Telling humans and computers apart automatically
Communications of the ACM - Information cities
Understanding web credibility: a synthesis of the research literature
Foundations and Trends in Human-Computer Interaction
Evaluating existing audio CAPTCHAs and an interface optimized for non-visual use
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Proceedings of the 2nd ACM workshop on Security and artificial intelligence
Towards A Universally Usable Human Interaction Proof: Evaluation of Task Completion Strategies
ACM Transactions on Accessible Computing (TACCESS)
On the necessity of user-friendly CAPTCHA
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Teaching captcha in a PHP programming course
Journal of Computing Sciences in Colleges
The SoundsRight CAPTCHA: an improved approach to audio human interaction proofs for blind users
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
PassChords: secure multi-touch authentication for blind people
Proceedings of the 14th international ACM SIGACCESS conference on Computers and accessibility
A survey and analysis of current CAPTCHA approaches
Journal of Web Engineering
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CAPTCHAs are widely used by websites for security and privacy purposes. However, traditional text-based CAPTCHAs are not suitable for individuals with visual impairments. We proposed and developed a new form of CAPTCHA that combines both visual and audio information to allow easy access by users with visual impairments. A preliminary evaluation suggests strong potential for the new form of CAPTCHA for both blind and visual users.