A bank sends one-time codes by SMS. Criminals persuade a mobile operator's agent to move a customer's number to a new SIM card and then receive the codes. What is a stronger second factor?
Une banque envoie des codes à usage unique par SMS. Des criminels convainquent un agent d'un opérateur mobile de transférer le numéro d'un client sur une nouvelle carte SIM, puis reçoivent les codes. Quel second facteur est plus robuste ?
Answers
AA longer SMS codeUn code SMS plus long
BAn authenticator app or hardware security keyUne application d'authentification ou une clé de sécurité physique
CSending the same code by email as well as by SMSL'envoi du même code par e-mail en plus du SMS
DUsing the same code every timeL'utilisation du même code à chaque fois
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