EarPass: Secure and Implicit Call Receiver Authentication Using Ear Acoustic Sensing

• URL: http://arxiv.org/abs/2404.15000v1
• Date: Tue, 23 Apr 2024 13:03:09 GMT
• Title: EarPass: Secure and Implicit Call Receiver Authentication Using Ear Acoustic Sensing
• Authors: Xiping Sun, Jing Chen, Kun He, Zhixiang He, Ruiying Du, Yebo Feng, Qingchuan Zhao, Cong Wu,
• Abstract summary: EarPass is a secure and implicit call receiver authentication scheme for smartphones. It sends inaudible acoustic signals through the earpiece speaker to actively sense the outer ear. It can achieve a balanced accuracy of 96.95% and an equal error rate of 1.53%.
• Score: 14.78387043362623
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Private voice communication often contains sensitive information, making it critical to ensure that only authorized users have access to such calls. Unfortunately, current authentication mechanisms, such as PIN-based passwords, fingerprint recognition, and face recognition, fail to authenticate the call receiver, leaving a gap in security. To fill the gap, we present EarPass, a secure and implicit call receiver authentication scheme designed for smartphones. EarPass sends inaudible acoustic signals through the earpiece speaker to actively sense the outer ear, and records echoes using the top microphone. It focuses on extracting ear-related signals from echoes and performs spectrogram analysis in the magnitude and phase domains. To overcome posture and position variability, EarPass utilizes a learning-based feature extractor for extracting representative features, and a one-class classifier for authentication. EarPass does not increase any burdens on users or change users' call answering habits. Furthermore, it does not require extra devices but only uses the speaker and microphone on the smartphone. We conducted comprehensive experiments to evaluate EarPass's effectiveness and security. Our results show that EarPass can achieve a balanced accuracy of 96.95% and an equal error rate of 1.53%. Additionally, EarPass exhibits resilience against potential attacks, including zero-effort attacks and mimicry attacks.

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