Please use this identifier to cite or link to this item:
http://hdl.handle.net/10603/384773
Title: | Designing Secure and Usable CAPTCHA in Hindi Language |
Researcher: | Mohinder Kumar |
Guide(s): | Manish Kumar |
Keywords: | CAPTCHA De-CAPTCHA Digital Image Processing Hindi CAPTCHA Machine Learning Optical Character Recognition Reverse Turing Test |
University: | Panjab University |
Completed Date: | 2021 |
Abstract: | Completely Automated Public Turing test to tell Computers and Humans Apart (CAPTCHA) is a popular term used for Human Interaction Proofs. After getting such a high breaking rate of all kinds of CAPTCHAs, it is a dire need to find an alternate solution. The 4th widely spoken language in the world is also Hindi. It motivated us to design a text-based CAPTCHA in the Hindi language. Some Hindi language-based CAPTCHAs exist, but security testing is not done on these designs. We collected 20 unique Hindi CAPTCHAs to test the security. We achieved 57% to 93% breaking rate for collected 20 CAPTCHA schemes. We derived some benchmarks to design a more secure and useable CAPTCHA and developed a novel Hindi CAPTCHA. The length of the proposed Hindi CAPTCHA varies from 5 to 8 characters. It has a combination of 5 different segments. We have generated two versions of the proposed CAPTCHA. We tried to break these schemes with the proposed CAPTCHA breaking algorithms. We have achieved a low segmentation rate for Version 1.0 and Version 2.0 that ranges from 0.12% to 7.16% and 0% to 2.03% respectively. Both versions are segment proof. For testing usability, we generated 1200 CAPTCHA samples of each version. In the usability testing, 60 users have participated. We got 90.67% and 62.34% recognition accuracy for Version 1.0 and Version 2.0. The average time to solve a single image was about 10.13 seconds and 13.5 seconds for Version 1.0 and Version 2.0, respectively. It places Version 1.0 in the sweet spot that is the desired property of a CAPTCHA. newline |
Pagination: | xxi, 214p. |
URI: | http://hdl.handle.net/10603/384773 |
Appears in Departments: | Department of Computer Science and Application |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
01_title.pdf | Attached File | 8.32 kB | Adobe PDF | View/Open |
02_certificate.pdf | 1.86 MB | Adobe PDF | View/Open | |
03_acknowledgement.pdf | 175.6 kB | Adobe PDF | View/Open | |
04_abstract.pdf | 32.62 kB | Adobe PDF | View/Open | |
05_llist of acronym.pdf | 30.72 kB | Adobe PDF | View/Open | |
06_contents.pdf | 238.75 kB | Adobe PDF | View/Open | |
07_list_of_figures.pdf | 39.43 kB | Adobe PDF | View/Open | |
08_list_of_tables.pdf | 56.7 kB | Adobe PDF | View/Open | |
09_chapter_1.pdf | 1.18 MB | Adobe PDF | View/Open | |
10_chapter_2.pdf | 1.16 MB | Adobe PDF | View/Open | |
11_chapter_3.pdf | 1.98 MB | Adobe PDF | View/Open | |
12_chapter_4.pdf | 8.62 MB | Adobe PDF | View/Open | |
13_chapter_5.pdf | 914.06 kB | Adobe PDF | View/Open | |
14_chapter_6.pdf | 2.38 MB | Adobe PDF | View/Open | |
15_chapter_7.pdf | 3.1 MB | Adobe PDF | View/Open | |
16_chapter_8.pdf | 506.78 kB | Adobe PDF | View/Open | |
17_references.pdf | 498.36 kB | Adobe PDF | View/Open | |
18_list of publications.pdf | 286.45 kB | Adobe PDF | View/Open | |
80_recommendation.pdf | 459.07 kB | Adobe PDF | View/Open |
Items in Shodhganga are licensed under Creative Commons Licence Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0).
Altmetric Badge: