Good Features to Track
3D reconstruction using labeled image regions
Proceedings of the 2003 Eurographics/ACM SIGGRAPH symposium on Geometry processing
Designing human friendly human interaction proofs (HIPs)
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
CAPTCHA Challenge Tradeoffs: Familiarity of Strings versus Degradation of Images
ICPR '06 Proceedings of the 18th International Conference on Pattern Recognition - Volume 03
Asirra: a CAPTCHA that exploits interest-aligned manual image categorization
Proceedings of the 14th ACM conference on Computer and communications security
Usability of CAPTCHAs or usability issues in CAPTCHA design
Proceedings of the 4th symposium on Usable privacy and security
A low-cost attack on a Microsoft captcha
Proceedings of the 15th ACM conference on Computer and communications security
CAPTCHA Security: A Case Study
IEEE Security and Privacy
A CAPTCHA Implementation Based on 3D Animation
MINES '09 Proceedings of the 2009 International Conference on Multimedia Information Networking and Security - Volume 02
The robustness of a new CAPTCHA
Proceedings of the Third European Workshop on System Security
CAPTCHA: using hard AI problems for security
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
Distortion estimation techniques in solving visual CAPTCHAs
CVPR'04 Proceedings of the 2004 IEEE computer society conference on Computer vision and pattern recognition
A CAPTCHA Implementation Based on Moving Objects Recognition Problem
ICEE '10 Proceedings of the 2010 International Conference on E-Business and E-Government
A Database and Evaluation Methodology for Optical Flow
International Journal of Computer Vision
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
Enhanced CAPTCHAs: using animation to tell humans and computers apart
CMS'06 Proceedings of the 10th IFIP TC-6 TC-11 international conference on Communications and Multimedia Security
A survey of motion-parallax-based 3-D reconstruction algorithms
IEEE Transactions on Systems, Man, and Cybernetics, Part C: Applications and Reviews
Breaking an animated CAPTCHA scheme
ACNS'12 Proceedings of the 10th international conference on Applied Cryptography and Network Security
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CAPTCHAs are essentially challenge-response tests that are used to distinguish whether a user is a human or a computer. To date, numerous CAPTCHA schemes have been proposed and deployed on various websites to secure online services from abuse by automated programs. However, many of these CAPTCHAs have been found to suffer from design flaws that can be exploited to break the CAPTCHA. Hence, the development of a good CAPTCHA scheme that is both secure and human usable is an important research problem. This paper addresses this problem by presenting AniCAP, a new animated 3D CAPTCHA scheme that is designed to capitalize on the difference in ability between humans and computers at the task of perceiving depth through motion. In this paper, we present the design of AniCAP, along with a formal definition of its underlying Artificial Intelligence (AI) problem family. In addition, we analyze the security issues and considerations concerning AniCAP.