Unidirectional Video Streaming Device for Secure EDID Emulation
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Solution Overview
Problem
Bi-directional data transmission between video sources and displays poses a security risk, allowing malicious code to spread, while enforcing complete unidirectional transmission can disrupt the ability of video sources to correctly identify and adjust to display settings, leading to operational issues.
Innovation Solution
A device with two interfaces, each comprising a video data channel and a display settings channel, using unidirectional circuitry to allow only video data transmission from the source to the display, while receiving and storing display settings data to emulate the display's EDID, ensuring secure one-way communication and preventing data transmission back to the source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bidirectional data transmission is allowed between video source and display, then the video source can correctly identify and adjust to display settings, but malicious code can spread from the display back to the video source
Solution Approach 1:
The patent segments the data transmission channels into separate unidirectional paths: a first channel for transmitting video data from source to display, and a second channel for transmitting display settings data from display to source. This segmentation allows each channel to be optimized for its specific direction of data flow, enabling the video source to correctly identify display settings while preventing malicious code from propagating back to the source.
Solution Approach 2:
The patent introduces an intermediary device positioned between the video source and display that mediates data transmission. This intermediary receives display settings data from the display and forwards it to the video source through a controlled channel, while simultaneously blocking malicious code from reaching the video source. The intermediary acts as a trusted mediator that enables necessary communication while filtering out harmful data.
2Object-affected harmful factors
If complete unidirectional signal transmission is enforced from video source to display, then malicious data transmission is prevented, but the video source cannot correctly learn display capabilities and settings
Solution Approach 1:
The patent divides the communication channels into segmented unidirectional paths: one channel dedicated to video data transmission from source to display, and another channel dedicated to display settings data transmission from display to source. This segmentation resolves the contradiction by allowing information flow in both directions through separate channels, preventing malicious data transmission while ensuring display settings data is properly transmitted to the video source.
Solution Approach 2:
The patent inverts the traditional bidirectional communication model by implementing unidirectional channels that operate in opposite directions. Instead of allowing bidirectional flow through a single channel, the system creates separate unidirectional paths: video data flows one way while display settings data flows the other way. This inversion enables necessary information exchange while maintaining security by preventing reverse transmission of malicious code.
Data Source
AI summary
A device comprising: at least two interfaces for interconnecting between a video source and a video display, wherein each of said interfaces comprises at least a video data channel and a display settings channel; and unidirectional circuitry; wherein said unidirectional circuitry is configured to allow transmission over said video data channel only from said video source to said video display, and wherein said device is configured to (i) receive, over said display settings channel, display settings data from said video display, and (ii) transmit, over said display settings channel, said display settings data to said video source.