With the recent tremendous growth in technology, the Internet of Things (IoT) Telecare Medicine Information System (TMIS) is the most widely used medical information system with prominent achievements. Authentication schemes, which use Smart cards, offer the best solution for TMIS applications that in turn provide efficiency and security. Furthermore, authentication schemes that combine passwords and smart cards are considered to be an effective solution for the two-factor authentication scheme. Such schemes contribute to high security along with the public-key cryptosystem. In this research work, a two-factor authentication technique that is both efficient and secure, which makes use of Elliptic Curve Cryptography (ECC) with smart cards, has been proposed. Here, we have used the fundamental assumptions of strong and collision free cryptographic Hash function and Elliptic Curve arithmetic. The proposed authentication technique protects user privacy by allowing registered users to change their passwords without revealing their identity to the server. The proposed authentication scheme has been subjected to formal and informal security investigations. In terms of efficiency and performance, the proposed two-factor authentication technique was compared with the existing relevant two-factor authentication schemes based on ECC. This scheme satisfies the two-factor authentication scheme’s basic security standards.

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Remote user authentication is a continual problem, particularly with mobile and handheld devices such as Personal Digital Assistants (PDAs), Smartcard, Laptops. Providing user authentication for safe access of precious, private information, or personalized services, for every system is difficult User authentication is the primary line of defence for a handheld device that falls into the hands of an unauthorized individual. Password or Personal Identification Number (PIN) based authentication is the leading mechanism for verifying the identity of actual device users. Remote authentication is the best solution for remote accessing in smart card environment. In this paper we propose a Password based authentication scheme using ECC for smart card environment, without maintaining the password table by the server. It provides high security at a reasonable computational cost. Furthermore it restricts most of the current attacking mechanisms. It is simple and can be adopted in any kind of lightweight devices.