Hitachi Ulsi Systems Co., Ltd.

Hitachi, Ltd.

Renesas Electronics Corporation

Renesas Technology Corp.

Hiroshi Watase

Takashi Tsukamoto

Kunihiko Nakada

Nobutaka Nagasaki

Yuuichirou Nariyoshi

Masatoshi Takahashi

Toshihiro Tanaka

Takashi Endo

Yutaka Shinagawa

Kozo Katayama

Masaru Ohki

Takanori Yamazoe

Yasuko Fukuzawa

Masahiro Kaminaga

Takeo Kanai

Chiaki Tanimoto

Satoshi Taira

Shigeo Hirabayashi

Chiaki Terauchi

Masaru c/o Hitachi Ltd Int Prop Gp Ohki

Masahiro c/o Hitachi Ltd Int Prop Gp Kaminaga

Takashi c/o Hitachi Ltd Int Prop Gp Endo

Chiaki c/o Hitachi Ltd Int Prop Gp Terauchi

Yasuko c/o Hitachi Ltd Int Prop Gp Fukuzawa

Kunihiko c/o Hitachi Ltd Int Prop Gp Nakada

A semiconductor processing device according to the invention includes a first non-volatile memory () for erasing stored information on a first data length unit, a second non-volatile memory () for erasing stored information on a second data length unit, and a central processing unit (), and capable of inputting/outputting encrypted data from/to an outside. The first non-volatile memory is used for storing an encryption key to be utilized for encrypting the data. The second non-volatile memory is used for storing a program to be processed by the central processing unit. The non-volatile memories to be utilized for storing the program and for storing the encryption key are separated from each other, and the data lengths of the erase units of information to be stored in the non-volatile memories are defined separately. Therefore, the stored information can efficiently be erased before the execution of a processing of writing the program, and the stored information can be erased corresponding to the data length of a necessary processing unit in the write of the encryption key to be utilized in the calculation processing of the CPU.

Semiconductor processing device and IC card

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.

Information processing device, card device and information processing system

Disclosed herein are an IC card and a microcomputer which have implemented the strengthening of security and the speeding up and enhancement of signal processing for the security. In an IC card, which is supplied with an operating voltage by an electrical connection between each of external terminals and a read/write device, and includes an input-output operation of data with an encoding process or a decoding process, a disturbance-aimed processing operation is included in the encoding process or decoding process to uniformalize timings provided to operate an internal circuit and its operating current. In a microcomputer having a module configuration including an input-output operation of data with an encoding process or a decoding process, a disturbance-aimed processing operation is included in the encoding process or decoding process to uniformalize timings provided to operate an internal circuit and its operating current.

IC card and microprocessor

Growing community of inventors

Kodaira, Japan

Hiroshi Watase