Security and Privacy Enhanced Gait Authentication with Random Representation Learning and Digital Lockers

Gait data captured by inertial sensors have demonstrated promising results on user authentication. However, most existing approaches stored the enrolled gait pattern insecurely for matching with the validating pattern, thus, posed critical security and privacy issues. In this study, we present a gai...

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Bibliographic Details
Published inarXiv.org
Main Authors Lam, Tran, Nguyen, Thuc, Kim, Hyunil, Choi, Deokjai
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 05.08.2021
Subjects
Artificial neural networks
Authentication
Biometrics
Error correction
Feature extraction
Gait
Inertial sensing devices
Machine learning
Optimization
Privacy
Rejection rate
Security
Strings
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Summary:Gait data captured by inertial sensors have demonstrated promising results on user authentication. However, most existing approaches stored the enrolled gait pattern insecurely for matching with the validating pattern, thus, posed critical security and privacy issues. In this study, we present a gait cryptosystem that generates from gait data the random key for user authentication, meanwhile, secures the gait pattern. First, we propose a revocable and random binary string extraction method using a deep neural network followed by feature-wise binarization. A novel loss function for network optimization is also designed, to tackle not only the intrauser stability but also the inter-user randomness. Second, we propose a new biometric key generation scheme, namely Irreversible Error Correct and Obfuscate (IECO), improved from the Error Correct and Obfuscate (ECO) scheme, to securely generate from the binary string the random and irreversible key. The model was evaluated with two benchmark datasets as OU-ISIR and whuGAIT. We showed that our model could generate the key of 139 bits from 5-second data sequence with zero False Acceptance Rate (FAR) and False Rejection Rate (FRR) smaller than 5.441%. In addition, the security and user privacy analyses showed that our model was secure against existing attacks on biometric template protection, and fulfilled irreversibility and unlinkability.
ISSN:2331-8422