Ph.D. Student, University of TokyoSatsuya Ohata graduated from the Department of Informatics and Image Science, Faculty of Engineering, Chiba University in March 2011. He received his master degree in Information Science and Technology at the Graduate School of Information Science and Technology, The University of Tokyo in March 2013. He is currently enrolled in the doctorate program at the Graduate School of Information Science and Technology, The University of Tokyo. He has been on the technical staff, Innovative Security Research Group, Research Institute for Secure Systems, AIST from May 2012. He engages mainly in the research of public key cryptosystems, provable security, and its applications. He also received the Dean's Award (2013), and the Award on Symposium on Cryptography and Information Security (2014).