Completely Automated Public Turing Tests to Tell Computers and Humans Apart (CAPTCHAs) are the automatic filters that are widely used these days to disallow any automated script that can perform the work of a human. CAPTCHAs are built in such a way that it is very difficult for any automated script to break them. In this paper, a novel approach for EZ-Gimpy CAPTCHAs has been proposed that first...

Article history: Received 9 August 2008 Received in revised form 30 November 2008 Accepted 19 December 2008

for his invaluable guidance, support, time, and understanding (and tolerance) this past year. Lastly, I thank my parents for their perseverance in dealing with me for the last 24 years. It really is quite a feat.

CAPTCHAs are known as Captcha which stands for Completely Automated Public Turing test to tell Computer and Human Apart. used prevent automated scripts from harvesting email addresses publicly accessible forms on the internet submitting them spammers. mostly utilised because computers have a difficult time deciphering text concealed behind distorted visuals, but humans an easier information hid...

CAPTCHAs are widely used by web applications for the purpose of security and privacy. However, traditional text-based not suitable sighted users much less with visual impairments. To address issue, this paper proposes a new mechanism CAPTCHA called HearAct, which is real-time audio-based that enables easy access The user listens to sound something (the “sound-maker”), he/she must identify what ...