On behalf of the Program Committee of the First International Workshop on Information Security (IS 2006), it was our great pleasure to welcome the participants to the IS 2006, held in conjunction with OnTheMove Federated Conferences (OTM 2006), from October 30 to November 1, 2006, in Montpellier, France. In recent years, significant advances in information security have been made throughout the world. The objective of the workshop was to promote information security related research and development activities and to encourage communication between researchers and engineers throughout the world in this area.