BioFast: An Efficient Privacy-Preserving Face Verification Protocol From FHE and Cryptographic Hash Functions

This research paper presents BioFast, a privacy-preserving face verification protocol (a system for confirming someone's identity using their face while keeping their facial data secret) that uses FHE (fully homomorphic encryption, a type of encryption that lets computers process data without decrypting it first) and cryptographic hash functions (mathematical functions that scramble data in a one-way process). The protocol improves on existing methods by introducing more efficient packing techniques for processing multiple calculations at once and replacing interactive garbled circuits (cryptographic methods requiring back-and-forth communication) with a non-interactive comparison scheme, resulting in faster and more efficient face verification.