NDLI: Sequenced Tagged Captcha: Generation and its Analysis

Content Provider	IEEE Xplore Digital Library
Author	Gupta, A. Jain, Ashish Raj, A. Jain, Abhimanyu
Copyright Year	2009
Description	Author affiliation: Department of Information Technology, Delhi College of Engineering, Bawana, New Delhi, India, abhimanyujain2k6@gmail.com (Jain, Abhimanyu) \|\| Department of Information Technology, Netaji Subhas Institute of Technology, Dwarka, email4ady@gmail.com (Raj, A.) \|\| Department of Information Technology, Netaji Subhas Institute of Technology, Dwarka, anand@coe.nsit.ac.in (Gupta, A.) \|\| Department of Information Technology, Netaji Subhas Institute of Technology, Dwarka, ashish.jain2k6@gmail.com (Jain, Ashish)
Abstract	Security of websites and online systems is of paramount concern today. A significant threat comes from malicious automated programs designed to take advantage of online facilities, resulting in wastage of resources and breach of web security. To counter them, CAPTCHAS are employed as a means of differentiating these bots from humans. However, highly sophisticated computer programs evolved over time have kept pace with all the current CAPTCHA generation schemes to render them ineffective. Due to the vulnerability of current CAPTCHAS, generation schemes of greater stability are required. Therefore, in this paper we propose a novel scheme of embedding numbers in text CAPTCHAS. It incorporates two levels of testing that includes identification of displayed characters and secondly interpreting the logical ordering based on the embedded numbers. Our CAPTCHA can be conveniently implemented on web-sites and provides the advantages of robustness and low space requirements. Discussion and conclusion, at the end of the paper, justify our approach.
Starting Page	1286
Ending Page	1291
File Size	4455015
Page Count	6
File Format	PDF
ISBN	9781424429271
DOI	10.1109/IADCC.2009.4809201
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-03-06
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Humans Information security Optical distortion Bandwidth Educational institutions Internet Optical character recognition software Information technology Hip Information analysis
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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