This book constitutes the thoroughly refereed post-conference proceedings of the 8th International Symposium on Foundations and Practice of Security, FPS 2015, held in Clermont-Ferrand, France, in October 2015. The 12 revised full papers presented together with 8 short papers and 2 keynote talks were carefully reviewed and selected from 58 submissions. The papers are organized in topical sections on RFID, sensors and secure computation; security policies and biometrics; evaluation of protocols and obfuscation security; spam emails, botnets and malware.