Date Added: May 2010
In 2000, Hwang and Li's proposed a new remote user authentication scheme with smart cards. Some researchers pointed out the security weaknesses of Hwang and Li's scheme and they also proposed some modified schemes to avoid these weaknesses. In 2004, the author proposed a new remote user authentication scheme and try to solve the security problems of Hwang and Li's scheme. This paper analyzes that the author's scheme does not satisfy some essential security requirements. The author's scheme does not support mutual authentication, session key generation phase for secure communication. In addition, in the author's scheme, the remote user is not free to change his password.