Abstract
With the expansion of Web services, denial of service (DoS) attacks by malicious automated programs (e.g., web bots) is becoming a serious problem of web service accounts. CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a human authentication mechanism that generates and grades tests to determine whether the user is a human or a malicious computer program. These tests are easier for humans to solve and tough for automated bots. We present a novel video CAPTCHA technique based on advertisement recognition. Our CAPTCHA provides a video which contains a predefined advertisement. The user has to identify the product that relates with the advertisement presented in the video by selecting the multiple choice options provided. If the user chooses the right option we can guess that the user is a human and not a bot.
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