The 10th International Workshop on Information Security Applications (WISA 2009) was held in Busan, Korea during August 25-27, 2009. The workshop was hosted by the Korea Institute of Information Security and Cryptology (KIISC), supported by the Electronics and Telecommunications Research Institute (ETRI) and the Korea Internet and Security Agency (KISA), sponsored by the Ministry of Public Administration and Security (MoPAS) and the Korea Communications Commission (KCC), financially sponsored by the ST. Ltd. The aim of the workshop was to serve as a forum for presenting new research and...