Overview: The 5th International Conference on Information Security Practice and Expe- ence (ISPEC 2009) was held in Xi’an, China, April 13–15, 2009. The ISPEC conference series is an established forum that brings together - searchers and practitioners to provide a con?uence of new information security technologies, including their applications and their integration with IT systems in various vertical sectors. In previous years, ISPEC has taken place in Sin- pore (2005), Hangzhou, China (2006), Hong Kong, China (2007), and Sydney, Australia (2008). For all sessions, as this one, the conference
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