COLLOQUIUM Department of Computer Science and Engineering University of South Carolina Group Key Agreement: Theory and Practice Yongdae Kim Department of Computer Science University of Southern California Date: March 7, 2002 (Thursday) Time: 3:30-4:30PM Place: 300 Main B110 Abstract Secure group communication is an increasingly popular research area that has received much attention in recent years. Since most group communication takes place over the wide-open expanse of the Internet, security is a major concern. The fundamental security challenge revolves around secure and efficient group key management. Centralized key management methods (key distribution) are appropriate for 2-party (e.g., client-server or peer-to-peer) communication as well as for large multicast groups. However, many collaborative group settings require distributed key management techniques. My work focuses on secure and efficient distributed group key management techniques for secure group communication system. The contribution of my work is four-fold: 1) design of two novel distributed key management techniques, 2) rigorous proof of security, 3) implementation and integration with a reliable group communication system, and 4) performance evaluation and experiments. In this talk, I will touch upon all four aspects of this work. Yongdae Kim is a Ph.D. candidate in the Computer Science at the University of Southern California. He is currently a visiting researcher at the University of California at Irvine. He earned his Bachelor's and Master's degree in Mathematics from Yonsei University in Seoul, Korea. Yongdae Kim's main research interests are network security and applied cryptography.