This book constitutes the refereed proceedings of the International Workshop on Intelligence and Security Informatics, WISI 2006, held in Singapore in conjunction with the 10th Pacific-Asia Conference on Knowledge Discovery and Data Mining. The 32 papers presented together with the abstract of the keynote talk were carefully reviewed. The papers are organized in sections on Web and text mining for terrorism informatics, cybercrime analysis, network security, and crime data mining.

Keynote Speech.- Data Mining for Security Applications.- Web and Text Mining for Terrorism Informatics.- Unraveling International Terrorist Groups' Exploitation of the Web: Technical Sophistication, Media Richness, and Web Interactivity.- Multi-lingual Detection of Terrorist Content on the Web.- INEXT: An Investigative Search Tool for Knowledge Extraction.- Cybercrime Analysis.- Cybercrime in Taiwan - An Analysis of Suspect Records.- Analysis of Computer Crime Characteristics in Taiwan.- A Cross Datasets Referring Outlier Detection Model Applied to Suspicious Financial Transaction Discrimination.- Network Security.- Detecting Novel Network Attacks with a Data Field.- Improving Authentication Accuracy of Unfamiliar Passwords with Pauses and Cues for Keystroke Dynamics-Based Authentication.- Illegal Intrusion Detection Based on Hidden Information Database.- Defender Personality Traits.- Crime Data Mining.- Mining Criminal Databases to Finding Investigation Clues-By Example of Stolen Automobiles Database.- Country Corruption Analysis with Self Organizing Maps and Support Vector Machines.- Temporal Representation in Spike Detection of Sparse Personal Identity Streams.- Mining Positive Associations of Urban Criminal Activities Using Hierarchical Crime Hot Spots.- VCCM Mining: Mining Virtual Community Core Members Based on Gene Expression Programming.- Posters.- Integration of a Cryptographic File System and Access Control.- Applications of Homomorphic Functions to Software Obfuscation.- Security Model for Informational Privacy.- A Viable System for Tracing Illegal Users of Video.- Privacy and Security Enhanced Offline Oblivious Transfer for Massive Data Distribution.- The Effectiveness of Artificial Rhythms and Cues in Keystroke Dynamics Based User Authentication.-Cascade Damage Estimation Model for Internet Attacks.- A New Secure Key Exchange Protocol Between STB and Smart Card in DTV Broadcasting.- A Fuzzy Anomaly Detection System.- Hidden Markov Model Based Intrusion Detection.- One-Class Strategies for Security Information Detection.- Design of an Emergency Prediction and Prevention Platform for Societal Security Decision Support Using Neural Networks.- A Novel Identity Authentication Technique Without Trustworthy Third-Party Based on Fingerprint Verification.- Cyberspace Community Analysis and Simulation Using Complex Dynamic Social Networks.- Analysis of Infectious Disease Data Based on Evolutionary Computation.- Rule+Exception Learning-Based Class Specification and Labeling in Intelligence and Security Analysis.- A Computational Framework for Decision Analysis and Support in ISI: Artificial Societies, Computational Experiments, and Parallel Systems.