The code calculator functions largely in the same way as the code card
for authentication of secure transactions. The difference in the modus operandi
of the code card
and the code calculator is that the calculator never run out of one-time codes. The code card
has no protection from misuse once it falls into the wrong hands, while the code calulator typically asks for a PIN
code before you enter the challenge number
. The code calculator can also be reprogrammed if the code sequence is revealed (If a security breach happens at the central computer system or something). Reprogramming of the device is done at the bank, using standard PC
s and IR
to communicate with the device.
See the code card node for a practical example on how these devices are used.