User authentication protocol based on human memorable password and using RSA

Until now, authentication protocol using the suggested password is not safe from off-line dictionary attack or password file compromise. On this paper, we define scheme password based authentication protocol (PAP) authentication protocol using password. PAP features managing one value choosing optionally of expressing password of many values. It presents PAP based authentication protocol, PAPRSA using RSA to manage values expressing password. PAPRSA is safe from attack involving off-line dictionary attack, password file compromise and excellent in efficient ways involving pass number, calculation amount.