!!! Overview
[{$pagename}] ([TAN]) is used by some online banking services as a form of single use [One-Time password]s to authorize financial transactions. 

[{$pagename}]s provide additional security because they act as a form of [Multi-Factor Authentication]. Should the physical document or token containing the TANs be stolen, it will be of little use without the [password]; conversely, if the login data are obtained, no transactions can be performed without a valid [{$pagename}].

Originally, [{$pagename}]s were printed on a piece of paper and handed by the bank personnel to the end user. Now there are many different methods used for providing [{$pagename}]s.

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [Transaction authentication number|https://en.wikipedia.org/wiki/Transaction_authentication_number|target='_blank'] - based on information obtained 2015-10-30