Transaction authentication number

ChipTAN generator (optical version) with bank card attached. The two white arrows mark the borders of the barcode on the computer screen. Tan}} A transaction authentication number (TAN) is used by some online banking services as a form of ''single use'' one-time passwords (OTPs) to authorize financial transactions. TANs are a second layer of security above and beyond the traditional single-password 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. Conversely, if the login data are obtained, no transactions can be performed without a valid TAN. Provided by Wikipedia

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