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
A novel user-participating authentication scheme
Journal of Systems and Software
Protection through Intelligent and Multimedia Captchas
International Journal of Adaptive, Resilient and Autonomic Systems
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
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A Captcha驴a completely automatic public Turing test to tell computers and humans apart驴is a test that humans can pass but computer programs cannot; such tests are becoming key to defending e-commerce systems. By using a Captcha, for example, IT systems can permit only real people驴rather than a spammer's script驴to create a free e-mail account. This article explains the various types of Captchas and discusses their strengths and weaknesses as a security measure. It also lists sources for more information on the formal research into Captchas.