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Wikipedia en.wikipedia.org/wiki/National_…
and their own 'About NIST' page
nist.gov/about-nist
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1) SMS can be sent to a VOIP or IP based recipient so it may not actually authenticate possession of a phone. So you access it by something you know (password to the voip/internet account) not something you have (phone).
So the recent drama where some politician disclosed OTP on phone doesn't matter. It can be stolen without your knowledge.
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It also talks of 3-4 Authentication Assurance Levels.I am not sure which one @ceo_uidai @INCIndia @narendramodi intend @UIDAI to achieve
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But first let's try to gauge when Indians started using mobile OTP. This 2008 doc is the earliest RBI doc I found mentioning SMS OTP. If you know it was earlier, do tell. rbi.org.in/Scripts/bs_vie…
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So once we realize all these truths, #BanDigitalElections, get our govt back, we can get rid of this KYC for SIM nonsense.