| Sumario: | As general and program chairs, it is our great pleasure to welcome you to the 2021 ACM Workshop on Information Hiding, Multimedia and Security - IH&MMSec'21. In usual times, the conference should have been held at the Royal Military Academy in Brussels, Belgium. However, due to the situation of the Covid-19 pandemic, this year again, the conference will be virtual. Let us hope that it is the very last time! Nevertheless, this year's workshop continues its tradition of being the premier forum for presentation of research results on leading edge issues of multimedia security such as hidden communications, multimedia forensics, data protection, biometrics, security of multimedia recognition systems, as well as topics in privacy, policy and legal issues in relation to multimedia security and forensics in real world applications. We expect the workshop to facilitate cross-fertilization of ideas among key stakeholders from academia, industry, practitioners, and government agencies around the globe. The call for papers attracted 47 submissions from countries around the world. The program committee accepted 22 papers that cover a wide variety of topics mentioned above. In addition, the program includes three keynote talks focused on information leakages: one dedicated to side-channels attacks by Francois-Xavier Standaert (UCL, Belgium), one on privacy issues in machine learning by Nicolas Carlini (Google Brain), and one on watermarking to monitor data used during training by Alexandre Sablayrolles (FaceBook). We hope that both the live presentations and the proceedings will serve as a valuable reference for security researchers and developers.
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