National Chung Hsing University
At present, if the authors desire any service, the just remote login to a server which provides the service. The password authentication schemes are the well known and the most accepted mechanisms. These schemes use the correct password to authenticate the right user who wants to login the system. Only a legal user who has registered in system with corresponding password can use the system resources. Recently, Wu-Chieu proposed an efficient and friendly remote authentication scheme with smart card. This scheme is very elaborate since no password table in the remote system, and could keep as well as low communication and low computation costs. In addition, freely choosing and changing password is very friendly for users.