@conference {18593,
	title = {Photo-based authentication using social networks},
	booktitle = {Proceedings of the first workshop on Online social networks},
	series = {WOSN {\textquoteright}08},
	year = {2008},
	month = {2008///},
	pages = {55 - 60},
	publisher = {ACM},
	organization = {ACM},
	address = {New York, NY, USA},
	abstract = {We present Lineup, a system that uses the social network graph in Facebook and auxiliary information (e.g., "tagged" user photos) to build a photo-based Web site authentication framework. Lineup{\textquoteright}s underlying mechanism leverages the concept of CAPTCHAs, programs that are designed to distinguish bots from human users. Lineup extends this functionality to help a Web site ascertain a user{\textquoteright}s identity or membership in a certain group (e.g., an interest group, invitees to a certain event) in order to infer some level of trust. Lineup works by presenting a user with photographs and asking the user to identify subjects in the photo whom a user with the appropriate identity or group membership should know. We present the design and implementation for Lineup, describe a preliminary prototype implementation, and discuss Lineup{\textquoteright}s security properties, including possible guarantees and threats.},
	keywords = {social networks, trust},
	isbn = {978-1-60558-182-8},
	doi = {10.1145/1397735.1397748},
	url = {http://doi.acm.org/10.1145/1397735.1397748},
	author = {Yardi,Sarita and Feamster, Nick and Bruckman,Amy}
}
