Secure Audio Processing via Coprocessor Isolation
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Solution Overview
Problem
Existing computing systems face challenges in securely processing and transmitting audio information, particularly in ensuring that sensitive audio data is isolated from the host operating system and CPU, which can compromise security and power efficiency.
Innovation Solution
The implementation of a computing device with a host processor and a coprocessor, where the coprocessor runs a secure operating system and manages a secure peer-to-peer connection with an external device, isolating the secure audio processing from the host OS and CPU.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the host operating system and CPU are activated to manage the data path from input to co-processor, then the audio processing can be performed, but the security is compromised and power consumption increases
Solution Approach 1:
The system is divided into two separate operating systems: a host operating system for general computing tasks and a secure operating system running on the audio co-processor for audio processing. This segmentation isolates the audio processing function from the host OS, ensuring that even if the host OS is compromised, the audio data remains secure. The co-processor operates independently with its own secure environment, managing audio data paths without requiring host OS activation.
Solution Approach 2:
The audio processing functionality is extracted from the host operating system and relocated to a dedicated co-processor with its own secure operating system. This extraction removes the audio processing task from the potentially vulnerable host environment and places it in an isolated, secure environment. The co-processor handles audio data independently, eliminating the need for host OS involvement in audio data path management.
2Productivity
If the host operating system manages the data path from input to co-processor, then the audio processing can be coordinated, but the power consumption increases due to unnecessary activation
Solution Approach 1:
The co-processor is designed to be self-sufficient, running its own secure operating system and managing its own data paths independently. The audio processing system can initiate operations directly from the co-processor without requiring host OS activation or intervention. This self-service capability allows the audio processing to proceed autonomously, consuming power only when actually needed for audio tasks rather than maintaining host OS activation continuously.
3Device complexity
If the host operating system is involved in audio data path management, then system coordination is simplified, but security vulnerabilities increase
Solution Approach 1:
A secure operating system acts as an intermediary between the host operating system and the audio processing functions. This intermediary layer provides a secure interface that isolates the host OS from direct access to audio data and processing functions. The secure OS on the co-processor mediates all audio-related operations, ensuring that even if the host OS contains vulnerabilities, they cannot exploit the audio processing system.
Data Source
AI summary
Devices, methods, and systems for secure communications on a computing device. A host operating system (OS) runs on a host processor in communication with a host memory. A secure OS runs on a coprocessor in communication with a secure memory. The coprocessor receives information from an external device over a secure peer-to-peer (P2P) connection. The secure P2P connection is managed by the secure OS and is not accessible by the host OS.