Aditya Kaushal Ranjan, Binay Kumar. Directional captcha: A novel approach to text based CAPTCHA. In Jaime Lloret Mauri, Sabu M. Thampi, Michal Wozniak, Oge Marques, Dilip Krishnaswamy, Sartaj Sahni, Christian Callegari, Hideyuki Takagi, Zoran S. Bojkovic, Vinod M., Neeli R. Prasad, Jose M. Alcaraz Calero, Joal Rodrigues, Xinyu Que, Natarajan Meghanathan, Ravi Sandhu, Edward Au, editors, 2015 International Conference on Advances in Computing, Communications and Informatics, ICACCI 2015, Kochi, India, August 10-13, 2015. pages 1278-1283, IEEE, 2015. [doi]
Abstract is missing.