An enhancement of timestamp-based password authentication scheme
Yang and Shieh proposed a timestamp-based password authentication scheme. Chan and Cheng proved that it is insecure. In this paper, we will give a further cryptanalysis of the scheme, and give an easier attack on it. Finally, we will propose an improved scheme that can withstand both of the attacks. Compared to other authentication schemes, this improved scheme allows the host to authenticate a user only with his login request. The host need not keep any secret or information of the user.
password authentication cryptanalysis smart card id-based scheme