Electronic key with multiple password protected sub-keys using a

Details Electronic key with multiple password protected sub-keys using a Electronic key with multiple password protected sub-keys using a

Filed on

1990-11-19

Date issued

1993-07-06

Examiner

Lee, Thomas C.

Patent Class

Boots, shoes, and leggings

Other Related Categories

364DIG1, 3642452, 3642469, 3642603, G06F 1202, G06F 1214

Type

Patent

Status

active

Patent number

052261379

Description

ABSTRACT:
An electronic key integrated circuit which includes three independently addressable partitions of secure memory. Each of these three partitions can function as a separate "subkey." Each of the subkeys is independently password-protected.
In addition to the secure subkey memory partitions, the integrated circuit also contains a read/write "scratchpad" memory, which is the same size as each of the subkeys. After data has been written into the scratchpad (and verified if desired), it can be copied, as a block, onto one of the subkey partitions. However, to perform such a block move the password of the target subkey must also be specified.

REFERENCES:
patent: 4211919 (1980-07-01), Ugon
patent: 4683372 (1987-07-01), Matsumoto
patent: 4742215 (1988-05-01), Daughters et al.
patent: 4862501 (1989-08-01), Kamitake et al.
patent: 4882474 (1989-11-01), Anderl et al.
patent: 4885788 (1989-12-01), Takaragi et al.
patent: 4887234 (1989-12-01), Iijima
patent: 4928001 (1990-05-01), Masada

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