Effect of Random Guessing Attack on Image Based Captchas: Analysis and Survey

Provided by: Academic Science
Topic: Security
Format: PDF
CAPTCHA an abbreviation for Completely Automated Public Turing test to tell Computers and Humans Apart 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 artificial intelligence 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. This paper mainly depict different type of image based captcha and effect of random guessing attack on them.

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