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内容説明 This book constitutes the thoroughly refereed post-proceedings of the 7th International Symposium on Privacy Enhancing Technologies， PET 2007， held in Ottawa， Canada， in June 2007 in conjunction with WOTE 2007， the IAVoSS Workshop on Trustworthy Elections. The 16 revised full papers presented were carefully selected from 84 submissions during two rounds of reviewing and improvement. The papers - both from academia and industry - cover design and realization of privacy services for the internet and other communication networks and present novel research on all theoretical and practical aspects of privacy technologies， as well as experimental studies of fielded systems.