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

Summary

Researchers propose BioFast, a privacy-preserving face verification protocol that aims to be more efficient than prior designs built on fully homomorphic encryption (FHE) and garbled circuits. The protocol combines a new packing technique that computes multiple inner products simultaneously over the ring Zq[x]/(x^n+1), with a cryptographic hash-based, non-interactive threshold comparison scheme. The authors report better space and time efficiency than earlier protocols, supported by experimental evaluation.