IC card

Details IC card IC card

1989-07-31

1992-10-27

MacDonald, Allen R.

Registers

Records

Conductive

235380, 235382, 364DIG1, 3642328, 364286, 3642864, 3642865, G06K 502, G06K 903

Patent

active

051591839

ABSTRACT:
An intrinsic cipher code peculiar to each IC card is written and stored in EEPROM serving as a writable non-volatile memory in an IC card, as well as a routine for performing collation with the intrinsic cipher code before a test program is executed being stored in a read-only memory as to allow access to the test program when agreement is established. An attempt can thus be made to improve security for access to the test program.

REFERENCES:
patent: 4709136 (1987-11-01), Watanabe
patent: 4777355 (1988-10-01), Takahira
patent: 4801787 (1989-01-01), Suzuki
patent: 4849614 (1989-07-01), Watanabe et al.
patent: 4885788 (1989-12-01), Takaragi et al.
patent: 5016212 (1991-05-01), Yamaguchi et al.
patent: 5039850 (1991-08-01), Yamaguchi

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