International Journal of Network Security
Password authentication schemes are one of the most commonly used solution to protect resources in network environment from unauthorized access. Since, their first introduction, many password authentications schemes have been proposed and analyzed by crypto community. Contribution of the present paper is two-folded. At first it presents the cryptanalysis results of the researchers RSA based password authentication scheme and shows that it is vulnerable to privileged insider attack, password guessing attack and Impersonation attack. Secondly, modifications to the scheme were suggested to overcome the vulnerabilities.