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Thumperward (talk | contribs) this isn't a separate topic, it's a minor nomenclature difference |
Thumperward (talk | contribs) retarget merge |
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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]].
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