International Conference on Computational Intelligence and Security (CIS) is a major annual international conference to bring together researchers, engineers, developers and practitioners from academia and industry working in all areas of two crucial fields in information processing: computational intelligence (CI) and information security (IS), to share the experience, and exchange and cross-fertilize ideas. In particular, the series of CIS conference provides an ideal platform to explore the potential applications of CI models, algorithms and technologies to IS. Following the great success of CIS'2005, CIS'2006, and CIS'2007, CIS'2008 serves as a forum for the dissemination of state-of-the-art research, development, and implementations of systems, technologies and applications in these two broad fields. CIS’2008 is co-organized by Southeast University and Soochow University. Also, it is co-sponsored by Guangdong University of Technology, Xidian University, and Harbin Institute of Technology, and in cooperation with IEEE Nanjing Section and IEEE (Hong Kong) Computational Intelligence Chapter.