@article{paperid:1054980, author = {Maryam Mehrnezhad and Ghaemi Bafghi, Abbas and Harati, Ahad and Ehsan Toreini}, title = {PiSHi: click the images and I tell if you are a human}, journal = {International Journal of Information Security}, year = {2016}, volume = {16}, number = {2}, month = {January}, issn = {1615-5262}, pages = {133--149}, numpages = {16}, keywords = {Image CAPTCHA; User interaction patterns; Decision making; Security; Usability}, }