Biographical sketch of author

Pau-Chen Cheng   IBM Research Division, Thomas J. Watson Research Center, P.O. Box 704, Yorktown Heights, New York 10598 (electronic mail: pau@us.ibm.com). Dr. Cheng is a research staff member at the Watson Research Center. He received a B.S.E.E. degree from National Chiao-Tung University, Hsinchu, Taiwan, ROC, in 1982 and a Ph.D. degree in electrical engineering from the University of Maryland in 1990. He joined the Computing System Department of the Research Center in 1990 to work on the development of security functions of AIX. In 1994 he joined the Network Security Group in Research to work on IP Security technology. He is the principal developer of the IPSec and VPN technology on the AIX operating system. His areas of interest are in the system aspects of computer and network security. He has been involved in the design and implementation of solutions for data encryption and authentication, key management, user authentication, and Internet security.