Portable information processor having password code checking...

Details Portable information processor having password code checking... Portable information processor having password code checking...

2008-01-29

2008-01-29

Moazzami, Nasser (Department: 2136)

Electrical computers and digital processing systems: support

System access control based on user identification by...

Using record or token

C726S019000, C713S170000

Reexamination Certificate

active

07325144

ABSTRACT:
Switching between a requiring mode and a non-requiring mode of password code checking is enabled by an IC card with a CPU for accessing an EEPROM. The general data in the EEPROM are stored upon attachment of error check codes. The memory area of EEPROM is partitioned into unit areas of 2-byte length and writing is performed according to unit areas. The MSB of a specific unit area Ux is used as a checking requirement flag with “1” being defined as checking “required” and “0” being defined as checking “not required”. In rewriting the checking requirement flag, an erasure process sets all bits in the unit area Ux to “1” and thereafter the desired flag is set in the MSB.

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