Implementing Templates Security in Remote Biometric Authentication Systems

This paper presents a novel chaos-based cryptosystem to solve the privacy and security issues of biometric templates in remote biometric authentication over the network. According to the Kerchoff´s principle, security of the cryptosystem resides in secrecy of the secret keys, so in this research, the secret keys are randomly and dynamically generated without any human intervention, and each transaction session has different secret keys. Biometric templates are encrypted by the chaotic cryptographic scheme and modulated by the chaotic spread spectrum modulation technique. Chaotic encryption scrambles the biometric templates into intangible form and chaotic modulation spreads the encrypted templates across a wide band of frequencies, thus make them more difficult to decipher under attacks. Experimental results show that the security, performance, and accuracy of the presented method are encouraging for the practical implementation in real environment