authentication is a security process in which the
user provides two means of identification, one of
which is typically a physical token, such as a card,
and the other of which is typically something memorized,
such as a security code. In this context, the two
factors involved are sometimes spoken of as something
you have and something you know.A common example
of two-factor authentication
is a bank card: the card itself is the physical
item and the personal identification number (PIN)
is the data that goes with it.
to proponents, two-factor authentication could drastically
reduce the incidence of online identity
theft, and other online fraud, because the victim's
password would no longer be enough to give a thief
access to their information.