NIST Denounces SMS 2FA – What are the Alternatives?
Towards the end of July 2016, the National Institute of Standards and Technology (NIST) started the process of deprecating the use of SMS-based out-of-band authentication. This became clear in the issue of the DRAFT NIST Special Publication 800-63B, Digital Authentication Guideline.
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Story added 17. August 2016, content source with full text you can find at link above.