A user authentication scheme on multi-server environments for cloud computing

In the cloud computing, user authentication is an important security mechanism because it provides the functions of authentication, authorization, and accounting for cloud servers. However, the previously proposed user authentication schemes have many security and efficiency problems. In addition, these schemes can only work on single server environments. To solve the above problems, we propose a new user authentication scheme on multi-server environments for cloud computing in this paper. Compared with the related works, the proposed scheme has less computation costs. In addition, the proposed scheme can be applied to multi-server environments because the ID-based concept is used. Therefore, the proposed user authentication scheme provides efficiency, security, and flexibility for the cloud computing applications.