01330nas a2200193   4500000000100000000000100001008004100002260000900043653001900052653002600071653002400097653001600121100002000137700001800157245007500175300001200250490000700262520086700269       2006                            d  c200610aCommunications10aRemote Authentication10aResource Protection10aSmart Cards1 aChin-Chen Chang1 aJung- San Lee00aAn Efficient and Secure Remote Authentication Scheme Using Smart Cards  a122-1330 v183 a<p>Security of data communication becomes a crucial challenge due to the rapid development of computer and information technologies. To ensure security of resource transmission, engineers have proposed numerous schemes for protection. Among them, the remote password authentication schemes using smart cards are regarded as very efficient. As a result, smart-card based authentication schemes has become a popular research topic in recent years. In 2000, Hwang and Li proposed a new remote authentication scheme using smart cards based on ElGamal’s crypto-system. Unfortunately, the scheme Hwang and Li propose suffers from some security flaws. In this article, the authors propose a practical and secure version providing mutual authentication, increasing the authentication efficiency, and allowing the user to choose and change his/her password at will.</p>