Nec Platforms, Ltd.

Nec Infrontia Corporation

Tsuyoshi Komiyama

There is provided a handy terminal in which inputting of an application program and of a PIN is executed and a keyboard and a display device are commonly used thus security is secured with a simple system. A card reader control programin the keyboard unit memorydetects an insertion state of a credit card and notifies a detected key code from the keyboard control programto a payment program on the main board. A main CPUcalculates a program hash value provided to the payment program and a program hash value at the time of execution of a payment programand encrypts and decrypts these hash values using a secret key, encrypted key, and public key so that these hash values are not stolen. The main CPUcompares the program hash value provided to the payment programwith the program hash value to be used at the time of the execution of the payment program

Handy terminal and payment method to be used in same

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.

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Kanagawa, Japan

Tsuyoshi Komiyama