Two-Way Image Based CAPTCHA
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CAPTCHA is a technology used to protect web applications from one of the malicious threats called BOT. CAPTCHA’s primary goal is to avail web services only to legitimate users and thereby foreseeing effective usage of web services. In this paper, a variant of image-based CAPTCHA is designed for visually challenged people. The main challenge is to identify human users from software robots. A novel two-way approach for image selection is designed to enhance the existing image-based CAPTCHAs. Randomly generated homography transformation function is used to find a match between the two images. Image-based CAPTCHAs have overwhelmed the text-based CAPTCHAs, and the proposed approach promises a better test for legitimate users to accomplish higher web security while retaining ease of use.
KeywordsWeb services CAPTCHA Image-based display Internet security Image matching
The authors would like to thank Manipal Institute of Technology, Manipal, for all the resources granted as per the requirements.
Compliance with Ethical Standards
The study involved only development, validation and feedback on the technical aspect of the software. Hence, clearance from only the Information and Communication department committee was obtained. Informed consent was obtained from all volunteers included in the study.
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