Eko Hari Rachmawanto received a Bachelor’s degree at the Department of Informatics Engineering Universitas Dian Nuswantoro, Semarang, Indonesia, in 2009 and a dual Master’s degree in the Department of Informatics Engineering, Universitas Dian Nuswantoro, Semarang, Indonesia and in Faculty of Computer Science and Information, Universiti Teknikal Malaysia Melaka, Melaka, Malaysia, in 2012. He is currently the lecturer and researcher at the Faculty of Computer Science, Universitas Dian Nuswantoro, Semarang, Indonesia. He has authored or co-authored more than 100 refereed journal and conference papers. He is also a reviewer of more than 10 Scopus-indexed journals indexed by Scopus. His research interests include image processing, especially data hiding, cryptography, image processing, machine learning, and deep learning. He can be contacted at email: eko.hari@dsn.dinus.ac.id.