Relations among Security Metrics for Template Protection Algorithms

TL;DR

This paper formalizes and discusses the relationships among security metrics for biometric template protection algorithms, aiming to standardize evaluation methods across different approaches.

Contribution

It provides formal definitions for existing security metrics and analyzes their interrelations, facilitating consistent evaluation of biometric protection algorithms.

Findings

Formal definitions of security metrics for biometric protection algorithms.

Analysis of relationships among different security notions.

Enhanced framework for evaluating biometric template security.

Abstract

Many biometric template protection algorithms have been proposed mainly in two approaches: biometric feature transformation and biometric cryptosystem. Security evaluation of the proposed algorithms are often conducted in various inconsistent manner. Thus, it is strongly demanded to establish the common evaluation metrics for easier comparison among many algorithms. Simoens et al. and Nagar et al. proposed good metrics covering nearly all aspect of requirements expected for biometric template protection algorithms. One drawback of the two papers is that they are biased to experimental evaluation of security of biometric template protection algorithms. Therefore, it was still difficult mainly for algorithms in biometric cryptosystem to prove their security according to the proposed metrics. This paper will give a formal definitions for security metrics proposed by Simoens et al. and Nagar et al. so that it can be used for the evaluation of both of the two approaches. Further, this paper will discuss the relations among several notions of security metrics.