Handling flash crowds from your garage
ATC'08 USENIX 2008 Annual Technical Conference on Annual Technical Conference
Usability of CAPTCHAs or usability issues in CAPTCHA design
Proceedings of the 4th symposium on Usable privacy and security
Proceedings of the 9th workshop on Mobile computing systems and applications
Machine learning attacks against the Asirra CAPTCHA
Proceedings of the 15th 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
What's up CAPTCHA?: a CAPTCHA based on image orientation
Proceedings of the 18th international conference on World wide web
Balancing usability and security in a video CAPTCHA
Proceedings of the 5th Symposium on Usable Privacy and Security
TagCaptcha: annotating images with CAPTCHAs
Proceedings of the ACM SIGKDD Workshop on Human Computation
Investigating CAPTCHAs Based on Visual Phenomena
INTERACT '09 Proceedings of the 12th IFIP TC 13 International Conference on Human-Computer Interaction: Part II
ACM SIGGRAPH Asia 2009 papers
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
An automated reverse turing test using facial expressions
HSI'09 Proceedings of the 2nd conference on Human System 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
Sketcha: a captcha based on line drawings of 3D models
Proceedings of the 19th international conference on World wide web
CAPTCHA smuggling: hijacking web browsing sessions to create CAPTCHA farms
Proceedings of the 2010 ACM Symposium on Applied Computing
Proceedings of the ACM International Conference on Image and Video Retrieval
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
A study of CAPTCHA and its application to user authentication
ICCCI'10 Proceedings of the Second international conference on Computational collective intelligence: technologies and applications - Volume Part II
CAPTCHA phishing: a practical attack on human interaction proofing
Inscrypt'09 Proceedings of the 5th international conference on Information security and cryptology
Effects of age groups and distortion types on text-based CAPTCHA tasks
HCII'11 Proceedings of the 14th international conference on Human-computer interaction: users and applications - Volume Part IV
Proceedings of the 4th ACM workshop on Security and artificial intelligence
Images as sets of locally weighted features
Computer Vision and Image Understanding
SEMAGE: a new image-based two-factor CAPTCHA
Proceedings of the 27th Annual Computer Security Applications Conference
AniCAP: an animated 3d CAPTCHA scheme based on motion parallax
CANS'11 Proceedings of the 10th international conference on Cryptology and Network Security
Do cognitive styles of users affect preference and performance related to CAPTCHA challenges?
CHI '12 Extended Abstracts on Human Factors in Computing Systems
Enhanced STE3D-CAP: a novel 3d CAPTCHA family
ISPEC'12 Proceedings of the 8th international conference on Information Security Practice and Experience
Security and usability challenges of moving-object CAPTCHAs: decoding codewords in motion
Security'12 Proceedings of the 21st USENIX conference on Security symposium
Breaking reCAPTCHAs with unpredictable collapse: heuristic character segmentation and recognition
MCPR'12 Proceedings of the 4th Mexican conference on Pattern Recognition
CAPTCHA suitable for smartphones
ICT-EurAsia'13 Proceedings of the 2013 international conference on Information and Communication Technology
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
A User-friendly Image-Text Fusion CAPTCHA for Secure Web Services
Proceedings of International Conference on Information Integration and Web-based Applications & Services
DeepCAPTCHA: an image CAPTCHA based on depth perception
Proceedings of the 5th ACM Multimedia Systems Conference
FaceDCAPTCHA: Face detection based color image CAPTCHA
Future Generation Computer Systems
A novel gesture-based CAPTCHA design for smart devices
BCS-HCI '13 Proceedings of the 27th International BCS Human Computer Interaction Conference
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