What's up CAPTCHA?: a CAPTCHA based on image orientation
Rich Gossweiler, Maryam Kamvar, Shumeet Baluja
- Anthology ID:
- DBLP:conf/www/GossweilerKB09
- Volume:
- Proceedings of the 18th International Conference on World Wide Web, WWW 2009, Madrid, Spain, April 20-24, 2009
- Year:
- 2009
- Venue:
- wwwconf_conference
- Publisher:
- ACM
- Pages:
- 841–850
- URL:
- https://doi.org/10.1145/1526709.1526822
- DOI:
- 10.1145/1526709.1526822
- DBLP:
- conf/www/GossweilerKB09
