Science & Engineering Research Support soCiety (SERSC)
With the rapid development of computer network technology, more and more people use the services of the remote servers. Authentication between user and server has become more and more important in the insecure network. The authors proposed a user-participating authentication scheme. The CAPTCHA techniques and visual secret sharing is used in their scheme. The scheme can complete mutual authentication and resist certain known attacks. But for password guessing attack and denial-of-service attack, it cannot resist. Therefore, an improved scheme to eliminate these weaknesses is proposed in this paper.