Microphone Authentication Apparatus for Voice Biometric Security
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Solution Overview
Problem
Voice-based biometric authentication systems are vulnerable to attacks, such as voice recording and playback, and malware installation, which can bypass security measures and access multiple devices, highlighting the need for enhanced authentication methods to secure voice user interfaces.
Innovation Solution
A microphone authentication apparatus that includes an analogue-to-digital converter and a data authentication module to generate an authentication certificate for digital microphone data, using hash algorithms and cryptographic techniques like RSA or Elliptic-curve-cryptography, ensuring the authenticity of audio signals before processing, thereby preventing unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If voice-based biometric authentication is implemented, then user convenience and hands-free operation are improved, but security vulnerability to recording and playback attacks increases
Solution Approach 1:
The patent applies preliminary action by embedding an authentication module within the microphone that generates cryptographic authentication data (MAC or digital signature) before the audio signal leaves the microphone. This pre-authentication ensures that any recorded audio cannot be replayed without detection, as the authentication data is tied to the original audio stream and cannot be transferred to recordings.
Solution Approach 2:
The patent introduces an intermediary authentication mechanism between the microphone and the voice processing system. The authentication module acts as a mediator that verifies the authenticity of audio data using cryptographic methods, preventing unauthorized replay of recorded audio while maintaining the convenience of voice-based authentication.
2Productivity
If malware is installed on the device, then access to multiple devices can be obtained with fewer resources, but the complexity of defending against such attacks increases
Solution Approach 1:
The authentication module performs preliminary authentication of audio data at the source (microphone) before it can be processed by potentially compromised systems. By embedding the authentication capability directly in the microphone hardware, the system prevents malware from injecting fake audio or manipulating authentication processes later in the signal chain.
Solution Approach 2:
The patent applies local quality by implementing authentication specifically at the audio input stage where it is most critical. The authentication module is integrated into the microphone itself, providing localized security protection exactly where audio data enters the system, rather than attempting to secure the entire device ecosystem.
3Reliability
If authentication certificates are generated for all audio data, then security against tampering is improved, but processing time and computational overhead increase
Solution Approach 1:
The patent applies partial action by generating authentication data selectively - only for audio data that requires verification. The system can choose to authenticate all audio data or only specific portions based on security requirements, allowing flexibility between security and processing speed.
Solution Approach 2:
The authentication module generates cryptographic authentication data in advance as audio data is being captured, rather than processing it after the fact. This preliminary generation allows authentication to occur in parallel with audio recording, minimizing additional processing time.
Data Source
AI summary
This application relates to the transfer of audio data, and in particular to the verification that data transmitted to a data processing module, such as voice biometric module (111), did originate from a microphone. A microphone authentication apparatus (204) is described having a first input for receiving analogue audio signals from a microphone transducer (201) and an analogue-to-digital converter (202) coupled to said first input for generating digital microphone data based on the received audio signals. A data authentication module (203) generates an authentication certificate (MAC) for certifying that the digital microphone data did pass via the authentication module. The authentication certificate is based on the digital microphone data (DM) and an authentication module key. An output module outputs a digital microphone audio signal based on the digital microphone data with the authentication certificate.