  Preservation of information and computer security is broadly dependent on the
secured authentication system which is underpinned by password. Text based
password is a commonly used and available system for authentication. But it
bears many limitations like shoulder surfing, dictionary attack, Phishing,
guessing the password etc. In order to overwhelm these vulnerabilities of
ancient textual password, many graphical or image based password authentication
system has been introduced form last few years. But none of this graphical
system is considered as enough adventurous to keep pace with these issues. Here
we have proposed an image based password authentication system which is more
methodical and can cope up with every vulnerability of recent password
authentication system. To make our system hassle free and more reliable, we
will only take username from an user for registration purpose as our system
will generate a unique key number for that particular user and this key will be
used as password for later login procedure. The user name and key both will be
encrypted using a cryptography algorithm to prevent database hacking. There
will be a randomized clickable image grid in our system. By clicking on this
image grid, user will input the password key for login purpose. Here we have
developed another method namely shoulder surfing resistant password. To prevent
the attack of shoulder surfing, if any user wishes to change our system
provided password key then he or she is allowed to do so by using this method.
Besides this method allows user to change the password every single time of
login. A user doesn't need to enter any textual password for authentication in
our recent module and hence combination of all these features improve the
security, usability and user friendliness of our system.
