Malicious SS7 activity and why SMS should never by used for 2FA

John Levine johnl at
Mon Apr 19 18:11:18 UTC 2021

It appears that William Herrin <bill at> said:
>> If a key fob can be sent to them - preferably for free - that would help.
>Hint: carrying around a separate hardware fob for each important
>Internet-based service is a non-starter. Users might do it for their
>one or two most important services but yours isn't one of them.

You think?


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