Multimedia Interface Protection Control via TEE Segmentation
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Solution Overview
Problem
Existing digital systems and signals, particularly in on-demand multimedia services, face challenges in protecting against malicious attacks due to the need for robust multimedia interface protections that require significant processing power and are difficult to modify, especially when implementing Conditional Access Systems (CAS) and Digital Rights Management (DRM) in systems-on-a-chip (SoC).
Innovation Solution
A method and device for controlling the application of multimedia output interface protections by verifying compliance with security rules, allowing enabling or disabling of interface protections based on the required degree of protection, which can be applied to outgoing signals from multimedia systems, thereby ensuring that the protection level meets the specified security standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multimedia interface protections are implemented in the Rich Execution Environment (REE), then the system can control and apply protections to outgoing signals, but the system becomes vulnerable to malicious attacks due to the REE's exposure to external attacks
Solution Approach 1:
The system divides protection control into two segments: the REE handles high-level protection policy decisions and authorization, while the TEE executes the actual protection application and verification. This segmentation allows the REE to maintain control functionality while the TEE provides security isolation against malicious attacks.
Solution Approach 2:
The TEE acts as an intermediary between the REE and the multimedia output interface protection hardware. The REE sends protection commands to the TEE, which verifies them against security rules and then applies the appropriate protection level to the outgoing signal, mediating between control and execution while maintaining security boundaries.
2Reliability
If the Trusted Execution Environment (TEE) has high processing capacity to directly control multimedia output interface protection, then security verification can be performed, but the system complexity and modification constraints increase
Solution Approach 1:
The TEE performs partial verification by checking protection level compliance rather than implementing the entire protection control stack. The REE handles authorization and policy decisions, while the TEE focuses specifically on verifying that the selected protection level meets security requirements, dividing the workload appropriately.
Solution Approach 2:
The TEE is designed to handle multiple protection protocols and verification scenarios through a universal security rule checking mechanism. Rather than requiring separate hardware blocks for each protection type, the TEE provides a multi-functional security verification layer that can adapt to different protection requirements without major system modifications.
3Reliability
If existing hardware blocks are modified to implement TEE-based protection control, then security is improved, but severe modifications or new designs are required
Solution Approach 1:
The security verification functionality is extracted from the existing REE-based protection control and placed into a separate TEE environment. This extraction allows the core security checking logic to be isolated in a secure, dedicated processing area without requiring modification of the existing multimedia protection hardware blocks, which continue to operate as before but under TEE-verified control.
Data Source
AI summary
A device protects an incoming multimedia signal with a protection that is controllable and configured for enabling or disabling an application for an interface protection on an outgoing signal coming from the incoming signal. An output interface is configured for delivering the outgoing signal on an output. An authorization process is performed for authorizing or otherwise a control over the enabling or disabling of the interface protection application depending on security rules.