@inproceedings{vonZezschwitz:2015:EDB:2702123.2702202,
 author = {von Zezschwitz, Emanuel and De Luca, Alexander and Janssen, Philipp and Hussmann, Heinrich},
 title = {Easy to Draw, but Hard to Trace?: On the Observability of Grid-based (Un)Lock Patterns},
 booktitle = {Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems},
 series = {CHI '15},
 year = {2015},
 isbn = {978-1-4503-3145-6},
 location = {Seoul, Republic of Korea},
 pages = {2339--2342},
 numpages = {4},
 url = {http://doi.acm.org/10.1145/2702123.2702202},
 doi = {10.1145/2702123.2702202},
 acmid = {2702202},
 publisher = {ACM},
 address = {New York, NY, USA},
 keywords = {authentication, observability, pattern, security},
}