DESIGN PAIR BASED ALGORITHM FOR SELECTION OF CAPTCHA TO GET BETTER SECURITY AGAINST HARD AI

Abstract

In this paper, we present a new security primitive based on hard AI problems, a novel family of graphical password system on
CAPTCHA technology. It calls CAPTCHA as graphical passwords (CaRP). CaRPis both a CAPTCHA and a graphical password method.
CaRP shows a number of security problems including online guessing attacks. ACaRP password can occur automatically, in online
guessing attacks even if password is in search set. CaRP provide security, usability and appears to fit well some practical applications for improving online security. Now, we proposed a pair based authentication scheme. At the time of registration
we used an email id and password. But when we login the page, at that time the third term occur i.e. CAPTCHA. Now the CAPTCHA is generated using a pair based authentication scheme. CAPTCHA character are changes their location on new session