Title	Semantic Relation Based Exception Detection in Workflow Systems
Author	Li Hai-bo, Zhan De-chen, Xu Xiao-fei
Citation	Vol. 6  No. 2  pp. 160~165
Keywords	workflow, exception detection, semantic relation, data dependency rule, control rule

Title	Efficient Multi-proxy Multi-Signature Schemes Based on DLP
Author	Ya-Fen Chang, Chin-Chen Chang
Citation	Vol. 6  No. 2  pp. 152~159
Keywords	Proxy-signature, multi-signature, DLP

Title	A Lossless Watermarking Scheme for Halftone Image Authentication
Author	Jeng-Shyang Pan, Hao Luo, Zhe-Ming Lu
Citation	Vol. 6  No. 2  pp. 147~151
Keywords	Halftone image, Lossless watermarking, Hash sequence, Image authentication

Title	Comparison of Security Patterns
Author	David G. Rosado, Eduardo Fern?ndez-Medina, Mario Piattini
Citation	Vol. 6  No. 2  pp. 139~146
Keywords	Security, Security Patterns, Security Architecture