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Benchmarks for Designing a Secure Devanagari CAPTCHA

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Abstract

CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is one of the easiest ways to achieve human authentication on the web sites. Text-based CAPTCHAs are the most popular type of CAPTCHA used on the web sites. Most of the text-based CAPTCHAs are successfully recognized. Devanagari CAPTCHAs are also existing but not used on the web sites. In India, mostly web sites are also displaying the information in native languages so that native citizens can use these public web sites. These web sites may use native language CAPTCHA like Devanagari CAPTCHA. The security of Devanagari CAPTCHA is never tested till date. In this paper, 20 unique Devanagari CAPTCHAs are tested from de-noising and segmentation (character segmentation) point of view. All the 20 designs are successfully de-noised and segmented. A high success rate of segmentation is achieved that ranges from 88.14 to 98.06%. The paper proposes benchmarks for developing a secure text CAPTCHA.

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Acknowledgements

We are thankful to the almighty nature which always guided us when we were losing hope and feeling tired. We are thankful to all the reviewers who helped us in improving the article by giving very valuable suggestions and comments. We are thankful to all the persons who have helped us in collecting the images from the websites. These analyses would have not been possible without collecting a huge database. We have not received any funding assistance from any government and non-government organizations for this research.

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We declare that there is no relationship between this manuscript and any consultancies, stock ownership, honoraria, paid expert testimony, patent applications/registrations, and grants or other funding.

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  1. Panjab University Regional Centre, Sri Muktsar Sahib, Punjab, India

    Mohinder Kumar & Manish Kumar Jindal

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  1. Mohinder Kumar
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  2. Manish Kumar Jindal
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Correspondence to Mohinder Kumar.

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Kumar, M., Jindal, M.K. Benchmarks for Designing a Secure Devanagari CAPTCHA. SN COMPUT. SCI. 2, 45 (2021). https://doi.org/10.1007/s42979-020-00445-z

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