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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]].
TANs provide additional security because they act as a form of ''two-factor authentication'' (2FA). If the physical document or token containing the TANs is stolen, it will be useless without the password
==Classic TAN==
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