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Transaction number (TAN)

A one-time password used to authorize transactions.

What is a TAN?

A transaction authentication number, or TAN, is used by some issuing banks as a kind of single-use one-time password (OTP). It adds a second level of security in Internet banking with so-called “two-factor authentication”. TANs are typically six or eight characters long.

Different TAN delivery approaches

  • TAN lists on paper
  • TAN by text message
  • TAN generator
  • TAN via QR code
Transaction Number

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