An extended chaotic maps based user authentication and privacy preserving scheme against DoS attacks in pervasive and ubiquitous computing environments

As the era of pervasive and ubiquitous computing comes close, hand-held and smart devices are expected to achieve the dream of all time everywhere computing. Remote user authentication is important to verify the legitimacy of a login user over an insecure communication channel. Furthermore, in order to protect user privacy such that others cannot trace login users by eavesdropping the communication messages, several researchers proposed some dynamic ID-based remote user authentication schemes for providing user anonymity. On the other hand, the denial-of-service (DoS) attacks may make legal users unable to access a remote server by intercepting the authentication message which a login user sends to the remote server. It will make the latest user identities kept by login user and the remote server differ from each other. To ensure user anonymity and prevent such DoS attacks, we propose an extended chaotic map and dynamic ID-based user authentication scheme against DoS attacks. The proposed scheme is suitable for use in pervasive computing environments such as online financial authentication since it can ensure security while maintaining efficiency.