Postbank wants to put a stop to Internet fraud. In recent months, wave after wave of criminals have tried to obtain transaction numbers (TAN) from those doing online banking. A stop is to be put to this. As the first large bank, Postbank is introducing the so-called indexed transaction number (iTAN). It has the following advantage. Previously the bank accepted any TAN from the list. As of now, it requires the customer to use a specific TAN. Even if the fraudster obtains this iTAN, it is without value. For the bank computer demands another iTAN the next time an online booking is made. Of course, Postbank customers may still not divulge their data should fraudsters ask them to do so. Banks never request customers to enter personal data on an unsecure site. What is more, Postbank urges the deployment of virus scanners and a firewall, as well as the use of operating system updates to prevent Trojans.
http://www.postbank.com/pbcom_ag_home/pbcom_pr_press/pbcom_p...


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Note added at 26 mins (2008-03-06 15:45:56 GMT)
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In addition, two new types of TAN (transaction number) have made online banking with Postbank even safer: indexed and mobile TANs. In the indexed TAN procedure, which has been offered by Postbank since August 2005, the bank’s system requests a specific TAN from the customer. The customer can only perform an online transaction by entering the correct TAN from the list provided.

http://www.postbank.com/pbcom_ag_home/pbcom_pr_press/pbcom_p...