OTPs in the context of online banking
In some countries OTPs that are used in the context of online banking. In some of these systems, the bank sends to the user a numbered list of OTPs that are printed on paper. For every online transaction, the user is required to enter a specific OTP from that list. In Germany, those OTPs are typically ca
lled TANs (for 'transaction authentication numbers'). Some banks even dispatch such TANs to the user's mobile phone via SMS, in which case they are called mTANs (for 'mobile TANs').
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