his book constitutes the refereed proceedings of the Third International Conference on Advances in Information Security and Its Applications, ISA 2009, held in Seoul, Korea, in June 2009.

The 16 revised full papers presented were carefully reviewed and selected from 137 submissions. The volume presents recent progress in the area of communication and networking including modeling, simulation and novel applications associated with the utilization and acceptance of computing devices and systems. The papers are organized in topical sections on information assurance and its application; security protocol and its application, other security research.