遠端身份認證法在網際網路上，對於協助伺服器認證遠端使用者，扮演相當吃重的角色。學者Lee和Chiu提出他們的遠端身份認證法，以改良先前的遠端身份認證法。不幸地，本文提出對Lee和Chiu的遠端身份認證法之攻擊，說明他們的方法會遭受偽造攻擊與拒絕服務攻擊。為了克服上述的安全缺失，提出我們的遠端身份認證改良法。在我們的改良法中，使用者可以安全地且自由地挑選與更換自己的通行碼。 Remote authentication schemes play an important role to help server authenticate remote users in the Internet. Lee and Chiu proposed their remote authentication scheme to overcome some security problem in previous remote authentication schemes. Unfortunately, in this paper, some attacks are proposed to show that Lee and Chiu's scheme is vulnerable under the forgery attack and the denial of service attack. To conquer these security problems, our improved scheme is also proposed. So our scheme is more secure than Lee and Chiu's scheme. In our scheme, users freely and securely choose and change their passwords.
