This book constitutes the proceedings of the 17th International Conference on Risks and Security of Internet and Systems, CRiSIS 2022, which took place in Sousse, Tunesia, during December 7-9, 2022. The 14full papers and 4 short papers included in this volume were carefully reviewed and selected from 39 submissions. The papers detail security issues in internet-related applications, networks and systems.

This book constitutes the proceedings of the 17th International Conference on Risks and Security of Internet and Systems, CRiSIS 2021, which took place during November 11-13, 2021. The conference was originally planned to take place in Ames, IA, USA, but had to change to an online format due to the COVID-19 pandemic. The 9 full and 3 short papers included in this volume were carefully reviewed and selected from 23 submissions. The papers were organized in topical sections named: CPS and hardware security; attacks, responses, and security management; network and data security.

This book constitutes the revised selected papers from the 14th International Conference on Risks and Security of Internet and Systems, CRiSIS 2019, held in Hammamet, Tunisia, in October 2019. The 20 full papers and 4 short papers presented in this volume were carefully reviewed and selected from 64 submissions. They cover diverse research themes that range from classic topics, such as risk analysis and management; access control and permission; secure embedded systems; network and cloud security; information security policy; data protection and machine learning for security; distributed detection system and blockchain.

This open access book constitutes the refereed proceedings of the 18th International Conference on String Processing and Information Retrieval, ICOST 2020, held in Hammamet, Tunisia, in June 2020.* The 17 full papers and 23 short papers presented in this volume were carefully reviewed and selected from 49 submissions. They cover topics such as: IoT and AI solutions for e-health; biomedical and health informatics; behavior and activity monitoring; behavior and activity monitoring; and wellbeing technology. *This conference was held virtually due to the COVID-19 pandemic.