Cancelable biometrics are a group of techniques to transform the input biometric to an irreversible feature intentionally using a transformation function and usually a key in order to provide security and privacy in biometric recognition systems. This transformation is repeatable enabling subsequent biometric comparisons. This paper is introducing a new idea to exploit as a transformation function for cancelable biometrics aimed at protecting the templates against iterative optimization attacks. Our proposed scheme is based on time-varying keys (random biometrics in our case) and morphing transformations. An experimental implementation of the proposed scheme is given for face biometrics. The results confirm that the proposed approach is able to withstand against leakage attacks while improving the recognition performance.

翻译：可撤销生物特征识别技术是一组通过变换函数（通常结合密钥）将输入生物特征有意转化为不可逆特征的方法，旨在保障生物特征识别系统的安全性与隐私性。该变换具有可重复性，支持后续生物特征比对。本文提出一种新型可撤销生物特征变换函数设计思路，旨在保护模板免受迭代优化攻击。所提方案基于时变密钥（本研究中采用随机生物特征）与形变变换技术，并通过人脸生物特征实验验证其可行性。结果表明，该方法在提升识别性能的同时，能够有效抵御泄露攻击。