Unlock Your Brain, Harden Your System, the wildest digital security event ! Jointly organized by La Cantine numérique and Diateam, UYHYBS23 taked place on November 3rd and 4th in Brest. These two days of workshops and conferences invite participants to discuss the implications of new technologies in society. The most significant findings on computer network attack and defense, open-source security solutions, and pragmatic real-world security experiences will be presented over two days.