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内容説明 This book constitutes the refereed proceedings of the 4th International Workshop on Security， IWSEC 2009， held in Toyama， Japan， in October 2009. The 13 revised full papers presented together with 1 invited talk were carefully reviewed and selected from 46 submissions. The papers are organized in topical sections on block cipher， cryptographic protocols， contents protection and intrusion detection， as well as authentication.