User Friendly Line CAPTCHAs
This addresses usability issues for general users in online security systems, though it appears incremental in the context of existing CAPTCHA improvements.
The paper tackles the problem of CAPTCHAs becoming too difficult for humans by proposing Line CAPTCHAs, a novel technique that focuses on user friendliness while maintaining security.
CAPTCHAs or reverse Turing tests are real-time assessments used by programs (or computers) to tell humans and machines apart. This is achieved by assigning and assessing hard AI problems that could only be solved easily by human but not by machines. Applications of such assessments range from stopping spammers from automatically filling online forms to preventing hackers from performing dictionary attack. Today, the race between makers and breakers of CAPTCHAs is at a juncture, where the CAPTCHAs proposed are not even answerable by humans. We consider such CAPTCHAs as non user friendly. In this paper, we propose a novel technique for reverse Turing test - we call it the Line CAPTCHAs - that mainly focuses on user friendliness while not compromising the security aspect that is expected to be provided by such a system.