Abstract: The rapid development of the Internet of Things has brought great convenience to peoples production and life, but how to ensure the information security of users is an important issue that must be solved in the development of the Internet of Things. In order to solve this problem, researchers must propose a more secure identity authentication protocol under the premise of increasing the amount of computation. Nikooghadam et al. proposed a protocol to protect user identity. This paper analyzes it and finds some disadvantages. Based on the protocol of Nikooghadam et al., an improved remote user authentication protocol is proposed. BAN logic is adopted to verify the protocol. Performance comparison and computational efficiency analysis are also carried out, and the results show that the proposed protocol has higher security under the premise of increasing the amount of computation.

Key words: identity authentication, smart card, anonymity, Internet of Things