<p>This book constitutes the proceedings of the 21st Nordic Conference on Secure IT Systems, held in Oulu, Finland, in November 2016. </p>

<p>The 16 full papers presented in this volume were carefully reviewed and selected from 43 submissions.</p><p>The focus of the conference is on following topics:&nbsp;Security,&nbsp;System Security,&nbsp;Network Security,&nbsp;Software Security, and Information Security.<data security,&nbsp;mobile="" security,&nbsp;security="" protocols,&nbsp;risk="" management,&nbsp;security="" models,="" and&nbsp;vulnerability="" management.</p>