Conference Papers
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Item Cryptanalysis and Improvement of Remote User Authentication Scheme Using Smart Card(Institute of Electrical and Electronics Engineers Inc., 2016) Madhusudhan, R.; Hegde, M.In a distributed environment, one of the major concerns is authentication of remote users. In this sector, legitimate users are more powerful attackers. The remote systems working with password and smart card ensures authorised access. Smart card based remote user authentication schemes have been adopted due to their low computation cost and portability. In 2012, Wen and Li proposed an improved dynamic ID based remote user authentication with key agreement scheme. They stated that their scheme provides protection against impersonation attack and preserves secret information. In this paper, we unveil the drawbacks of Wen and Li's scheme. Also we show that their scheme does not detect wrong password quickly, making it vulnerable to insider and smart card stolen attack. Further the scheme provides no protection for forward secrecy. To solve these security weaknesses, we propose a robust authentication scheme which overcomes all the pointed flaws, by keeping eminence of Wen and Li's scheme. © 2016 IEEE.Item An efficient and secure user authentication scheme with anonymity in global mobility networks(Institute of Electrical and Electronics Engineers Inc., 2017) Madhusudhan, R.; Suvidha, K.S.User authentication is a very important security mechanism for accessing the services while roaming in the global mobility networks. However, the authentication schemes designed are vulnerable to the attacks, hence new requirements should be employed while designing a scheme. In 2014 Gope and Hwang proposed an efficient mutual authentication and key agreement scheme, in which they stated that the scheme provides a strong security to the user anonymity. In this paper we have proved that Gope and Hwang scheme is vulnerable to stolen smart card attack, offline password guessing attack, forgery attack and replay attack. Moreover their scheme fails to preserve user anonymity. Hence a new efficient and secure user authentication scheme with anonymity in global mobility networks is proposed. Furthermore, the security analysis of the proposed scheme is also presented in this paper. Performance analysis shows that the proposed scheme is secure and suitable for practical implementation. © 2017 IEEE.Item An enhanced secure authentication scheme with user anonymity in mobile cloud computing(Institute of Electrical and Electronics Engineers Inc., 2017) Madhusudhan, R.; Suvidha, K.S.With the rapid growth and development in cloud computing and mobility, mobile cloud computing has emerged and becomes the trend of future generation computing paradigm. Cloud offers infrastructure, platform and software services to mobile users through mobile network. The key issues in mobile cloud computing are security and privacy. While analysing security and privacy issues in mobile cloud computing, three aspects should be considered they are: mobile terminal, mobile network and the cloud. To address the key issues in mobile cloud computing, we proposed an authentication scheme which will provide security to the messages exchanged between mobile user and the cloud server. Lee at al. have proposed authentication scheme for roaming service in global mobility networks in 2016. In this paper we have reviewed Lee et al.'s scheme and proved that their scheme is vulnerable to replay attack, man in the middle attack and impersonation attack. Moreover their scheme fails to preserve user anonymity, provides no local password verification and could not achieve perfect forward secrecy. Hence an enhanced secure authentication scheme with user anonymity in mobile cloud computing is proposed. Furthermore, the security analysis of the proposed scheme is also presented in this paper. © 2017 IEEE.Item An improved user authentication scheme for telecare medical information systems(Institute of Electrical and Electronics Engineers Inc., 2018) Madhusudhan, R.; Nayak, C.S.Medical field is one of the many important fields that keeps growing day by day. Since health care is essential for every human being, development of medical systems play a vital role in the overall development of society. With the help of the Internet, medical services are provided through TMIS (Telecare Medicine Information System). During the process, information related to patient is transmitted over open channels and ensuring safety to this information is an essential task. For this, a number of remote user authentication schemes have been proposed and evolved over the time. Chen et al. proposed an authentication scheme for TMIS in 2018. Through analysis of their scheme, it has been shown that their scheme cannot withstand user impersonation attack, server masquerading attack, password guessing attack and cannot preserve user anonymity. These weaknesses have been presented in this paper. In addition to this, an improved scheme has been proposed which overcomes the aforementioned security defects. Also, this paper discusses the security analysis of the proposed scheme, which proves that it is more secure and can be practically implemented. © 2018 ACM.Item An Efficient Two Factor Authentication Scheme Providing Secure Communication in Mobile Cloud Computing(Institute of Electrical and Electronics Engineers Inc., 2019) Madhusudhan, R.; Suvidha, K.S.Integration of mobile networks with cloud computing platform led to development of mobile cloud computing. Since the communication between mobile devices and the cloud computing occur over wireless medium, securing the network becomes paramount. With the thorough literature survey, we found that many two factor authentication schemes proposed so far to preserve user anonymity are vulnerable to various security attacks, they also had shortcomes to achieve security goals. To overcome the issues related to the two factor authentication schemes in mobile cloud computing, a new scheme is proposed. Furthermore, we have simulated the proposed scheme using widely accepted AVISPA (Automated Validation of Internet Security Protocols and Applications) tool. With the simulated result of the proposed scheme, we show that the proposed scheme is secure against active and passive security attacks. Additionally, the proposed scheme is compared with Gope and Hwang's scheme and other related schemes in terms of computational cost and communication overhead. The proposed scheme is efficient, robust and suitable for practical implementation. © 2019 IEEE.Item Smart Card Based Remote User Authentication Scheme for Cloud Computing(Institute of Electrical and Electronics Engineers Inc., 2019) Madhusudhan, R.; Hegde, M.Cloud computing is an emerging technology in modern society. In recent years mobile users and cloud service providers are increased rapidly. In the cloud or any other distributed environment, if the users increased then security risks also increase parallelly. Many security problems are still unclear even after the advanced security measures have been taken. Security of stored data in the server is one of the most challenging issues in the cloud-based environment. Only authorized users should access the stored data of the server. Authentication plays a significant role in providing authorization. Therefore, in cloud computing, authentication is the primary measure to protect the data and the server from an unauthorized user. In this paper, an efficient authentication scheme using the smart card in the cloud environment is proposed. In the proposed scheme, with the help of a single private key, the user can access many cloud services. Also, the proposed scheme resists all security attacks. Through the simulation using the AVISPA tool, it is proved that the proposed scheme is robust and suitable for practical implementation. © 2019 IEEE.