The National Institute of Standards and Technology, which publishes guidelines, recently confirmed something security professionals have been saying for a number of years, that SMS is not totally protected.
SMS is really a vulnerable two-factor authentication method, pointed out Michael Lynch, chief strategy officer for Boston-based digital device intelligence company InAuth. "SMS is frequently targeted by fraudsters especially when it is used as some type of one time code or verification."
NIST, the non-regulatory agency of the Commerce Department, specifically singled out risk of SMS when used in 2FA in its latest draft of the Digital Authentication Guideline. NIST stated that SMS messages are vulnerable to interception and redirection. NIST made it clear in a blog that it was not yet banning use of SMS, only discouraging its use. The final guidelines, however, might discourage the use of SMS-based authentication for out-of-band verification
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