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Ibrokhimov, Sanjar, Hui, Kueh Lee, Abdulhakim Al-Absi, Ahmed, lee, hoon jae, Sain, Mangal.  2019.  Multi-Factor Authentication in Cyber Physical System: A State of Art Survey. 2019 21st International Conference on Advanced Communication Technology (ICACT). :279–284.
Digital Multifactor authentication is one of the best ways to make secure authentication. It covers many different areas of a Cyber-connected world, including online payments, communications, access right management, etc. Most of the time, Multifactor authentication is little complex as it require extra step from users. With two-factor authentication, along with the user-ID and password, user also needs to enter a special code which they normally receive by short message service or some special code which they got in advance. This paper will discuss the evolution from single authentication to Multi-Factor Authentication (MFA) starting from Single-Factor Authentication (SFA) and through Two-Factor Authentication (2FA). In addition, this paper presents five high-level categories of features of user authentication in the gadget-free world including security, privacy, and usability aspects. These are adapted and extended from earlier research on web authentication methods. In conclusion, this paper gives future research directions and open problems that stem from our observations.
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Sain, Mangal, Kim, Ki-Hwan, Kang, Young-Jin, lee, hoon jae.  2019.  An Improved Two Factor User Authentication Framework Based on CAPTCHA and Visual Secret Sharing. 2019 IEEE International Conference on Computational Science and Engineering (CSE) and IEEE International Conference on Embedded and Ubiquitous Computing (EUC). :171—175.

To prevent unauthorized access to adversaries, strong authentication scheme is a vital security requirement in client-server inter-networking systems. These schemes must verify the legitimacy of such users in real-time environments and establish a dynamic session key fur subsequent communication. Of late, T. H. Chen and J. C. Huang proposed a two-factor authentication framework claiming that the scheme is secure against most of the existing attacks. However we have shown that Chen and Huang scheme have many critical weaknesses in real-time environments. The scheme is prone to man in the middle attack and information leakage attack. Furthermore, the scheme does not provide two essential security services such user anonymity and session key establishment. In this paper, we present an enhanced user participating authenticating scheme which overcomes all the weaknesses of Chen et al.'s scheme and provide most of the essential security features.