US 7,086,087 B1 · Information processing device, card device and information processing system

Abstract

It is a technological object of the present invention to provide an information processing device, a card and a card system that have a high level of security. In order to achieve the object described above, the present invention provides a data processing apparatus comprising at least a first information processing device and a second information processing device connected to the first information processing device by a signal line, the data processing apparatus having a means for changing power consumption on the signal line during transmission of a signal through the signal line in accordance with an actual state of the power consumption that would be observed when the means were not used. Furthermore, the present invention also provides another data processing apparatus comprising at least a first information processing device and a second information processing device connected to the first information processing device by a signal line wherein, between at least either the first information processing device or the second information processing device and the signal line, a signal from the first information processing device or the second information processing device can be encrypted and a signal received from the signal line can be decrypted. In addition, the present invention also provides a further data processing apparatus comprising at least an information processing device, an information memory device and a signal line connected at least to the information processing device wherein at least in an operation to store information into the information memory device, the information is encrypted, and information stored in the information memory device can be decrypted.

Claims10

Dependent claims

A semiconductor chip comprising:

an information processing device;
an information memory device;
an encryption device;
a decryption device;
and
a data bus,
wherein two value information corresponds to two different voltages in the semiconductor chip,
wherein data is transferred from the information processing device to the information memory device through the data bus and stored in the information memory device after the data has been encrypted by the encryption device, and
wherein data read from the information memory device is input into the information processing device through the data bus after the data has been decrypted by the decryption device;
wherein the sum of the amount of power consumed by a charging and discharging device and the amount of power as a current flowing through any signal line of the memory device is fixed by utilizing bits inversion of a digital signal representing the data and supplying the signal to an electrical charge and discharge device;
wherein the signal line is electrically charged and discharged with the encrypted data different from an original data;
and reducing the power consumption.

9 more elements

A semiconductor chip comprising:

an information processing device;
an information memory device;
a first encryption device;
a second encryption device;
a first decryption device;
a second decryption device;
and
a data bus,
wherein two value information corresponds to two different voltages in the semiconductor chip,
wherein data output from the information processing device is encrypted by the first encryption device and output to the data bus,
wherein the data encrypted by the first encryption device is transferred to the first decryption device through the data bus, decrypted by the first decryption device and stored in the memory device,
wherein the data read from the information memory device is encrypted by the second encryption device and output to the data bus, and
wherein the data encrypted by the second encryption device is transferred to the second decryption device through the data bus, decrypted by the second decryption device and input to the information processing device;
wherein the sum of the amount of power consumed by a charging and discharging device and the amount of power as a current flowing through any signal line of the memory device is fixed by utilizing bits inversion of a digital signal representing the data and supplying the signal to an electrical charge and discharge device;
wherein the signal line is electrically charged and discharged with the encrypted data different from an original data;
and reducing the power consumption.

13 more elements

Dependencies are inferred from the claim text.

Information processing device, card device and information processing system

Life of this patent

Information processing device, card device and information processing system

Life of this patent

Abstract

Claims10