Ph.D. Student, University of California, DavisYusi Zhang is a 2nd year CS Ph.D. student in University of California, Davis. His adviser is Prof. Phillip Rogaway and his main research area is provable security in symmetric cryptography. He is also interested in the underlying mathematical foundations of modern cryptology. Zhang went through a summer internship in NTT (Nippon Telegraph and Telephone), Japan, supervised by Dr. Tatsuaki Okamoto; where he invented the construction of PMACX, his first attempt in improving an existing symmetric cryptographic scheme. Before the Ph.D. study program, he graduated from Hong Kong University of Science and Technology (HKUST) with an engineering bachelor degree in Computer Engineering.