This book constitutes the proceedings of the satellite workshops held around the 19th International Conference on Applied Cryptography and Network Security, ACNS 2021, held in Kamakura, Japan, in June 2021.The 26 papers presented in this volume were carefully reviewed and selected from 49 submissions. They stem from the following workshops:   AIBlock 2021: Third International Workshop on Application Intelligence and Blockchain Security   AIHWS 2021: Second International Workshop on Artificial Intelligence in Hardware Security   AIoTS 2021: Third International Workshop on Artificial Intelligence and Industrial IoT Security   CIMSS 2021: First International Workshop on Critical Infrastructure and Manufacturing System Security Cloud S&P 2021: Third International Workshop on Cloud Security and Privacy   SCI 2021: Second International Workshop on Secure Cryptographic Implementation   SecMT 2021: Second International Workshop on Security in Mobile Technologies   SiMLA 2021; Third International Workshop on Security in Machine Learning and its ApplicationsDue to the Corona pandemic the workshop was held as a virtual event.