{"id":154703,"date":"2007-10-01T00:00:00","date_gmt":"2007-10-01T00:00:00","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/asirra-a-captcha-that-exploits-interest-aligned-manual-image-categorization\/"},"modified":"2018-10-16T21:21:41","modified_gmt":"2018-10-17T04:21:41","slug":"asirra-a-captcha-that-exploits-interest-aligned-manual-image-categorization","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/asirra-a-captcha-that-exploits-interest-aligned-manual-image-categorization\/","title":{"rendered":"Asirra: A CAPTCHA that Exploits Interest-Aligned Manual Image Categorization"},"content":{"rendered":"
\n

We present Asirra, a CAPTCHA that asks users to identify cats out of a set of 12 photographs of both cats and dogs. Asirra is easy for users; user studies indicate it can be solved by humans 99.6% of the time in under 30 seconds. Barring a major advance in machine vision, we expect computers will have no better than a 1\/54,000 chance of solving it. Asirra\u2019s image database is provided by a novel, mutually beneficial partnership with Petfinder.com. In exchange for the use of their three million images, we display an “adopt me” link beneath each one, promoting Petfinder\u2019s primary mission of finding homes for homeless animals. We describe the design of Asirra, discuss threats to its security, and report early deployment experiences. We also describe two novel algorithms for amplifying the skill gap between humans and computers that can be used on many existing CAPTCHAs.<\/p>\n<\/div>\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

We present Asirra, a CAPTCHA that asks users to identify cats out of a set of 12 photographs of both cats and dogs. Asirra is easy for users; user studies indicate it can be solved by humans 99.6% of the time in under 30 seconds. Barring a major advance in machine vision, we expect computers […]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":null,"msr_publishername":"Association for Computing Machinery, Inc.","msr_publisher_other":"","msr_booktitle":"Proceedings of 14th ACM Conference on Computer and Communications Security (CCS)","msr_chapter":"","msr_edition":"Proceedings of 14th ACM Conference on Computer and Communications Security (CCS)","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"","msr_number":"","msr_organization":"","msr_pages_string":"","msr_page_range_start":"","msr_page_range_end":"","msr_series":"","msr_volume":"","msr_copyright":"Copyright \u00a9 2007 by the Association for Computing Machinery, Inc. 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