Within the framework of the execution of the general culture conference program, for the year 2020-2021, for the benefit of the executives of the Air Force Command, Doctor KERAR Younes animated on April 21^st, 2021 at the Headquarters of the Air Force Command / Chahid AIT-HAMOUDA Amirouche, a conference entitled:" The Bloc Chain : Its definition and its function in securing digital transformation ".