CN110971613A - Audio and video signal light unidirectional transmission device and method - Google Patents
Audio and video signal light unidirectional transmission device and method Download PDFInfo
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- CN110971613A CN110971613A CN201911292920.4A CN201911292920A CN110971613A CN 110971613 A CN110971613 A CN 110971613A CN 201911292920 A CN201911292920 A CN 201911292920A CN 110971613 A CN110971613 A CN 110971613A
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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
- H04L63/18—Network architectures or network communication protocols for network security using different networks or channels, e.g. using out of band channels
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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
- H04L63/20—Network architectures or network communication protocols for network security for managing network security; network security policies in general
Abstract
The invention provides a unidirectional transmission device and a unidirectional transmission method for audio and video signal light, wherein the signal input end of the unidirectional transmission device for audio and video signal light is connected with host equipment through a cable; the signal output end of the audio/video signal light unidirectional transmission device is connected with the display equipment through a cable; the audio and video signal optical unidirectional transmission device comprises a first protocol conversion unit, a data coding unit, a physical optical unidirectional unit, a data decoding unit and a second protocol conversion unit which are sequentially connected in series from a signal input end to a signal output end. According to the invention, the data unidirectional physical channel from the host equipment to the display equipment is established, so that the data unidirectional transmission from the host equipment to the display equipment is realized, the unidirectional data physical channel from the display equipment to the host equipment is cut off, further, the display equipment can not actively attack the host equipment through the traditional bidirectional physical link, and the data protection and effective protection on the host equipment are increased.
Description
Technical Field
The invention belongs to the technical field of information security, and particularly relates to an audio and video signal optical unidirectional transmission device and method.
Background
At present, computers in the market all include a host device and a display device, and with the development of networks, users have higher and higher requirements for the use security of personal computers, so that users usually add more protection measures for the host device, thereby preventing data stored by the host device from being leaked.
However, the inventor finds that the prior art has at least the following problems in the process of implementing the invention:
the host device and the display device are connected through interfaces such as DVI, VGA, HDMI and the like, and the connecting line of the interfaces is usually made of a cable material. Because the cable material is part of a bi-directional communication link, the display device may actively attack the host device through the cable, thereby causing leakage of data stored by the host device.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an audio and video signal optical unidirectional transmission device and method, which can effectively solve the problems.
The technical scheme adopted by the invention is as follows:
the invention provides an audio and video signal optical unidirectional transmission device, wherein a signal input end of the audio and video signal optical unidirectional transmission device is connected with host equipment through a cable; the signal output end of the audio/video signal light unidirectional transmission device is connected with the display equipment through a cable; the audio and video signal optical unidirectional transmission device comprises a first protocol conversion unit, a data coding unit, a physical optical unidirectional unit, a data decoding unit and a second protocol conversion unit which are sequentially connected in series from a signal input end to a signal output end; wherein the physical light unidirectional unit includes a light emitting member, a light emitting member driving circuit, a photosensitive member, and a photosensitive member driving circuit; the light emitting member and the photosensitive member are oppositely disposed; the input end of the light-emitting part driving circuit is connected with the data encoding unit, and the output end of the light-emitting part driving circuit is connected with the light-emitting part; the input end of the photosensitive member driving circuit is connected with the photosensitive member, and the output end of the photosensitive member driving circuit is connected with the data decoding unit.
Preferably, the data coding unit is internally provided with hardware H.264 and H.265 coding modules.
The invention also provides a transmission method of the audio and video signal optical unidirectional transmission device, the audio and video signal optical unidirectional transmission device is a unidirectional physical channel, and the host equipment sends audio and video data to the display equipment through the audio and video signal optical unidirectional transmission device; the display equipment is forbidden to send audio and video data to the host equipment through the audio and video signal optical unidirectional transmission device;
the audio and video signal optical unidirectional transmission device is a unidirectional physical channel, and the host equipment sends audio and video data to the display equipment through the audio and video signal optical unidirectional transmission device, and the method specifically comprises the following steps:
step 1, the host equipment sends audio data and video data to a first protocol conversion unit through a cable;
step 2, the first protocol conversion unit carries out protocol transcoding on the received audio data and video data to form audio and video mixed data stream;
step 3, the first protocol conversion unit sends the obtained audio and video mixed data stream to a data coding unit;
step 4, the data coding unit analyzes the received audio and video mixed data stream according to the audio and video protocol to obtain the analyzed audio and video mixed data stream; then, carrying out redundancy check on the analyzed audio and video mixed data stream, and removing redundant information to obtain the audio and video mixed data stream after redundancy removal; packaging the audio and video mixed data stream after redundancy removal to form transmittable audio and video coded data;
step 5, the data coding unit sends the audio and video coding data obtained in the step 4 to a physical optical unidirectional unit;
step 6, the physical optical unidirectional unit performs unidirectional transmission on the audio and video coded data, and the unidirectional transmission specifically comprises the following steps:
step 6.1, the light-emitting part driving circuit receives audio and video coding data from the data coding unit; the light emitting component driving circuit controls the light emitting component to emit light signals with coding characteristics through a physical differential signal link according to the coding characteristics of the audio and video coding data;
step 6.2, the photosensitive component senses the optical signal with the coding characteristic sent by the light-emitting component, and then the photosensitive component converts the optical signal with the coding characteristic into an electrical signal with the coding characteristic;
step 6.3, the photosensitive component sends the electrical signal with the coding characteristic to the photosensitive component driving circuit through the physical differential signal link;
step 6.4, the photosensitive component driving circuit performs signal processing on the received electric signal with the coding characteristic to obtain a transmittable audio/video coding electric signal, and transmits the transmittable audio/video coding electric signal to the data decoding unit;
step 7, the data decoding unit decapsulates the received transmittable audio/video coded electrical signal according to H.264 and H.265 coding and decoding algorithms, restores the decapsulated audio/video electrical signal into an audio/video mixed data stream according to the audio/video coding algorithm, and transmits the audio/video mixed data stream to the second protocol conversion unit;
step 8, the second protocol conversion unit carries out protocol conversion on the received audio and video mixed data stream to separate out audio data and video data; then, the separated audio data and video data are transmitted to the display apparatus.
The audio and video signal light unidirectional transmission device and the method provided by the invention have the following advantages:
according to the invention, the data unidirectional physical channel from the host equipment to the display equipment is established, so that the data unidirectional transmission from the host equipment to the display equipment is realized, the unidirectional data physical channel from the display equipment to the host equipment is cut off, further, the display equipment can not actively attack the host equipment through the traditional bidirectional physical link, and the data protection and effective protection on the host equipment are increased.
Drawings
Fig. 1 is a connection relationship diagram of an audio/video signal optical unidirectional transmission apparatus, a host device and a display device provided by the present invention;
fig. 2 is a schematic diagram of a principle of the audio/video signal optical unidirectional transmission device provided by the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Because the personal computer protection usually only protects the host equipment, the harmfulness of the display equipment is ignored, and because the host equipment and the display equipment adopt bidirectional cable communication for communication, the host equipment is attacked by the display equipment and the data leakage risk of the host equipment is increased, so that the confidential data stored by the host equipment cannot be effectively protected. Based on the above, the invention provides an audio and video signal optical unidirectional transmission device and method, which are used for preventing display equipment from actively attacking host equipment and improving the use safety of the host equipment.
Specifically, the invention realizes the unidirectional data transmission from the host device to the display device by building the unidirectional data physical channel from the host device to the display device, and cuts off the unidirectional data physical channel from the display device to the host device, namely: the audio and video signals of the host equipment are transmitted to the display equipment in a unidirectional mode through the unidirectional data physical channel, and the data of the display equipment cannot reach the host equipment through the unidirectional data physical channel, so that the display equipment cannot actively attack the host equipment through a traditional bidirectional physical link, and the data protection and effective protection on the host equipment are increased.
Referring to fig. 1, a connection relationship diagram of an audio/video signal optical unidirectional transmission apparatus, a host device and a display device is shown; referring to fig. 2, a schematic diagram of an audio/video signal optical unidirectional transmission device is shown; the audio and video signal light one-way transmission device provided by the invention has the structure that: the signal input end of the audio/video signal optical unidirectional transmission device is connected with host equipment through a cable; the signal output end of the audio/video signal light unidirectional transmission device is connected with the display equipment through a cable; in practical applications, the connection between the host device and the audio/video signal optical unidirectional transmission apparatus, and the connection between the display device and the audio/video signal optical unidirectional transmission apparatus all use a common video signal interface, for example: VGA, HDMI, DVI, etc.
The audio and video signal optical unidirectional transmission device is mainly responsible for building a unidirectional physical channel of audio and video signals and transmitting data. The audio and video signal optical unidirectional transmission device comprises a first protocol conversion unit, a data coding unit, a physical optical unidirectional unit, a data decoding unit and a second protocol conversion unit which are sequentially connected in series from a signal input end to a signal output end; wherein the physical light unidirectional unit includes a light emitting member, a light emitting member driving circuit, a photosensitive member, and a photosensitive member driving circuit; the light emitting member and the photosensitive member are oppositely disposed; the input end of the light-emitting part driving circuit is connected with the data encoding unit, and the output end of the light-emitting part driving circuit is connected with the light-emitting part; the input end of the photosensitive member driving circuit is connected with the photosensitive member, and the output end of the photosensitive member driving circuit is connected with the data decoding unit. The data coding unit is internally provided with hardware H.264 and H.265 coding modules.
In the invention, the light-emitting component mainly converts an electric signal into an optical signal and sends the optical signal to the photosensitive component; the photosensitive component is responsible for converting the received optical signal into an electric signal and transmitting the electric signal to the data decoding unit through the photosensitive component driving circuit; the data decoding unit is mainly responsible for restoring the received electric signals into standard audio and video signals capable of driving the display equipment and adapting to EDID information of the display equipment.
The invention provides a transmission method of an audio and video signal optical unidirectional transmission device, wherein the audio and video signal optical unidirectional transmission device is a unidirectional physical channel, and host equipment sends audio and video data to display equipment through the audio and video signal optical unidirectional transmission device; the display equipment is forbidden to send audio and video data to the host equipment through the audio and video signal optical unidirectional transmission device;
the audio and video signal optical unidirectional transmission device is a unidirectional physical channel, and the host equipment sends audio and video data to the display equipment through the audio and video signal optical unidirectional transmission device, and the method specifically comprises the following steps:
step 1, the host equipment sends audio data and video data to a first protocol conversion unit through a cable; the video data refers to image signals output by a computer and a television, and comprises VGA (video graphics array), HDMI (high-definition multimedia interface), DVI (digital visual interface) signals and the like.
Step 2, the first protocol conversion unit carries out protocol transcoding on the received audio data and video data to form audio and video mixed data stream;
step 3, the first protocol conversion unit sends the obtained audio and video mixed data stream to a data coding unit;
step 4, a hardware H.264 and H.265 coding module is arranged in the data coding unit, and the data coding unit analyzes the received audio and video mixed data stream according to an audio and video protocol to obtain an analyzed audio and video mixed data stream; then, carrying out redundancy check on the analyzed audio and video mixed data stream, and removing redundant information to obtain the audio and video mixed data stream after redundancy removal; packaging the audio and video mixed data stream after redundancy removal to form transmittable audio and video coded data;
step 5, the data coding unit sends the audio and video coding data obtained in the step 4 to a physical optical unidirectional unit;
and 6, the physical optical unidirectional unit performs unidirectional transmission on the audio and video coded data, and the principle is as follows: the physical optical unidirectional unit carries the electric signal to the optical signal according to the characteristic that the optical transmission has a single direction, so that the data can be transmitted to the photosensitive module from the luminous module only in a unidirectional way, and a reverse physical communication link is avoided. Thus, data is transmitted in a single direction in the link by optical signals. The method specifically comprises the following steps:
step 6.1, the light-emitting part driving circuit receives audio and video coding data from the data coding unit; the light emitting component driving circuit controls the light emitting component to emit light signals with coding characteristics through a physical differential signal link according to the coding characteristics of the audio and video coding data; for example, the audio/video coded data is binary data composed of 0 and 1, 0 corresponds to the characteristic that the light emitting component emits light, and 1 corresponds to the characteristic that the light emitting component does not emit light, so that the light signal with the coding characteristic is obtained by controlling the on-off of the light emitting component.
Step 6.2, the photosensitive component senses the optical signal with the coding characteristic sent by the light-emitting component, and then the photosensitive component converts the optical signal with the coding characteristic into an electrical signal with the coding characteristic;
step 6.3, the photosensitive component sends the electrical signal with the coding characteristic to the photosensitive component driving circuit through the physical differential signal link;
step 6.4, the photosensitive component driving circuit performs signal processing on the received electric signal with the coding characteristic to obtain a transmittable audio/video coding electric signal, and transmits the transmittable audio/video coding electric signal to the data decoding unit;
step 7, the data decoding unit decapsulates the received transmittable audio/video coded electrical signal according to H.264 and H.265 coding and decoding algorithms, restores the decapsulated audio/video electrical signal into an audio/video mixed data stream according to the audio/video coding algorithm, and transmits the audio/video mixed data stream to the second protocol conversion unit;
step 8, the second protocol conversion unit carries out protocol conversion on the received audio and video mixed data stream to separate out audio data and video data; then, the separated audio data and video data are transmitted to the display apparatus.
Therefore, the audio and video signal optical unidirectional transmission device and the method provided by the invention have the advantages that the audio and video signal optical unidirectional transmission device is additionally arranged between the host equipment and the display equipment, so that the audio and video data are unidirectionally transmitted to the display equipment through the audio and video signal optical unidirectional transmission device, the audio and video signals output by the host equipment are unidirectionally transmitted to the display equipment, the display equipment cannot send data to the host equipment, compared with the traditional cable signal communication between the host equipment and the display equipment, the data channel of the host equipment actively attacked by the display equipment is cut off, and the data loss and leakage caused by the attack of the display equipment by the host equipment are avoided.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.
Claims (3)
1. The audio and video signal optical unidirectional transmission device is characterized in that a signal input end of the audio and video signal optical unidirectional transmission device is connected with host equipment through a cable; the signal output end of the audio/video signal light unidirectional transmission device is connected with the display equipment through a cable; the audio and video signal optical unidirectional transmission device comprises a first protocol conversion unit, a data coding unit, a physical optical unidirectional unit, a data decoding unit and a second protocol conversion unit which are sequentially connected in series from a signal input end to a signal output end; wherein the physical light unidirectional unit includes a light emitting member, a light emitting member driving circuit, a photosensitive member, and a photosensitive member driving circuit; the light emitting member and the photosensitive member are oppositely disposed; the input end of the light-emitting part driving circuit is connected with the data encoding unit, and the output end of the light-emitting part driving circuit is connected with the light-emitting part; the input end of the photosensitive member driving circuit is connected with the photosensitive member, and the output end of the photosensitive member driving circuit is connected with the data decoding unit.
2. The optical unidirectional transmission device of audio and video signals according to claim 1, characterized in that the data coding unit is internally provided with hardware H.264 and H.265 coding modules.
3. A transmission method of the audio-video signal optical unidirectional transmission device according to any one of claims 1-2, characterized in that the audio-video signal optical unidirectional transmission device is a unidirectional physical channel, and the host device sends audio-video data to the display device through the audio-video signal optical unidirectional transmission device; the display equipment is forbidden to send audio and video data to the host equipment through the audio and video signal optical unidirectional transmission device;
the audio and video signal optical unidirectional transmission device is a unidirectional physical channel, and the host equipment sends audio and video data to the display equipment through the audio and video signal optical unidirectional transmission device, and the method specifically comprises the following steps:
step 1, the host equipment sends audio data and video data to a first protocol conversion unit through a cable;
step 2, the first protocol conversion unit carries out protocol transcoding on the received audio data and video data to form audio and video mixed data stream;
step 3, the first protocol conversion unit sends the obtained audio and video mixed data stream to a data coding unit;
step 4, the data coding unit analyzes the received audio and video mixed data stream according to the audio and video protocol to obtain the analyzed audio and video mixed data stream; then, carrying out redundancy check on the analyzed audio and video mixed data stream, and removing redundant information to obtain the audio and video mixed data stream after redundancy removal; packaging the audio and video mixed data stream after redundancy removal to form transmittable audio and video coded data;
step 5, the data coding unit sends the audio and video coding data obtained in the step 4 to a physical optical unidirectional unit;
step 6, the physical optical unidirectional unit performs unidirectional transmission on the audio and video coded data, and the unidirectional transmission specifically comprises the following steps:
step 6.1, the light-emitting part driving circuit receives audio and video coding data from the data coding unit; the light emitting component driving circuit controls the light emitting component to emit light signals with coding characteristics through a physical differential signal link according to the coding characteristics of the audio and video coding data;
step 6.2, the photosensitive component senses the optical signal with the coding characteristic sent by the light-emitting component, and then the photosensitive component converts the optical signal with the coding characteristic into an electrical signal with the coding characteristic;
step 6.3, the photosensitive component sends the electrical signal with the coding characteristic to the photosensitive component driving circuit through the physical differential signal link;
step 6.4, the photosensitive component driving circuit performs signal processing on the received electric signal with the coding characteristic to obtain a transmittable audio/video coding electric signal, and transmits the transmittable audio/video coding electric signal to the data decoding unit;
step 7, the data decoding unit decapsulates the received transmittable audio/video coded electrical signal according to H.264 and H.265 coding and decoding algorithms, restores the decapsulated audio/video electrical signal into an audio/video mixed data stream according to the audio/video coding algorithm, and transmits the audio/video mixed data stream to the second protocol conversion unit;
step 8, the second protocol conversion unit carries out protocol conversion on the received audio and video mixed data stream to separate out audio data and video data; then, the separated audio data and video data are transmitted to the display apparatus.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112788299A (en) * | 2021-01-16 | 2021-05-11 | 鸣飞伟业技术有限公司 | Data one-way transmission sharing switching system based on vacuum one-way transmission technology |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100183004A1 (en) * | 2009-01-16 | 2010-07-22 | Stmicroelectronics, Inc. | System and method for dual mode communication between devices in a network |
| US20110145451A1 (en) * | 2008-08-19 | 2011-06-16 | High Sec Labs | Isolated multi-network computer system and apparatus |
| US20110208963A1 (en) * | 2010-02-24 | 2011-08-25 | Aviv Soffer | Secured kvm system having remote controller-indicator |
| US20130050084A1 (en) * | 2009-11-10 | 2013-02-28 | High Sec Labs Ltd. | Secure kvm system having multiple emulated edid functions |
| CN103455161A (en) * | 2012-06-01 | 2013-12-18 | 南京神易网络科技有限公司 | Secure KVM switcher |
| US20140244880A1 (en) * | 2011-09-06 | 2014-08-28 | High Sec Labs Ltd. | Single optical fiber kvm extender |
| WO2018185741A1 (en) * | 2017-04-05 | 2018-10-11 | Fibernet Ltd | Secured kvm switching device with unidirectional communications |
| CN109714500A (en) * | 2019-01-17 | 2019-05-03 | 中孚信息股份有限公司 | A kind of VGA video unidirectional transmission method and device |
-
2019
- 2019-12-16 CN CN201911292920.4A patent/CN110971613A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110145451A1 (en) * | 2008-08-19 | 2011-06-16 | High Sec Labs | Isolated multi-network computer system and apparatus |
| US20100183004A1 (en) * | 2009-01-16 | 2010-07-22 | Stmicroelectronics, Inc. | System and method for dual mode communication between devices in a network |
| US20130050084A1 (en) * | 2009-11-10 | 2013-02-28 | High Sec Labs Ltd. | Secure kvm system having multiple emulated edid functions |
| US20110208963A1 (en) * | 2010-02-24 | 2011-08-25 | Aviv Soffer | Secured kvm system having remote controller-indicator |
| US20140244880A1 (en) * | 2011-09-06 | 2014-08-28 | High Sec Labs Ltd. | Single optical fiber kvm extender |
| CN103455161A (en) * | 2012-06-01 | 2013-12-18 | 南京神易网络科技有限公司 | Secure KVM switcher |
| WO2018185741A1 (en) * | 2017-04-05 | 2018-10-11 | Fibernet Ltd | Secured kvm switching device with unidirectional communications |
| CN109714500A (en) * | 2019-01-17 | 2019-05-03 | 中孚信息股份有限公司 | A kind of VGA video unidirectional transmission method and device |
Non-Patent Citations (1)
| Title |
|---|
| 孙利君: "那些传统外部设备的安全认知误区――从键盘、鼠标和显示器说起", 《保密工作》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112788299A (en) * | 2021-01-16 | 2021-05-11 | 鸣飞伟业技术有限公司 | Data one-way transmission sharing switching system based on vacuum one-way transmission technology |
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