This book constitutes the refereed proceedings of the 11th International Conference on Applications and Techniques in Information Security, ATIS 2020, held in Brisbane, QLD, Australia, in November 2020. Due to the COVID-19 pandemic the conference was be held online.

The 8 full papers presented in the volume were carefully reviewed and selected from 24 submissions. The papers are focused on all aspects on techniques and applications in information security research.