Security Controller for HDMI Video Output Integrity
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Solution Overview
Problem
In the context of 4K UHD video output, the security of video playback is compromised due to the vulnerability of the video driving module in the rich execution environment (REE) to tampering, which can lead to unauthorized changes in output resolution and HDCP encryption status, compromising the security of the video output.
Innovation Solution
A security controller located in the trusted execution environment (TEE) at the hardware layer is introduced to detect in real-time whether the output resolution and HDCP encryption status satisfy the HDCP requirements of the video, and sends instructions to the video display controller to stop output if these requirements are not met, ensuring the security of the video output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the video driving module in the REE is used to control output resolution and HDCP encryption status, then the system has rich software and hardware resources and open accessibility, but the security of video output is compromised due to vulnerability to tampering
Solution Approach 1:
The system is divided into two execution environments: TEE (trusted execution environment) for security-critical operations and REE (rich execution environment) for general video processing. The security controller resides in TEE while the video driving module operates in REE, separating security functions from application functions to prevent tampering while maintaining open accessibility.
Solution Approach 2:
The security controller acts as an intermediary between the decryption module and the video display controller. It verifies HDCP requirements and monitors output parameters, mediating between the open REE video driving module and the security requirements to ensure video output security.
2Reliability
If real-time monitoring of output resolution and HDCP encryption status is implemented, then video output security is ensured, but system complexity increases
Solution Approach 1:
The security controller autonomously monitors output parameters and automatically sends instructions to stop video output when HDCP requirements are not met, without requiring external intervention. This self-service mechanism ensures security while minimizing additional system complexity.
Solution Approach 2:
The security controller continuously monitors output resolution and HDCP encryption status and provides feedback by sending control instructions to the video display controller. This closed-loop feedback mechanism ensures real-time security verification without significantly increasing system complexity.
Data Source
AI summary
A method and an apparatus for controlling video output, where the method includes detecting in real time, by a security controller, whether an output resolution configured in a video display controller and a high-bandwidth digital content protection (HDCP) encryption status configured in a high-definition multimedia interface (HDMI) satisfy an HDCP requirement of a video, and when the HDCP requirement of the video is not satisfied, sending, by the security controller, an instruction to the video display controller instructing the video display controller to stop outputting the video. Hence, when the HDCP requirement of the video is not satisfied the output video is insecure such that the security controller sends the instruction to the video display controller instructing the video display controller to stop outputting the video. Therefore, security of the video output is ensured.