2010
- Program Committee, 11th IEEE International Symposium on Policies for Distributed Systems and Networks (POLICY)
- Program Committee, 9th Symposium on Identity and Trust on the Internet (IDtrust)
- Program Committee, 15th ACM symposium on access control models and technologies (SACMAT)
- Program Committee, 19th International World Wide Web Conference (WWW), Security and Privacy Track
- Program Committee, Fourth IFIP WG 11.11 International Conference on Trust Management (IFIPTM)
2009
- Program Committee, 12th Information Security Conference (ISC)
- Program Committee, 14th ACM Symposium on Access Control Models and Technologies (SACMAT)
- Program Committee, Ninth Symposium on Identity and Trust on the Internet (IDtrust)
- Program Committee, Third IFIP WG 11.11 International Conference on Trust Management (IFIPTM)
2008
- Program Committee, Seventh ACM Workshop on Privacy in the Electronic Society (WPES)
2006
- Program committee, Second International Workshop on Cluster Security (Cluster-Sec)