@inproceedings {180203,
	author = {Y Xu and G Reynaga and Sonia Chiasson and J.-M. Frahm and Fabian Monrose and Paul van Oorschot},
	title = {Security and Usability Challenges of {Moving-Object} {CAPTCHAs}: Decoding Codewords in Motion},
	booktitle = {21st USENIX Security Symposium (USENIX Security 12)},
	year = {2012},
	isbn = {978-931971-95-9},
	address = {Bellevue, WA},
	pages = {49--64},
	url = {https://www.usenix.org/conference/usenixsecurity12/technical-sessions/presentation/xu_y},
	publisher = {USENIX Association},
	month = aug
}
