This book constitutes the refereed post-conference proceedings of the 23rd International Conference on Information Security, ISSA 2024, held in Gqeberha, South Africa, during December 2-3, 2024.The 21 full papers presented were carefully reviewed and selected from 55 submissions. The papers focus on topics such as Cyber security; Information Security; Network Security; Computer Security; Digital Forensics; Botnets; Security in Cloud Computing; ChatBot security; Insider Threats; NIDS; GANs and Malware; Privacy; Cyber security Education; Cyber security & AI; Digital Forensics & AI.