@inproceedings{schneegass2014ubicomp,
 author = {Schneegass, Stefan and Steimle, Frank and Bulling, Andreas and Alt, Florian and Schmidt, Albrecht},
 title = {SmudgeSafe: Geometric Image Transformations for Smudge-resistant User Authentication},
 booktitle = {Proceedings of the 2014 ACM International Joint Conference on Pervasive and Ubiquitous Computing},
 series = {UbiComp '14},
 year = {2014},
 isbn = {978-1-4503-2968-2},
 location = {Seattle, Washington},
 pages = {775--786},
 numpages = {12},
 url = {http://doi.acm.org/10.1145/2632048.2636090},
 doi = {10.1145/2632048.2636090},
 acmid = {2636090},
 publisher = {ACM},
 address = {New York, NY, USA},
 keywords = {finger smudge traces, graphical passwords, touch input},
}