This volume contains the proceedings of the 4th International Conference on - formation and Communications Security (ICICS2002). The three previous c- ferenceswereheldinBeijing(ICICS97), Sydney(ICICS99)andXian(ICICS01), where we had an enthusiastic and well-attended event. ICICS2002 is sponsored and organized by the Laboratories for Information Technology, Singapore, in co-operation with the Engineering Research Center for Information Security Technology of the Chinese Academy of Sciences and the International C- munications and Information Security Association (ICISA). During the past ?ve...