A Framework for Devanagari Script-based Captcha

TL;DR

This paper introduces a Devanagari script-based CAPTCHA framework designed to enhance security for Indian language applications by exploiting differences in reading proficiency between humans and computers.

Contribution

It presents a novel text-based CAPTCHA framework utilizing Devanagari script, tailored for Indian languages, to improve security against automated attacks.

Findings

Effective in distinguishing humans from computers

Applicable to a wide range of Indian language applications

Potential for widespread adoption in Indian internet security

Abstract

Human Interactive Proofs (HIPs) are automatic reverse Turing tests designed to distinguish between various groups of users. Completely Automatic Public Turing test to tell Computers and Humans Apart (CAPTCHA) is a HIP system that distinguish between humans and malicious computer programs. Many CAPTCHAs have been proposed in the literature that text-graphical based, audio-based, puzzle-based and mathematical questions-based. The design and implementation of CAPTCHAs fall in the realm of Artificial Intelligence. We aim to utilize CAPTCHAs as a tool to improve the security of Internet based applications. In this paper we present a framework for a text-based CAPTCHA based on Devanagari script which can exploit the difference in the reading proficiency between humans and computer programs. Our selection of Devanagari script-based CAPTCHA is based on the fact that it is used by a large number of Indian languages including Hindi which is the third most spoken language. There is potential for an exponential rise in the applications that are likely to be developed in that script thereby making it easy to secure Indian language based applications.