Secure IT Systems

This book constitutes the refereed proceedings on the 23rd Nordic Conference on Secure IT Systems, NordSec 2018, held in Oslo, Norway, in November 2018.The 29 full papers presented in this volume were carefully reviewed and selected from 81 submissions. They are organized in topical sections named: privacy; cryptography; network and cloud security; cyber security and malware; and security for software and software development.