Portable electronic apparatus

Details Portable electronic apparatus Portable electronic apparatus

1993-03-04

1995-01-24

Shepperd, John

Registers

Records

Conductive

G06K 1906, G06F 1760

Patent

active

053844548

ABSTRACT:
An IC card has a data memory for storing at least one registration key data and a control element for controlling the data memory and is adapted to receive key data, as collation data, from an outside, collate it with the registration key data stored in the data memory, hold a result of collation in a holding section such as a RAM, and determine whether or not a subsequent access instruction be executed for the data memory. A present system above includes a unit, responsive to instruction data input from the outside, for internally clearing the collation result of the key data. As a result, the collation result of the key data is not held at all times during a power supply. It is thus possible to prevent any unauthorized access to an IC card data by an unauthorized person during the power supply and to structure a flexible system.

REFERENCES:
patent: 4734568 (1988-03-01), Watanabe
patent: 4734569 (1988-03-01), Kawana et al.
patent: 4816653 (1989-03-01), Anderl et al.
patent: 4853522 (1989-08-01), Ogasawara
patent: 4891506 (1990-01-01), Yoshimatsu
patent: 4928001 (1990-05-01), Masada
patent: 4985615 (1991-01-01), Iijima
patent: 4988855 (1991-01-01), Iijima

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