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Trans­ac­tion number (TAN)

This is a kind of one-off pass­word which is used in addi­tion to a pass­word or PIN. TANs can be gen­er­ated and dis­played to users in dif­ferent ways - e. g. mobile TANs (mTAN) which is trans­mitted by finan­cial insti­tu­tions to users via a SMS, or photo TANs, which are dis­played after decrypting a coloured mosaic pattern.

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