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Line 1: ~~{{merge to\|One-time password\|date=December 2020}}~~ A '''transaction authentication number''' ('''TAN''') is used by some [[online banking]] services as a form of ''single use'' [[one-time password]]s (OTPs) to authorize [[financial transaction]]s. TANs are a second layer of security above and beyond the traditional single-password [[Authentication protocol\|authentication]].

Transaction authentication number: Difference between revisions