Privacy-preserving and verifiable multi-instance iris remote authentication using public auditor

Homomorphic Encryption (HE) is the most widely explored research area to construct privacy-preserving biometric authentication systems due to its advantages over cancelable biometrics and biometric cryptosystem. However, most of the existing privacy-preserving biometric authentication systems using HE assume that the server performs computations honestly. In a malicious server setting, the server may return an arbitrary result to save the computational resources results in false accept/reject. To address this, we propose a privacy-preserving and verifiable multi-instance iris authentication using public auditor (PviaPA). Paillier HE provides confidentiality for the iris templates in PviaPA. A public auditor ensures the correctness of comparator result in PviaPA. Extensive experimental results on benchmark iris databases demonstrate that PviaPA provides privacy to the iris templates with no loss in the accuracy as well as trust on the comparator result.