This book constitutes the refereed proceedings of the 25th International Conference on Information Security Applications, WISA 2024, held in Jeju Island, South Korea, during August 21-23, 2024. The 28 full papers included in this book were carefully reviewed and selected from 87 submissions. They were organized in topical sections as follows: Cryptography; Network Security; AI Security 1; Network & Application Security; AI Security 2; CPS Security; Fuzzing; Malware; Software Security; and Emerging Topic.