This book constitutes the refereed proceedings of the 29th International Conference on Secure IT Systems, NordSec 2024, held in Karlstad, Sweden, during November 6–7, 2024.

The 25 full papers presented in this book were carefully reviewed and selected from 59 submissions. They focus on topics such as: Authentication; Cryptography; Cyber-Physical Systems; Cybersecurity and Policy; LLMs for Security; Formal Verification; Mobile and IoT; Network Security; and Privacy.