IC card for prevention of fraudulent use

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5286962
SERIAL NO

07795764

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Disclosed herein is an IC card provided with means for generating a first signal indicating execution to a test program and a logic circuit for receiving the first signal and a second signal for commanding data writing in the prescribed region of the memory. The logic circuit allows output of the second signal during execution of the test program, and inhibits such output of the second signal ween an application program is executed. The IC card is so structured that a prescribed region of a memory is brought into read-only state during execution of an application program so that the IC card is identified with read data, thereby preventing fraudulent use of the IC card.

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Patent Owner(s)

Patent OwnerAddress
RENESAS ELECTRONICS CORPORATION2-24 TOYOSU 3-CHOME KOTO-KU TOKYO 135-0061

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujioka, Shuzo Itami, JP 32 1100
Takahira, Kenichi Itami, JP 26 1511

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