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Research Article Open Access
Online Guessing attacks on Password Based Systems are inevitable and commonly observed against Web Applications. Server Verifies User Name from the Cookie of the User’s Machine, System IP, Catcha, Password of the User, Number of Failure Attempts by the User, Web Browser. This Process of Verification is called as Automated Turing Tests (ATT). Authentication of User will start by asking Secret Questions which was answered during the Registration Phase.Brute force and dictionary attacks on password-only remote login services are now widespread and ever increasing. Enabling convenient login for legitimate users while preventing such attacks is a difficult problem. Automated Turing Tests (ATTs) continue to be an effective, easy-to-deploy approach to identify automated malicious login attempts with reasonable cost of inconvenience to users. Inadequacy of existing and proposed login protocols designed to address large scale online dictionary attacks .we propose a new Password Guessing Resistant Protocol (PGRP), derived upon revisiting prior proposals designed to restrict such attacks. While PGRP limits the total number of login attempts from unknown remote hosts to as low as a single attempt per username, legitimate users in most cases can make several failed login attempts before being challenged with an ATT. We analyze the performance of PGRP with two real-world datasets.