International Journal of Innovative Research in Information Security (IJIRIS)
Remote user authentication scheme is a mechanism which allows a server to authenticate a remote user over an insecure channel. Recently, the researchers made an enhancement based on their remote user authentication scheme using bilinear pairings. The scheme has the merits of no verification table, freely changing password, preventing the forgery attack and the replay attack. However, the authors found some weaknesses of their scheme against the insider attack, the denial of service attack, the server spooling attack and the time synchronization problem.