A survey on different techniques for biometric template protection

Biometric applications are based on the static and non-static biometric characteristics such as voice, palm, and finger vein, gait, DNA, hand geometry, iris, fingerprint etc. This paper presents an overview of the two types of template protection techniques, namely, (i) feature transformation or cancelable biometric, and (ii) bio-cryptosystems. Combining both the techniques, i.e. feature transformation and bio-cryptosystems, provide a set of hybrid template protection schemes. Multimodal biometric templates are also protected using hybrid template protection schemes. This paper mainly focuses on providing a comprehensive overview of the template protection techniques and multimodal biometric systems for user authentication. In addition to this, the paper gives the overview of various attacks, issues and challenges in biometric recognition system.