# Towards Vulnerability Analysis of Voice-Driven Interfaces and Countermeasures for Replay

## TL;DR

This paper investigates the vulnerability of voice-driven interfaces to replay attacks and introduces a non-learning-based detection method using higher-order spectral analysis to identify replayed audio on smart speakers.

## Contribution

It presents a novel framework modeling replay attack distortion as higher-order nonlinearity and employs HOSA for effective replay attack detection without machine learning.

## Key findings

- Successful detection of replay attacks on Google Home and Amazon Alexa
- Replay attack recordings effectively injected via drop-in conferencing
- Proposed method outperforms traditional detection approaches

## Abstract

Fake audio detection is expected to become an important research area in the field of smart speakers such as Google Home, Amazon Echo and chatbots developed for these platforms. This paper presents replay attack vulnerability of voice-driven interfaces and proposes a countermeasure to detect replay attack on these platforms. This paper presents a novel framework to model replay attack distortion, and then use a non-learning-based method for replay attack detection on smart speakers. The reply attack distortion is modeled as a higher-order nonlinearity in the replay attack audio. Higher-order spectral analysis (HOSA) is used to capture characteristics distortions in the replay audio. Effectiveness of the proposed countermeasure scheme is evaluated on original speech as well as corresponding replayed recordings. The replay attack recordings are successfully injected into the Google Home device via Amazon Alexa using the drop-in conferencing feature.

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Source: https://tomesphere.com/paper/1904.06591