International Journal of Advanced Research in Science, Engineering and Technology (IJARSET)
A secure authentication system is the important aspect of any computer based system but current authentication system suffers from many weaknesses. Textual passwords are the most commonly used mechanism but many users never follow the requirements of password selection. Due to user's habit of choosing meaningful words for password, it can be easily breakable and vulnerable to many attacks. The physical instruments, smart cards or debit cards can be stolen. Many users resist the biometric system because of their intrusive responses and their effects on privacy.