Intelligence and Security Informatics: Pacific Asia Workshop, PAISI 2007, Chengdu, China, April 11-12, 2007This book constitutes the refereed proceedings of the Pacific Asia Workshop on Intelligence and Security Informatics, PAISI 2007, held in Chengdu, China in April 2007.The 18 revised full papers, 14 revised short papers, and extended abstracts of 10 poster papers presented were carefully reviewed and selected from 159 submissions. The papers are organized in topical sections on crime analysis, emergency response and surveillance, intrusion detection, network security, data and text mining, cybercrime and information access and security, intrusion detection, network security, terrorism informatics and crime analysis, network security and intrusion detection.