Book excerpt: This book is a collection of high-quality peer-reviewed research papers presented at the Ninth International Conference on Cyber-Security, Privacy in Communication Networks (ICCS 2023) held at Cardiff School of Technologies, Cardiff Metropolitan University, Cardiff, UK, during 11–12 December 2023. This book presents recent innovations in the field of cyber-security and privacy in communication networks in addition to cutting edge research in the field of next-generation communication networks.