Cryptology and Network Security

This book constitutes the refereed proceedings of the 20^th International Conference on Cryptology and Network Security, CANS 2021, which was held during December 13-15, 2021. The conference was originally planned to take place in Vienna, Austria, and changed to an online event due to the COVID-19 pandemic.

The 25 full and 3 short papers presented in these proceedings were carefully reviewed and sel...