Biblio

With the development of internet of things (IoT) and communication technology, the sensors and embedded devices collect a large amount of data and handle it. However, IoT environment cannot efficiently treat the big data and is vulnerable to various attacks because IoT is comprised of resource limited devices and provides a service through a open channel. In 2018, Sharma and Kalra proposed a lightweight multi-factor authentication protocol for cloud-IoT environment to overcome this problems. We demonstrate that Sharma and Kalra's scheme is vulnerable to identity and password guessing, replay and session key disclosure attacks. We also propose a secure multifactor authentication protocol to resolve the security problems of Sharma and Kalra's scheme, and then we analyze the security using informal analysis and compare the performance with Sharma and Kalra's scheme. The proposed scheme can be applied to real cloud-IoT environment securely.