MEMS Microphone Light-Signal Rejection for Voice Injection Defense
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Solution Overview
Problem
Computing devices are vulnerable to light-based injection attacks, where modulated light is used to bypass security defenses and manipulate voice commands, allowing unauthorized access and control.
Innovation Solution
A computing device equipped with an input manager, an audio sensor featuring subtracting circuitry, and a light sensor, which analyzes signals from both sensors to detect and prevent light-based injection attacks by subtracting light signals from audio signals, thereby rejecting injected voice commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional audio sensors are used without light detection capability, then audio sensing function is maintained, but vulnerability to light-based injection attacks increases
Solution Approach 1:
The patent combines a light sensor and an audio sensor into an integrated sensor system. The light sensor and audio sensor are merged at the circuit level, allowing simultaneous detection of both light and audio signals. This integration enables the system to detect light-based injection attacks while maintaining audio sensing functionality, resolving the contradiction between security reliability and device complexity.
Solution Approach 2:
The integrated sensor system performs multiple functions: it detects legitimate audio signals for normal operation and simultaneously detects modulated light signals for security threat identification. By making the sensor system universal, it can handle both audio processing and security detection tasks, improving reliability without requiring completely separate systems.
2Ease of manufacture
If light sensors are integrated within the MEMS microphone, then manufacturing cost is reduced and compatibility is maintained, but signal separation and detection precision become more challenging
Solution Approach 1:
The patent segments the sensor system into distinct functional components: a light sensor portion and an audio sensor portion, each with dedicated signal processing paths. The light sensor detects optical signals while the audio sensor detects acoustic signals, and their outputs are processed separately before being combined or compared. This segmentation enables precise signal separation despite physical integration, maintaining measurement precision while achieving manufacturing simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively detects and prevents light-based injection attacks, enhancing security defenses without hindering legitimate audio sensing, and integrates light sensors within the MEMS microphone to reduce costs and maintain compatibility.
Implementation Method 1
a light sensor. One or more processors executing instructions of the input manager is configured to receive and analyze signals generated by the audio sensor, the light sensor
Implementation Method 2
an audio sensor having subtracting circuitry... subtracting light signals from audio signals, thereby rejecting injected voice commands
Data Source
AI summary
This document describes techniques and apparatuses directed at detecting and preventing light-based injection attacks. In aspects, a computing device includes executable instructions of an input manager, an audio sensor having subtracting circuitry, and a light sensor. One or more processors executing instructions of the input manager is configured to receive and analyze signals generated by the audio sensor, the light sensor, and the subtracting circuit. Upon analysis, the input manager can detect and prevent light-based injection attacks.