Method for controlling memory access on a chip card and apparatu

Details Method for controlling memory access on a chip card and apparatu Method for controlling memory access on a chip card and apparatu

1986-07-07

1989-04-04

Shaw, Gareth D.

Boots, shoes, and leggings

365218, 235380, 235487, G06F 1134, G11C 1140, G06K 500

Patent

active

048192040

ABSTRACT:
A method for controlling memory access to a user area and an initial code area of a main memory of a chip card includes carrying out an internal release procedure with a data comparison of an initial code from the initial code area and a data word from a terminal; firmly coupling addresses of the main memory and of a control memory to each other; marking several storage locations of the main memory as the initial code area with one control bit at a time in the control memory; marking a first code deposited in the associated storage location of the first code area as activated or deactivated with one further control bit at a time in the control memory; generating an initial release signal in a release procedure only if a storage location is addressed by an activated initial code and if agreement with the data word entered by the terminal prevails; and preventing generation of the initial release signal if a deactivated code word is addressed and/or if the respective first code does not agree with the data word, and an apparatus for carrying out the method.

REFERENCES:
patent: 4105156 (1978-08-01), Dethloff
patent: 4204113 (1980-05-01), Giraud et al.
patent: 4211919 (1980-07-01), Ugon
patent: 4572946 (1986-02-01), Schrenk
patent: 4648076 (1987-03-01), Schrenk
patent: 4680736 (1987-07-01), Schrenk
patent: 4712177 (1987-12-01), Schrenk
patent: 4746788 (1988-05-01), Kawana
patent: 4749982 (1988-06-01), Rikuna et al.
Betriebspraxis, vol. 31, Issue Feb. 1982, pp. 48-53, "The Chip Card Next Generation of Automation Card".

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