@INPROCEEDINGS{Li:VPC:SOUPS2013, author = {Kyriakos Kafas and Nouf Aljaffan and Shujun Li}, title = {Poster: {Visual Password Checker}}, booktitle = {Proceedings of 9th Symposium On Usable Privacy and Security (SOUPS 2013)}, year = {2013}, publisher = {ACM}, note = {poster available online at \url{http://www.hooklee.com/pub.html}}, }