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We introduce captcha, an automated test that humans can pass, but current computer programs can't pass: any program that has high success over a captcha can be used to solve an unsolved Artificial ...
This paper covers how Web professionals can combat certain automated attacks with CAPTCHA. Web sites are increasingly under attack from automated scripts. In many cases, sites could deter automated ...
We present a new CAPTCHA which is based on identifying an image's upright orientation. This task requires analysis of the often complex contents of an image, a task which humans usually perform well ...
An introduction to developing secure CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart)1 systems. In addition to describing common weaknesses in CAPTCHA puzzles, ...
CAPTCHA is now almost a standard security technology. The most widely used CAPTCHAs rely on the sophisticated distortion of text images rendering them unrecognisable to the state of the art of ...
CAPTCHAs protect online resources and services from automated access. From an attacker's point of view, they are typically perceived as an annoyance that prevents the mass creation of accounts or the ...
We present a technique for using content-based video labeling as a CAPTCHA task. Our CAPTCHAs are generated from YouTube videos, which contain labels (tags) supplied by the person that uploaded the ...




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