Design and Generation of Devanagari Script CAPTCHA: Imaginative Technique
Sanjay E. Pate, Rakesh Jagdish Ramteke · Advances in intelligent systems research/Advances in Intelligent Systems Research · 2023
CAPTCHA (Completely Automated Public Turing Tests to Tell Computers and Humans Apart).Only humans can pass this test, but existing computer systems cannot.It's used in a variety of machine and human identification applications.The most common type of CAPTCHA used on websites is textbased.This protected CAPTCHA script is largely made up of English letters, making it difficult for rural people who only speak their local languages to pass the test.Devanagari characters feature more sophisticated characters than typical English characters and numeral-based CAPTCHAs, considerably increasing the challenge of machine recognition.In India, most government websites present information in the Devanagari language.However, Devanagari CAPTCHAs are not utilized on websites.Therefore, we have designed a new Devanagari script textbased CAPTCHA in this article.There are 33 different varieties of Devanagari CAPTCHA images, of varying lengths (5 to 7), generated using printed and handwritten Devanagari characters and numeral combinations.Using digital image processing techniques, general rules for CAPTCHA generation are utilized to introduce noise to the CAPTCHA image so that it is not recognized or broken.The generation of a single CAPTCHA image requires 1.08 ms and 8 KB of storage.A dataset of 1,10,000 (one million and ten thousand) CAPTCHA images was created, requiring storage of 964 MB.