Designing human friendly human interaction proofs (HIPs)
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
A multifunctional reading assistant for the visually impaired
Journal on Image and Video Processing
IEEE Security and Privacy
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
Execution Time Prediction for 3D Interactive CAPTCHA by Keystroke Level Model
ICCIT '09 Proceedings of the 2009 Fourth International Conference on Computer Sciences and Convergence Information Technology
CAPTCHA: using hard AI problems for security
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
Sketcha: a captcha based on line drawings of 3D models
Proceedings of the 19th international conference on World wide web
Distortion estimation techniques in solving visual CAPTCHAs
CVPR'04 Proceedings of the 2004 IEEE computer society conference on Computer vision and pattern recognition
CAPTCHA Challenges for Massively Multiplayer Online Games: Mini-game CAPTCHAs
CW '10 Proceedings of the 2010 International Conference on Cyberworlds
Proceedings of the 26th Annual Computer Security Applications Conference
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
3D drag-n-drop CAPTCHA enhanced security through CAPTCHA
Proceedings of the International Conference & Workshop on Emerging Trends in Technology
On authentication factors: "what you can" and "how you do it"
Proceedings of the 6th International Conference on Security of Information and Networks
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CAPTCHA is a standard defence mechanism against bots, or automated programs, that attempt to use web-based services meant for human users. While there are many different types of CAPTCHA schemes that have emerged over the years, to date, the most widely used type is 2D text-based CAPTCHAs. Unfortunately, a large number of 2D CAPTCHA schemes have been successfully broken. Thus, 3D-based CAPTCHAs are seen as an alternative paradigm which has been explored by a number of CAPTCHA designers. 3D CAPTCHAs are meant to overcome the limitations of 2D CAPTCHAs and are supposed to be more robust and secure against automated attacks. To investigate the robustness of 3D text-based CAPTCHAs, this paper presents an approach to breaking a representative 3D CAPTCHA scheme called Teabag 3D. In particular, this paper describes the techniques that were used to break this CAPTCHA, and as such highlights various security issues that have to be considered in order to design better 3D CAPTCHA schemes.