Jooyoung Lee is an Associate Professor at School of Computing, KAIST. He received his Ph.D. degree in cryptography from University of Waterloo in 2005. He is a Professor at School of Computing, KAIST since 2016. His research interests are in cryptography and combinatorics. Recently, he is working on provable security in symmetric cryptography such as block ciphers, modes of operation, hash functions and message authentication codes.