Securing passwords against dictionary attacks
Proceedings of the 9th ACM conference on Computer and communications security
Using graphic turing tests to counter automated DDoS attacks against web servers
Proceedings of the 10th ACM conference on Computer and communications security
Telling humans and computers apart automatically
Communications of the ACM - Information cities
IMAGINATION: a robust image-based CAPTCHA generation system
Proceedings of the 13th annual ACM international conference on Multimedia
Real-Time Computerized Annotation of Pictures
IEEE Transactions on Pattern Analysis and Machine Intelligence
Exploiting the human-machine gap in image recognition for designing CAPTCHAs
IEEE Transactions on Information Forensics and Security
Distortion estimation techniques in solving visual CAPTCHAs
CVPR'04 Proceedings of the 2004 IEEE computer society conference on Computer vision and pattern recognition
Recognizing objects in adversarial clutter: breaking a visual captcha
CVPR'03 Proceedings of the 2003 IEEE computer society conference on Computer vision and pattern recognition
Building segmentation based human-friendly human interaction proofs (HIPs)
HIP'05 Proceedings of the Second international conference on Human Interactive Proofs
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Denial of service attacks at application layer is major threat today. Web Programmers have come out with CAPTCHA (Completely Automated Public Turing test to tell Computers and Human Apart) mechanism to mitigate the impact of DoS attacks. Most of the CAPTCHA today are OCR based which is having two fold limitations. Firstly several automated tools that are capable of reading the CAPTCHA have emerged. Secondly the CAPTCHA is not comfortable for the human to read and feed the correct information online to send their web request. In order to overcome these difficulties a new type of CAPTCHA is introduced namely picture based CAPTCHA. It helps the user to overcome the drawbacks of the previous approach since it's easy to use and understand and is also more secure than text based CAPTCHA. In this paper we propose a redesigned layout (model) for picture based CAPTCHA, which will provide an upper hand than the existing techniques. Our security analysis shows that the proposed model yields better results than other picture based CAPTCHA.