CHI '86 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
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
Asirra: a CAPTCHA that exploits interest-aligned manual image categorization
Proceedings of the 14th ACM conference on Computer and communications security
A low-cost attack on a Microsoft captcha
Proceedings of the 15th ACM conference on Computer and communications security
Balancing usability and security in a video CAPTCHA
Proceedings of the 5th Symposium on Usable Privacy and Security
Securing the Web Using Human Perception and Visual Object Interpretation
IV '09 Proceedings of the 2009 13th International Conference Information Visualisation
Ubiquitous Computing: Smart Devices, Environments and Interactions
Ubiquitous Computing: Smart Devices, Environments and Interactions
Scene tagging: image-based CAPTCHA using image composition and object relationships
ASIACCS '10 Proceedings of the 5th ACM Symposium on Information, Computer and Communications Security
CAPTCHA: using hard AI problems for security
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
How Good Are Humans at Solving CAPTCHAs? A Large Scale Evaluation
SP '10 Proceedings of the 2010 IEEE Symposium on Security and Privacy
Leveraging cognitive factors in securing WWW with CAPTCHA
WebApps'10 Proceedings of the 2010 USENIX conference on Web application development
A Novel Image Based CAPTCHA Using Jigsaw Puzzle
CSE '10 Proceedings of the 2010 13th IEEE International Conference on Computational Science and Engineering
On the necessity of user-friendly CAPTCHA
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
SEMAGE: a new image-based two-factor CAPTCHA
Proceedings of the 27th Annual Computer Security Applications Conference
CAPTCHA Design: Color, Usability, and Security
IEEE Internet Computing
Security and usability challenges of moving-object CAPTCHAs: decoding codewords in motion
Security'12 Proceedings of the 21st USENIX conference on Security symposium
A new CAPTCHA interface design for mobile devices
AUIC '11 Proceedings of the Twelfth Australasian User Interface Conference - Volume 117
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CAPTCHAs have been widely used in Web applications to prevent service abuse. With the evolution of computing environment from desktop computing to ubiquitous computing, more and more users are accessing Web applications on smart devices where touch based interactions are dominant. However, the majority of CAPTCHAs are designed for use on computers and laptops which do not reflect the shift of interaction style very well. In this paper, we propose a novel CAPTCHA design to utilise the convenience of touch interface while retaining the needed security. This is achieved through using a hybrid challenge to take advantages of human's cognitive abilities. A prototype is also developed and found to be more user friendly than conventional CAPTCHAs in the preliminary user acceptance test.