An improved simple user authentication scheme for grid computing

Recently, Lu proposed a simple user authentication scheme for grid computing. The proposed scheme only requires a one-way hash function and server's private key, which is very simple and efficient. However, the authors will show that their scheme is vulnerable to offline password guessing attack. An attacker can obtain correct passwords of the users by using this attack. To defend this attack, we will propose a simple improved scheme for grid computing. We will show that our scheme for grid computing is simple and efficient in contrast to others.