On-Line and Off-Line Handwriting Recognition: A Comprehensive Survey
IEEE Transactions on Pattern Analysis and Machine Intelligence
The Role of Holistic Paradigms in Handwritten Word Recognition
IEEE Transactions on Pattern Analysis and Machine Intelligence
CAPTCHA: using hard AI problems for security
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
Shape context and chamfer matching in cluttered scenes
CVPR'03 Proceedings of the 2003 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
Embedded noninteractive continuous bot detection
Computers in Entertainment (CIE) - Theoretical and Practical Computer Applications in Entertainment
A low-cost attack on a Microsoft captcha
Proceedings of the 15th ACM conference on Computer and communications security
Research of the CAPTCHA application in platform based on AJAX
CEA'09 Proceedings of the 3rd WSEAS international conference on Computer engineering and applications
Research of the chinese CAPTCHA system based on AJAX
WSEAS Transactions on Circuits and Systems
Exploiting the human-machine gap in image recognition for designing CAPTCHAs
IEEE Transactions on Information Forensics and Security
Proceedings of the 2nd ACM workshop on Security and artificial intelligence
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
An efficient segmentation algorithm for CAPTCHAs with line cluttering and character warping
Multimedia Tools and Applications
Attacks and design of image recognition CAPTCHAs
Proceedings of the 17th ACM conference on Computer and communications security
Attacking image recognition CAPTCHAS: a naive but effective approach
TrustBus'10 Proceedings of the 7th international conference on Trust, privacy and security in digital business
Proceedings of the 26th Annual Computer Security Applications Conference
Re: CAPTCHAs: understanding CAPTCHA-solving services in an economic context
USENIX Security'10 Proceedings of the 19th USENIX conference on Security
CAPTCHA phishing: a practical attack on human interaction proofing
Inscrypt'09 Proceedings of the 5th international conference on Information security and cryptology
OTM'06 Proceedings of the 2006 international conference on On the Move to Meaningful Internet Systems: AWeSOMe, CAMS, COMINF, IS, KSinBIT, MIOS-CIAO, MONET - Volume Part I
An effective segmentation for noise-based image verification using gamma mixture models
ACCV'09 Proceedings of the 9th Asian conference on Computer Vision - Volume Part III
Building segmentation based human-friendly human interaction proofs (HIPs)
HIP'05 Proceedings of the Second international conference on Human Interactive Proofs
Collaborative filtering CAPTCHAs
HIP'05 Proceedings of the Second international conference on Human Interactive Proofs
AniCAP: an animated 3d CAPTCHA scheme based on motion parallax
CANS'11 Proceedings of the 10th international conference on Cryptology and Network Security
A novel architecture for the generation of picture based CAPTCHA
ADCONS'11 Proceedings of the 2011 international conference on Advanced Computing, Networking and Security
Breaking a 3d-based CAPTCHA scheme
ICISC'11 Proceedings of the 14th international conference on Information Security and Cryptology
A new CAPTCHA interface design for mobile devices
AUIC '11 Proceedings of the Twelfth Australasian User Interface Conference - Volume 117
A survey and analysis of current CAPTCHA approaches
Journal of Web Engineering
The robustness of hollow CAPTCHAs
Proceedings of the 2013 ACM SIGSAC conference on Computer & communications security
FaceDCAPTCHA: Face detection based color image CAPTCHA
Future Generation Computer Systems
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This paper describes two distortion estimation techniques for object recognition that solve EZ-Gimpy and Gimpy-r, two of the visual CAPTCHAs ("Completely Automated Public Turing test to tell Computers and Humans Apart") with high degrees of success. A CAPTCHA is a program that generates and grades tests that most humans can pass but current computer programs cannot pass. We have developed a correlation algorithm that correctly identifies the word in an EZ-Gimpy challenge image 99% of the time and a direct distortion estimation algorithm that correctly identifies the four letters in a Gimpy-r challenge image 78% of the time.