Acrónimo: TAN
Número
singular que sólo se utiliza una vez para identificar una transacción y
autenticarla.
A Transaction
authentication number, TAN or T.A.N. is used by some online banking services as
a form of single use one-time passwords to authorize financial transactions.
TANs are a second layer of security above and beyond the traditional
single-password authentication.
TANs are believed
to provide additional security because they act as a form of two-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 TAN.
http://en.wikipedia.org/wiki/Transaction_authentication_number
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