The initial version of this paper was published in https://www.sciencedirect.com/science/article/abs/pii/S0920548906000122?via=ihub

Paper for SAR Image encryption. It was published earlier at https://ieeexplore.ieee.org/document/4777741

The large-scale utilization of biometric authentication systems creates a demand for effective and reliable security and privacy of its data. Biometric data is not secret and if compromised, it can have catastrophic effects on the integrity of the whole verification system. To address these issues, this paper presents a novel encryption and watermarking method by using public key infrastructure for the secure transmission of biometric data over network. Encryption is applied on the biometric template before embedding as a watermark to make it more secure and robust and then, it is hid into the cover image. Experimental results show that the security, performance, and accuracy of the presented method is encouraging comparable with the other methods found in the current literature.

Wu-Chieu proposed an enhanced remote user authentication scheme to improve the security of a user-friendly remote user authentication scheme with smart cards. However, we demonstrate that their scheme is vulnerable and susceptible to the attacks and can easily be cryptanalyzed. Their scheme performs only unilateral authentication (only client authentication) and there is no mutual authentication between user and remote system, so their scheme suscepts from the server spoofing attack. Furthermore, their scheme is slower in detecting the wrong input-password, and users cannot change their passwords. This paper proposes an efficient and secure remote authentication scheme to solve the problems found in Wu-Chieu’s scheme. In addition, the computational costs and efficiency of the proposed scheme is better than other related published schemes.