A New Security Primitive Using Captcha as A Graphical Password

Depends on hard mathematical problems there are many security primitives. But there are many new paradigm, that are still has been underexplored. In this paper based on hard AI problems we present a new security primitive, on top of Captcha technology a novel family of graphical password systems built, which we call Captcha as graphical passwords (CaRP). CaRP can be used as a graphical and Captcha scheme. CaRP has a number of security problems generally it come with online guessing attacks, relay attacks, and if combined with dual-view technologies, shoulder-surfing attacks. Here we can notice one thing that in automatic online guessing attacks CaRP password can be found only in probabilistically even if the password is in the search set. To address the well-known image hotspot problems in popular graphical password system CaRP also offer a novel approach, such as Pass Points, which often leads to weak password choices, CaRP is not panacea, but it offer reasonable security and usability and for improving online security appears to fit well with some practical application.