The TAN generator for the optical TAN procedure, which is also known as chipTAN comfort or Sm@rt-TAN plus/Sm@rtTAN optic. Before generating a TAN, you can always check the transaction data on the display of the TAN generator. This procedure is therefore just as secure as the TANs generated by the bank card, and the TANs generated by the TAN generator always have an unbreakable link to your single payment order, for instance. This prevents an attacker from misusing your TANs for other bank transfers.