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- 613 creator adam-finkelstein.
- 613 creator alex-halderman.
- 613 creator steven-ross.
- 613 type InProceedings.
- 613 label "Sketcha: A Captcha Based on Line Drawings of 3D Models".
- 613 sameAs 613.
- 613 abstract "This paper introduces a captcha based on upright orientation of line drawings rendered from 3D models. The models are selected from a large database, and images are rendered from random viewpoints, affording many different drawings from a single 3D model. The captcha presents the user with a set of images, and the user must choose an upright orientation for each image. This task generally requires understanding of the semantic content of the image, which is believed to be difficult for automatic algorithms. We describe a process called covert filtering whereby the image database can be continually refreshed with drawings that are known to have a high success rate for humans, by inserting randomly into the captcha new images to be evaluated. Our analysis shows that covert filtering can ensure that captchas are likely to be solvable by humans while deterring attackers who wish to learn a portion of the database. We performed several user studies that evaluate how effectively people can solve the captcha. Comparing these results to an attack based on machine learning, we find that humans possess a substantial performance advantage over computers.".
- 613 hasAuthorList authorList.
- 613 isPartOf proceedings.
- 613 keyword "Authentication".
- 613 keyword "auditing on the web".
- 613 keyword "authorization".
- 613 title "Sketcha: A Captcha Based on Line Drawings of 3D Models".