This means the crooks have a common point of compromise for both factors of your 2FA. When you access online services from your smartphone, you’ll usually be running the authenticator app on the same device.SMS codes are just random values sent by the server, so there is no “seed” by which a crook could predict the next one in sequence.
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If a crook can crack the app or the server and recover the secret, they can clone your 2FA codes indefinitely.
This “seed” is combined with the time to generate the 2FA code. Authenticator apps depend on a shared secret that both the app and the server need to store.Authenticator apps work even when you don’t have mobile coverage.The codes depend on the app itself, not on your SIM card. SIM swapping won’t hijack your 2FA codes if you’re using an authenticator app.NIST has declared that the age of SMS-based 2FA is done.Your phone will go dead and theirs will start receiving your calls and messages, including 2FA codes. If they can convince a mobile phone shop that they are you, they can get them to issue a replacement SIM encoded with your phone number. A crook can hijack your SMSes with a SIM swap scam.If someone’s trying to break in to your account, the 2FA messages on your phone are warning that it’s time to investigate (and to change your password). SMS authentication can be a canary in the coal mine.It may be the only option if you don’t have a smartphone. There’s no fussing with downloading an app and going through set up for each account. Learn more The pros and cons of SMS-based codes
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