The Second-Factor Authentication System at CERN Adeel Ahmad, Asier Aguado Corman, Hannah Short, Liviu Valsan, Maria Fava, Paolo Tedesco, Sebastian Lopienski, Stefan Lueders and Vincent Brillault EPJ Web of Conf., 295 (2024) 04025 Published online: 06 May 2024 DOI: 10.1051/epjconf/202429504025