Thisbook constitutes the proceedings of the 20th Nordic Conference on Secure ITSystems, held in Stockholm, Sweden, in October 2015.

The11 full papers presented together with 5 short papers in this volume werecarefully reviewed and selected from 38 submissions. They are organized in topicalsections named: cyber-physical systems security, privacy, cryptography, trustand fraud, and network and software security.

Thisbook constitutes the proceedings of the 20th Nordic Conference on Secure ITSystems, held in Stockholm, Sweden, in October 2015.

The11 full papers presented together with 5 short papers in this volume werecarefully reviewed and selected from 38 submissions. They are organized in topicalsections named: cyber-physical systems security, privacy, cryptography, trustand fraud, and network and software security.