Faculty Publications

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    The Role of Cryptography in Cryptocurrency
    (Institute of Electrical and Electronics Engineers Inc., 2021) Gupta, S.P.; Gupta, K.; Chandavarkar, B.R.
    In today's world of digital media, people are mainly sharing all of their resources via digital platforms. Today, in almost all regions across the globe, the physical exchange of money is becoming less in practice. People are more flexible with buying and paying for their necessities via digital platforms rather than exchanging physical money. Cryptocurrency, the new global money for the internet age, is also a medium of exchange similar to other currencies. Still, here, the sole purpose of the exchange is via digital means. How secure is your cryptocurrency? How anonymous are users of cryptocurrencies? Since the currency is digital, it is more prone to attacks, data theft, and money. Here comes the role of cryptography. Cryptography is an essential mechanism for securing information in computer systems. Without cryptography, cryptocurrency is just a central hub for attackers and scammers. Cryptocurrency requires cryptography for mainly two purposes; to secure the transactions and to verify these transfers. This paper discusses the types of cryptographic techniques used in cryptocurrencies, studies their characteristics, and explores the working of these techniques. © 2021 IEEE.
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    A robust authentication scheme for telecare medical information systems
    (Springer New York LLC barbara.b.bertram@gsk.com, 2019) Madhusudhan, R.; Nayak, C.S.
    With the speedy progress in technology, the Internet has become a non-separable part of human life. It is obvious to use the Internet in all fields and medical field is no exception. The concept of establishing telecare medicine information systems(TMIS) for patients is gaining more popularity recently. To ensure the privacy of patients and to allow authorized access to remote medical servers, many authentication schemes have been proposed. Li et al., in 2016, proposed a secure dynamic identity and chaotic maps based user authentication and key agreement scheme. They claimed that the scheme is resistant to most of the known attacks. However, from thorough cryptanalysis, we have proved that their scheme is vulnerable to user impersonation attack, password guessing attack and server impersonation attack. We have also illustrated that their scheme does not provide user anonymity, convenient smart card revocation and security to session key. To overcome the aforementioned security weaknesses, we have proposed an enhanced authentication scheme using chaotic maps, which has been discussed in this paper along with its cryptanalysis. Cryptanalysis of the proposed scheme proves that the scheme is more robust and suitable for implementation. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.
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    An improved user authentication scheme for electronic medical record systems
    (Springer, 2020) Madhusudhan, R.; Nayak, C.S.
    Electronic Medical Record (EMR) systems is a part of e-healthcare system, which is developing rapidly. In this, it is possible to deliver medical services among multiple participants over a network without physical presence. Since sensitive data is transmitted over public channels, it is very much required to maintain the secrecy of that data. This is achieved by mutual authentication between the participants. For this, various schemes for authentication with smart cards have been proposed. Han et al. proposed one such biometrics-based scheme for the same purpose using hash functions along with symmetric key encryption and elliptic curve cryptography. From cryptanalysis of their scheme, we have pointed out weaknesses viz. no user anonymity, user and server impersonation, man-in-the-middle attack. These security issues have been presented in this article. To overcome these attacks, a scheme has been proposed in this article. Since it does not use symmetric key encryption, the proposed scheme reduces the computational complexity as can be seen in the comparison provided. The security analysis of the proposed scheme, along with BAN (Burrows-Abadi-Needham) logic has been explained in detail. Comparison of the proposed scheme with related schemes with respect to computation cost, execution time and performance is demonstrated. This proves that the proposed scheme performs well in terms of security as well as computational efficiency. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.