The 8thPrivacyEnhancing TechnologiesSymposium washeldat the Katholieke Universiteit Leuven during July 23-25,2008.This year completed the transition from workshop to symposium, with a printed proceedings published before the symposium. PETS remains a premier venue for publishing original research on privacy-enhancing technologies. PETS received 48 submissions, each of which wasreviewedbyatleastfourmembersoftheProgramCommittee.Thirteenwere accepted into the program, maintaining the selective and competitive nature of the event. The program also included a keynote address by Stuart Shapiro. A new feature this year was the HotPETs session, designed to balance the desire for rigorous scienti?c quality of the PETS program and the need for a venue to present work that is not yet fully developed. HotPETs accepted s- missions on the hottest, most exciting new ideas and put together an excellent program of presentations. PETS was once again collocated with the IAVoSS Workshop on Trustworthy Elections (WOTE 2008), with a full day of plenary sessions. In addition, three otherprivacy-relatedeventswereheldatK.U.Leuvenduring thesameweek, - abling greater exchange of ideas among the respective communities: the closing event of the Privacy and Identity Management for Europe (PRIME) project, a workshop presenting the results from the Advanced Applications for Electronic Identity Cards (ADAPID) project, and a working session of the Future of Id- tity in the Information Society (FIDIS) Workpackage 13

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.

This double volume constitutes the thoroughly refereed post-conference proceedings of the 25th International Conference on Financial Cryptography and Data Security, FC 2021, held online due to COVID-19, in March 2021.The 47 revised full papers and 4 short papers together with 3 as Systematization of Knowledge (SoK) papers were carefully selected and reviewed from 223 submissions. The accepted papers were organized according to their topics in 12 sessions: Smart Contracts, Anonymity and Privacy in Cryptocurrencies, Secure Multi-Party Computation, System and Application Security, Zero-Knowledge Proofs, Blockchain Protocols, Payment Channels, Mining, Scaling Blockchains, Authentication and Usability, Measurement, and Cryptography.

This double volume constitutes the thoroughly refereed post-conference proceedings of the 25th International Conference on Financial Cryptography and Data Security, FC 2021, held online due to COVID-19, in March 2021.The 47 revised full papers and 4 short papers together with 3 as Systematization of Knowledge (SoK) papers were carefully selected and reviewed from 223 submissions. The accepted papers were organized according to their topics in 12 sessions: Smart Contracts, Anonymity and Privacy in Cryptocurrencies, Secure Multi-Party Computation, System and Application Security, Zero-Knowledge Proofs, Blockchain Protocols, Payment Channels, Mining, Scaling Blockchains, Authentication and Usability, Measurement, and Cryptography.