Improved Post-quantum-secure Face Template Protection System Based on Packed Homomorphic Encryption

Hiroto Tamiya, Toshiyuki Isshiki, Kengo Mori, Satoshi Obana, Tetsushi Ohki
BIOSIG 2021: Biometrics and Electronic Signatures, pp. 91-100, Sep 2021.
[ Paper ]

Abstract

This paper proposes an efficient face template protection system based on homomorphic encryption. By developing a message packing method suitable for the calculation of the square Euclidean distance, the proposed system computes the squared Euclidean distance between facial features by a single homomorphic multiplication. Our experimental results show the transaction time of the proposed system is about 14 times faster than that of the existing face template protection system based on homomorphic encryption presented in BIOSIG2020.