Foundations and practice of security : 15th International Symposium FPS 2022 Ottawa ON Canada December 12 14 2022 : revised selected papers This book constitutes the refereed proceedings of the 15th International Symposium on Foundations and Practice of Security FPS 2022 held in Ottawa ON Canada during December 12 14 2022. The 26 regular and 3 short papers presented in this book were carefully reviewed and selected from 83 submissions. The papers have been organized in the following topical sections: Cryptography; Machine Learning; Cybercrime and Privacy; Physical layer Security; Blockchain; IoT and Security Protocols; and Short Papers