Enable/disable method of additional-function unit, system for same, program for same, as well as additional-function unit

摘要

The objective of the present invention is to disable functionality of an additional-function unit if an unauthorized program has been installed in an information processing device, thereby preventing an unauthorized program from acquiring, in an unauthorized manner, information from the additional-function unit. The present invention is an enable/disable method for an additional-function unit in an information processing device to which the additional-function unit has been added, which has a step for calculating a first directional function value on the basis of data included in a recording medium storing a boot loader and an operating system so as to store the first directional function value at manufacture time into the additional-function unit, a step for calculating a second directional function value on the basis of data included in the recording medium after the information processing device has been started up, and a step for disabling the functionality of the additional-function unit if the first directional function value and the second directional function value are different.

主权项

1. A method of validating/invalidating an additional function unit in an information processing apparatus to which the additional function unit is added, the method comprising:
a step of calculating a first one-way function value based on data included in a recording medium that stores a boot loader and an operating system, and storing the first one-way function value in the additional function unit upon manufacturing; a step of calculating a second one-way function value based on the data included in the recording medium after the information processing apparatus is activated; and a step of, when the first one-way function value and the second one-way function value are different, invalidating a function of the additional function unit, wherein the recording medium is provided in the information processing apparatus, the additional function unit is a unit that is added to the information processing apparatus, the information processing apparatus is a payment function mounted handy terminal, and the additional function unit is a PIN (Personal Identification Number) input unit.