Date Added: Apr 2013
With advancement of computer community and widespread dissemination of network applications, users generally need multiple servers to provide different services. Accordingly, the multi-server architecture has been prevalent, and designing a secure and efficient remote user authentication under multi-server architecture becomes a nontrivial challenge. In last decade, various remote user authentication protocols have been put forward to correspond to the multi-server scenario requirements. However, these schemes suffered from certain security problems or their cost consumption exceeded users' own constrained ability.