A Lattice-Based Approach to Privacy-Preserving Biometric Authentication Without Relying on Trusted Third Parties

摘要

We propose a two-factor authentication protocol that uses a cryptographic authentication factor (secret key) to add biometric template privacy security against server exposure attack, to any given (non-private, one-factor) biometric authentication scheme based on Hamming-Distance (HD) comparison of stored and queried binary biometric templates. Our protocol provides provable privacy under the hardness of a standard cryptographic lattice problem (Ring-LWE), and provable two-factor impersonation security under malicious client model.