@inproceedings{paperid:1026530, author = {Mehrnejad, Maryam and Ghaemi Bafghi, Abbas and Harati, Ahad and Ehsan Toreini}, title = {Multiple SEmantic IMage CAPTCHA}, booktitle = {The 6th International Conference for Internet Technology and Secured Transactions (ICITST-2011)}, year = {2011}, location = {دوبی}, keywords = {Multiple SEIMCHA; Almost Right Response based on Hardness Rate; Semantic Image based CAPTCHA; Upright Orientation; Geometric transformation}, }