decoding the serial signals and converting the serial signals into keyboard control signals and mouse control signals, and sending the keyboard control signals and the mouse control signals to the target host; the keyboard and mouse signals received by the transfer host are keyboard and mouse signals sent by emergency treatment personnel on the back-end host;
the video signal collector is used for collecting the signals displayed by the target host and sending the collected signals to the back-end host through the transfer host;
the transfer host is used for receiving keyboard and mouse signals sent by emergency treatment personnel on the back-end host and sending the keyboard and mouse signals to the keyboard and mouse simulator; the video signal collector is used for collecting video signals and sending the video signals to the back-end host;
the keyboard and mouse simulator, the video signal collector and the transfer host are positioned on the site where the network security event occurs.
The remote control system provided by the embodiment of the invention comprises a transfer server, a back-end host and the remote control equipment provided by the embodiment of the invention.
The embodiment of the invention has the beneficial effects that:
the embodiment of the invention provides remote control equipment and a remote control system, wherein a keyboard and mouse simulator converts a keyboard and mouse signal received from a transfer host into a serial signal, decodes the serial signal into a keyboard control signal and a mouse control signal, and sends the keyboard control signal and the mouse control signal to a target host; the keyboard and mouse signals received by the transfer host are keyboard and mouse signals sent by emergency treatment personnel on the back-end host; the video signal collector collects the signals displayed by the target host and sends the collected signals to the back-end host through the transfer host; the transfer host receives keyboard and mouse signals sent by emergency treatment personnel on the back-end host and sends the keyboard and mouse signals to the keyboard and mouse simulator; receiving the signals collected by the video signal collector and sending the signals to the back-end host; the keyboard and mouse simulator, the video signal collector and the transfer host avoid the direct connection of the rear-end host with the target host through a network, reduce the infected risk, and simultaneously enable emergency response personnel to remotely perform safe emergency treatment.
Drawings
Fig. 1 is a schematic structural diagram of a remote control device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another remote control device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another remote control device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another remote control device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another remote control device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a keyboard and mouse simulator provided in an embodiment of the present invention in an actual application scenario;
fig. 7 is a schematic structural diagram of a keyboard and mouse simulator provided in an embodiment of the present invention in another practical application scenario.
Detailed Description
According to the remote control device and the remote control system, the keyboard and mouse simulator, the video signal collector and the transfer host avoid the situation that a rear-end host is directly connected with a target host through a network, so that the risk of infection is reduced, and meanwhile, emergency response personnel can remotely perform safe emergency treatment.
The following describes specific embodiments of a remote control device and a remote control system according to embodiments of the present invention with reference to the accompanying drawings.
The remote control device provided by the embodiment of the invention, as shown in fig. 1, includes a keyboard and mouse simulator 11, a video signal collector 12 and a relay host 13;
the keyboard and mouse simulator 11 is used for converting keyboard and mouse signals received from the relay host 13 into serial signals, decoding and converting the serial signals into keyboard control signals and mouse control signals, and sending the keyboard control signals and the mouse control signals to the target host 14; the keyboard and mouse signals received by the relay host 13 are keyboard and mouse signals sent by emergency treatment personnel on the back-end host 15;
the video signal collector 12 collects signals of the target host 14 and sends the collected signals to the back-end host 15 through the relay host 13;
the relay host 13 is used for receiving keyboard and mouse signals sent by emergency treatment personnel on the back-end host 15 and sending the keyboard and mouse signals to the keyboard and mouse simulator 11; and is used for receiving the signal collected by video signal collector 12 and sending it to back end host computer 15;
wherein, the keyboard and mouse simulator 11, the video signal collector 12 and the relay host 13 are located at the site where the network security event occurs.
Further, as shown in fig. 2, the relay host 13 and the backend host 15 encrypt and forward signals through the relay server 21, where the encrypted and forwarded signals include keyboard and mouse signals and signals collected by the video signal collector.
Before encrypting and forwarding the signal, the relay server needs to determine that the key of the connection initiated by the relay host to the relay server is the same as the key of the connection initiated by the backend host to the relay server.
The key can be dynamically generated by the back-end host, and the staff at the transfer host side is informed through other communication modes, such as telephone, and after the transfer host and the back-end host initiate connection to the transfer server at the same time, the staff inputs the acquired key and then the same connection of the key is established.
In practical application, the video signal collector can convert the collected video signal into Real Time Streaming Protocol (RSTP) rtsp Streaming service, and send the rtsp Streaming service to the relay host through a 554 port; the keyboard and mouse simulator can be connected with the relay host through an RS232 interface, and a network protocol data packet carrying a keyboard and mouse signal can be converted into an RS232 protocol data packet during relay and sent to the keyboard and mouse simulator.
The relay host, the relay server and the back-end server can adopt a tunnel communication mode to transmit data packets, including data packets of the RSTP streaming service and data packets of keyboard and mouse signals. For example, in practical application, the backend host may notify the transit server to monitor 127.0.0.1:28880 and 127.0.0.1:554 at the same time, encrypt the data packet of the keyboard and mouse signal and forward the encrypted data packet to the transit host through the transit server; the transfer host receives and encrypts a data packet of the RSTP streaming service, and then returns the data packet to the transfer server in real time; the transit server only forwards the data packet and does not decrypt the data packet.
Before the data packet is transmitted among the relay host, the relay server and the back-end server in a tunnel communication mode, the server can simultaneously forward a plurality of tunnel data, and different communications can complete data transmission in different encryption tunnels so as to enable the data transmission not to be interfered with each other due to the consideration of safety. And in the connection process, when the two ends initiating connection are the same ID and the passwords are consistent, the tunnels can be connected, the data packet can be forwarded, otherwise, the connection is refused. After the connection is successfully established, in order to ensure the communication security, the data packet may be AES256 encrypted during the tunnel packet forwarding process.
Optionally, as shown in fig. 3, the keyboard and mouse simulator provided in the embodiment of the present invention includes a first signal plug 31, a first conversion circuit 32, a keyboard and mouse signal simulation circuit 33, and a second signal plug 34;
a first conversion circuit 32, configured to convert a keyboard and mouse signal received from the relay host 13 through the first signal plug 31 into a serial signal;
the keyboard and mouse signal analog circuit 33 is used for receiving the serial signals through a signal receiving end of the keyboard and mouse signal analog circuit, decoding and converting the serial signals into keyboard control signals and mouse control signals, and sending the keyboard control signals and the mouse control signals to the target host 14 through a second signal plug 34; the signal transmitting end of the keyboard and mouse signal analog circuit 33 is suspended;
wherein the target host 14 and the transit host 13 are located at the site where the network security event occurs.
In the keyboard and mouse simulator provided by the embodiment of the invention, after the first conversion circuit converts the keyboard and mouse signals received from the relay host through the first signal plug into serial signals, the keyboard and mouse signal simulation circuit is suspended because of a signal transmitting end, that is, a device (namely, the relay host) generating a security event cannot send any signal to the relay host and the rear-end host through the keyboard and mouse signal simulation circuit, the first conversion circuit and the first signal plug, so that the device generating the security event is prevented from infecting other devices through a network; in addition, the keyboard and mouse signal simulation circuit receives serial signals only through the signal receiving end, decodes and converts the serial signals into keyboard control signals and mouse control signals, and sends the keyboard control signals and the mouse control signals to the target host through the second signal plug, so that the equipment (namely the target host) with the safety events can receive the keyboard and mouse signals sent by the back-end host through the network, the relay host, the first signal plug, the first conversion circuit, the keyboard and mouse signal simulation circuit and the second signal plug, and therefore emergency response personnel can be guaranteed to be connected into the network to carry out remote emergency handling on the safety events on the premise of avoiding the equipment from being infected.
The keyboard and mouse signal analog circuit can be realized by a Micro Control Unit (MCU), and decodes the received serial signal by programming a specific firmware, and converts the serial signal into a corresponding keyboard control signal and a corresponding mouse control signal.
The first signal plug and the second signal plug may be Universal Serial Bus (Universal Serial Bus) interfaces; the first signal plug may also be a parallel interface, or other various types of network interfaces, wireless or bluetooth interfaces, and the like, and accordingly, a portion of the first conversion circuit that performs signal transmission with the first signal plug also needs to be adjusted correspondingly according to the type of the interface; the second signal plug can also be a PS2 interface, and certainly, since it needs to transmit both keyboard control signals and mouse control signals, the second signal plug can be two PS2 interfaces; of course, the second signal plug may also be other interfaces capable of transmitting keyboard control signals and mouse control signals.
Further, in order to avoid the reverse transmission of the interference signal, that is, to avoid the interference signal from being transmitted from the target host side to the relay host side, as shown in fig. 4, the keyboard and mouse simulator provided in the embodiment of the present invention further includes an isolation circuit 41;
and the isolation circuit 41 is configured to receive the serial signal from the first converting circuit 32 and send the received serial signal to the keyboard and mouse signal simulating circuit 33 in a coupled manner, so as to prevent the interference signal on the target host side from being reversely transmitted to the relay host 13.
In practical implementation, the isolation circuit 41 may be an electromagnetic isolation circuit, an optical coupling isolation circuit, or another type of isolation circuit.
When the isolation circuit is an optical coupling isolation circuit, the input end of the optical coupling isolation circuit receives serial signals from the first conversion circuit, and the output end of the optical coupling isolation circuit is connected with the signal receiving end of the keyboard and mouse signal analog circuit; the optical coupling isolation circuit can ensure that the two isolated parts of the circuit are not directly electrically connected.
When the isolation circuit is an electromagnetic isolation circuit, the input end of the electromagnetic isolation circuit receives serial signals from the first conversion circuit, and the output end of the electromagnetic isolation circuit is connected with the signal receiving end of the keyboard and mouse signal analog circuit; wherein the ground signal at the input side of the electromagnetic isolation circuit is different from the ground signal at the output side of the electromagnetic isolation circuit. The input side and the output side of the electromagnetic isolation circuit are in different power supply loops and supply power independently, so that signal isolation can be realized on a physical layer, signals can be transmitted only in one direction, and various interference signals cannot be transmitted reversely through ground signals, so that the data safety is ensured fundamentally, and the possibility of data leakage of a target host is avoided.
Further, the keyboard and mouse simulator provided by the embodiment of the present invention, as shown in fig. 5, further includes a log recording circuit 51;
and the log recording circuit 51 is used for recording the keyboard control signal output by the keyboard and mouse signal analog circuit.
That is, the keyboard and mouse signal simulation circuit analyzes the serial signal, recognizes the keyboard control signal and the mouse control signal, and transmits only the keyboard control signal to the log recording circuit, so that only the keyboard control signal is stored.
When the working levels of the keyboard and mouse signal analog circuit and the log recording circuit are not consistent, the log recording circuit comprises a level conversion circuit, a secure digital card reader and a secure digital card; the level conversion circuit provides proper working level for the secure digital card reader, and the secure digital card reader writes the received keyboard control signal into the secure digital card.
In a specific application scenario, the first signal plug and the second signal plug are both USB plugs, the first conversion circuit is a USB serial conversion circuit, and the isolation circuit is an electromagnetic isolation circuit, and the keyboard and mouse simulator provided by the embodiment of the present invention may be as shown in fig. 6.
In fig. 6, the USB plug connected to the USB serial conversion circuit is a first signal plug, the USB serial conversion circuit converts the keyboard and mouse signals received through the USB plug into serial signals, and transmits the serial signals to the electromagnetic isolation circuit through its own signal output TXD pin, the electromagnetic isolation circuit transmits the signals to the signal receiving end D0/RX of the keyboard and mouse signal analog circuit through electromagnetic coupling, the signal transmitting end D1/TX of the keyboard and mouse signal analog circuit is suspended, the keyboard and mouse signal analog circuit converts the received signals into keyboard control signals and mouse control signals, and transmits the keyboard control signals and mouse control signals to the target host through a second signal plug, that is, another USB plug.
In fig. 6, the ground signal on the input side of the electromagnetic isolation circuit is identical to the ground signal of the USB serial conversion circuit and is uarttgnd, and the ground signal on the output side of the electromagnetic isolation circuit is identical to the ground signal of the keyboard and mouse signal analog circuit and is GND, so that the input side ground signal and the output side ground signal of the electromagnetic isolation circuit are isolated.
In another specific application scenario, the first signal plug and the second signal plug are both USB plugs, the first conversion circuit is a USB serial conversion circuit, and the isolation circuit is an optical coupling isolation circuit, and the keyboard and mouse simulator provided by the embodiment of the present invention may be as shown in fig. 7.
In fig. 7, the USB plug connected to the USB serial conversion circuit is a first signal plug, the USB serial conversion circuit converts the keyboard and mouse signals received through the USB plug into serial signals, and transmits the serial signals to the optical coupler isolation circuit through its own signal output TXD pin, the optical coupler isolation circuit transmits the signals to the signal receiving end D0/RX of the keyboard and mouse signal analog circuit through photoelectric coupling, the signal transmitting end D1/TX of the keyboard and mouse signal analog circuit is suspended, the keyboard and mouse signal analog circuit converts the received signals into keyboard control signals and mouse control signals, and transmits the keyboard control signals and mouse control signals to the target host through a second signal plug, that is, another USB plug transmits the signals to the target host.
In the circuits shown in fig. 6 and 7, a logging circuit may be connected to the SCK pin (clock signal pin), MOSI pin (serial data input pin), and MISO pin (serial data output pin) of the keyboard and mouse signal simulation circuit, thereby recording the keyboard control signal.
In addition, in the circuits shown in fig. 6 and 7, the chip used in the keyboard and mouse signal simulation circuit supports serial bidirectional communication, but in order to transmit the keyboard and mouse signals in one direction, the transmission line in the serial communication line is suspended, that is, the signal transmitting terminal in the keyboard and mouse signal simulation circuit is suspended.
The remote control system provided by the embodiment of the invention comprises a transfer server, a back-end host and the remote control equipment provided by the embodiment of the invention.
Through the above description of the embodiments, those skilled in the art will clearly understand that the embodiments of the present invention can be implemented by means of hardware and necessary software. Based on such understanding, the technical solutions of the embodiments of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods according to the embodiments of the present invention.
Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred embodiment and that the blocks or flow diagrams in the drawings are not necessarily required to practice the present invention.
Those skilled in the art will appreciate that the modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, and may be correspondingly changed in one or more devices different from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A remote control device is characterized by comprising a keyboard and mouse simulator, a video signal collector and a transfer host;
the keyboard and mouse simulator is used for converting keyboard and mouse signals received from the transfer host into serial signals, decoding the serial signals and converting the serial signals into keyboard control signals and mouse control signals, and sending the keyboard control signals and the mouse control signals to the target host; the keyboard and mouse signals received by the transfer host are keyboard and mouse signals sent by emergency treatment personnel on the back-end host;
the video signal collector is used for collecting the signals displayed by the target host and sending the collected signals to the back-end host through the transfer host;
the transfer host is used for receiving keyboard and mouse signals sent by emergency treatment personnel on the back-end host and sending the keyboard and mouse signals to the keyboard and mouse simulator; the video signal collector is used for collecting video signals and sending the video signals to the back-end host;
the keyboard and mouse simulator, the video signal collector and the transfer host are positioned on the site where the network security event occurs.
2. The device of claim 1, wherein the relay host and the backend host encrypt and forward signals through a relay server, wherein the encrypted and forwarded signals include keyboard and mouse signals and signals collected by a video signal collector.
3. The apparatus of claim 2, wherein the transit server is further configured to determine that a key of the transit host for the transit server-initiated connection is the same as a key of the back-end host for the transit server-initiated connection prior to performing the encrypting and forwarding of the signal.
4. The device of claim 1, wherein the keyboard-mouse emulator includes a first signal plug, a first conversion circuit, a keyboard-mouse signal emulation circuit, a second signal plug;
the first conversion circuit is used for converting keyboard and mouse signals received from the transfer host machine through the first signal plug into serial signals;
the keyboard and mouse signal analog circuit is used for receiving serial signals through a signal receiving end of the keyboard and mouse signal analog circuit, decoding and converting the serial signals into keyboard control signals and mouse control signals, and sending the keyboard control signals and the mouse control signals to a target host through the second signal plug; and the signal transmitting end of the keyboard and mouse signal analog circuit is suspended.
5. The device of claim 4, wherein the keyboard-mouse emulator further comprises an isolation circuit;
the isolation circuit is used for receiving serial signals from the first conversion circuit and sending the received serial signals to the keyboard and mouse signal simulation circuit in a coupling mode so as to prevent interference signals on the target host computer side from being reversely transmitted to the transfer host computer.
6. The device of claim 5, wherein the isolation circuit is an electromagnetic isolation circuit, an input terminal of the electromagnetic isolation circuit receives serial signals from the first conversion circuit, and an output terminal of the electromagnetic isolation circuit is connected to a signal receiving terminal of the keyboard and mouse signal simulation circuit; wherein a ground signal on an input side of the electromagnetic isolation circuit is different from a ground signal on an output side of the electromagnetic isolation circuit.
7. The device of claim 5, wherein the isolation circuit is an optical coupling isolation circuit, an input end of the optical coupling isolation circuit receives serial signals from the first conversion circuit, and an output end of the optical coupling isolation circuit is connected with a signal receiving end of the keyboard and mouse signal analog circuit.
8. The device of claim 4, wherein the keyboard-mouse simulator further comprises a logging circuit;
and the log recording circuit is used for recording the keyboard control signal output by the keyboard and mouse signal simulation circuit.
9. The device of claim 8, wherein the logging circuit comprises a level conversion circuit, a secure digital card reader, and a secure digital card.
10. A remote control system comprising a transit server, a backend host, and the remote control apparatus of any one of claims 1 to 9.
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| CN201811651403.7A CN110794971B (en) | 2018-12-31 | 2018-12-31 | Remote control equipment and system |
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| CN201811651403.7A CN110794971B (en) | 2018-12-31 | 2018-12-31 | Remote control equipment and system |
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| CN111475867A (en) * | 2020-04-03 | 2020-07-31 | 刘小明 | General safety cooperation system |
| CN112462961A (en) * | 2020-12-04 | 2021-03-09 | 深圳市创维群欣安防科技股份有限公司 | Network forwarding keyboard mouse code processing method, device and system |
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| CN111475867A (en) * | 2020-04-03 | 2020-07-31 | 刘小明 | General safety cooperation system |
| CN112462961A (en) * | 2020-12-04 | 2021-03-09 | 深圳市创维群欣安防科技股份有限公司 | Network forwarding keyboard mouse code processing method, device and system |
| CN113190489A (en) * | 2021-05-19 | 2021-07-30 | 郑州信大捷安信息技术股份有限公司 | Double-host event sharing switching device and method |
| CN113190489B (en) * | 2021-05-19 | 2022-04-08 | 郑州信大捷安信息技术股份有限公司 | Double-host event sharing switching device and method |
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