Secure Conferencing Device Firewall USB Control Filtering
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Solution Overview
Problem
Conferencing devices connected to interactive digital signage (IDS) face security risks due to potential malicious software on laptops and IDS devices, which can infect each other, and existing solutions fail to effectively prevent the transmission of malicious code via USB connections.
Innovation Solution
A secure conferencing device with a firewall component that transmits host or guest mode signals to IDS devices via a single cable, enabling secure communication while preventing malicious code transmission by filtering control signals and using cable retainers to secure connections, ensuring that only video streams are shared.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If USB connections are used to transmit control signals and video streams between devices, then communication functionality is improved, but security risk increases due to potential malicious code transmission
Solution Approach 1:
The patent introduces a USB data transfer controller as an intermediary device between the video controller and the host computer. This controller acts as a mediator that selectively permits or blocks data transmission based on predefined security rules, allowing legitimate video streams to pass through while preventing malicious code from reaching the host computer through the USB connection.
Solution Approach 2:
The patent segments the USB data transmission into different channels or types, distinguishing between video stream data and control signals. By separating these data types and applying different security policies to each, the system enables video communication functionality while blocking potentially harmful control signals that could carry malicious code.
2Reliability
If firewall component filters control signals to prevent malicious code, then security is improved, but communication functionality may be restricted
Solution Approach 1:
The patent changes the parameters of the firewall component by configuring it with specific rules that distinguish between legitimate and malicious control signals. Rather than blocking all control signals universally, the firewall is tuned to permit signals that meet certain criteria (such as those from authorized conferencing software) while blocking others, thus maintaining security without unnecessarily restricting communication functionality.
3Device complexity
If single cable transmits video, audio, control, and power signals, then device complexity is reduced, but signal interference risk increases
Solution Approach 1:
The USB data transfer controller serves as an intermediary that receives all signals through the single cable, separates them into different data types (video, audio, control), and routes them appropriately. This mediation process prevents signal interference by keeping different signal types in separate processing channels while still using a single physical cable connection.
Data Source
AI summary
A secure conferencing device operating in a host or a guest mode. In host mode, the secure conferencing device coupled to an interactive digital signage (IDS) device, grants conference control to a host computer of the IDS device. The secure conferencing device receives a guest control signal and a guest video stream from a guest device, where the secure conferencing device prevents the guest control signal from being communicated to the host computer, yet transmits the guest video stream to the host computer for display on the IDS device. In the guest mode, the secure conferencing device grants conference control to a guest device, enables the guest device to affect a component of the IDS device, but does not enable the guest device to communicate guest control signals to the host computer of the IDS device.