Dheerendra Mishra

Dheerendra Mishra

Advancement in communication technology provides a scalable platform for various services where a remote user can access the server from anywhere without moving from its place. It has provided a unique opportunity for online services, such that the user need not physically present at the service center. These services adopt authentication and key agreement protocols to ensure authorized and secure access to resources. Most of the authentication schemes support single server environment where the user has to register with each server. If a user wishes to access multiple application servers, he requires to register with each of the servers. Although multi-server authentication schemes introduced a scalable platform such that a user can interact with any server using single registration. Recently, Chuang and Chen proposed an efficient multi-server authenticated key agreement scheme based on smart cards along with password and biometrics. This is a lightweight authentication scheme which requires the computation of only hash function. In this article, we present a brief review of Chuang and Chen's scheme. We analyze Chuang and Chen's scheme and identify that their scheme does not resist stolen smart card attack which causes the user's impersonation attack, server spoofing attack and man-in-the middle attack. Additionally, we show that their scheme has a weak key agreement protocol, which does not ensure forward secrecy.

Dheerendra Mishra, Ankita Chaturvedi, Sourav Mukhopadhyay

The smart card based authentication protocols try to ensure secure and authorized communication between remote entities. In 2012, Wei et al. presented an improvement of Wu et al.'s two-factor authentication scheme for TMIS which is proven vulnerable to off-line password guessing attack by Zhu. Zhu also proposed a modified scheme to overcome with weakness of Wei et al.'s scheme, although Lee and Liu showed the failure of his scheme to resist parallel session attacks. Moreover, Lee and Liu introduced an improved scheme. We analyze Wei et al.'s, Zhu's and Lee and Liu's schemes and identify that none of the schemes resist on-line password guessing attack. Moreover, these schemes do not present efficient login and password chance phase. We also show that how inefficient password change phase causes denial of service attack. Further, we propose an improved password based remote user authentication scheme with the aim to eliminate all the drawbacks of previously presented schemes.

Dheerendra Mishra

The smart card based authentication schemes are designed and developed to ensure secure and authorized communication between remote user and the server. In recent times, many smart card based authentication schemes for the telecare medical information systems (TMIS) have been presented. In this article, we briefly discuss some of the recently published smart card based authentication schemes for TMIS and try to show why efficient login and password change phases are required. In other word, the study demonstrates how inefficient password change phase leads to denial of server attack and how inefficient login phase increase the communication and computation overhead and decrease the performance of the system.

Dheerendra Mishra

Dynamic ID-based remote user authentication schemes ensure efficient and anonymous mutual authentication between entities. In 2013, Khan et al. proposed an improved dynamic ID-based authentication scheme to overcome the security flaws of Wang et al.'s authentication scheme. Recently, Sun and Cao showed that Khan et al. does not satisfies the claim of the user's privacy and proposed an efficient authentication scheme with user anonymity. The Sun and Cao's scheme achieve improvement over Khan et al.'s scheme in both privacy and performance point of view. Unfortunately, we identify that Sun and Cao's scheme does not resist password guessing attack. Additionally, Sun and Cao's scheme does not achieve forward secrecy.

Dheerendra MIshra

The Telecare medicine information system (TMIS) is developed to provide Telecare services to the remote user. A user can access remote medical servers using internet without moving from his place. Although remote user and server exchange their messages/data via public networks. An adversary is considered to be enough powerful that he may have full control over the public network. This makes these Telecare services vulnerable to attacks. To ensure secure communication between the user and server many password based authentication schemes have been proposed. In 2013, Hao et al. presented chaotic maps-based password authentication scheme for TMIS. Recently, Lee identified that Hao et al.'s scheme fails to satisfy key agreement property, such that a malicious server can predetermine the session key. Lee also presented an efficient chaotic map-based password authentication and key agreement scheme using Smart cards for TMIS. In this article, we briefly review Lee's scheme and demonstrates the weakness of Lee's scheme. The study shows that the Lee's scheme inefficiency of password change phase causes denial of service attack and login phase results extra computation and communication overhead.

Dheerendra Mishra, Sourav Mukhopadhyay

Remote user authentication is desirable for a Telecare medicine information system (TMIS) to verify the correctness of remote users. In 2013, Jiang et al. proposed privacy preserving authentication scheme for TMIS. Recently, Wu and Xu analyzed Jiang's scheme and identify serious security flaws in their scheme, namely, user impersonation attack, DoS attack and off-line password guessing attack. In this article, we analyze Wu and Xu's scheme and show that their scheme is also vulnerable to off-line password guessing attack and does not protect user anonymity. Moreover, we identify the inefficiency of incorrect input detection of the login phase in Wu and Xu's scheme, where the smart card executes the login session in-spite of wrong input.

Dheerendra Mishra, Sourav Mukhopadhyay

Remote user authentication is desirable for a Telecare medicine information system (TMIS) to verify the correctness of remote users and server over the insecure channel. We propose an authentication scheme for TMIS.

Dheerendra Mishra, Sourav Mukhopadhyay

Telecare medicine information systems (TMIS) present the platform to deliver clinical service door to door. The technological advances in mobile computing are enhancing the quality of healthcare and a user can access these services using its mobile device. Existing authentication schemes for TMIS are either vulnerable to attacks or they have higher computational cost. We propose a biometric based efficient authentication scheme for TMIS which only requires the computation of the hash and XOR functions.