5th CCS 1998 Message from the General Chair As the general chair, I would like to extend to you a warm welcome to the Fifth ACM Conference on Computer and Communications Security (CCS-5). After visiting New Delhi, India and Zurich, Switzerland in the previous two years, this flagship security conference sponsored by ACM SIGSAC comes to the beautiful city of San Francisco, California. The conference is hosted at the splendid Fairmont Hotel at the top of the exclusive Nob Hill area, and I hope you enjoy the conference program as well as the cultural and artistic surroundings. Once again we have a very strong technical program, with technical sessions on group key management, anonymity, mobile code security, cryptography, protocol design and analysis, and systems security. We are also fortunate to have distinguished invited speakers who will provide illuminous insights into historical perspectives, the bigger picture of the risks and challenges for the international information infrastructure, and a research agenda the U.S. National Research Council is recommending towards addressing these issues. In addition, we have a full day of tutorials on both fundamental and emerging topic areas in the field of computer security. I would like to thank the program chair, Michael Reiter, the program committee members, the authors, and the speakers, for their hard work that has continued to uphold the high standard that is now custom to this conference series. I also appreciate the effort of the steering committee chair, Ravi Sandhu, who is also the chair of our sponsor ACM SIGSAC. As SIGSAC has recently become a conference-only SIG, and all SIGSAC members will receive CCS proceedings in lieu of the now discontinued newsletter, it becomes more crucial to maintain the leadership position of our conference. The organization of such a conference is not possible without the help from many people, and I express my gratitude to Heather Levell, our conference program director at ACM, Shyh-Wei Luan, local arrangement chair, Jacques Stern, the awards chair, Stuart Stubblebine, the publications chair, Gene Tsudik, publicity chair, and the people in my group at Sun Microsystems who are very helpful with registration and other chores. This is the third year in a row that I have been involved with this conference series as either program chair or general chair. During this period, I have the opportunity to work closely with some of the best people in our community, and I benefited greatly from this experience. I wish the best future success for this conference. Now that I am no longer under "paper curfew" (applied to program and general chairs), I am looking forward to once again being able to submit papers! Li Gong General Chair, ACM CCS-5 Distinguished Engineer, Java Software Division, Sun Microsystems Cupertino, California