Data processing device with high security of stored programs

Details Data processing device with high security of stored programs Data processing device with high security of stored programs

1988-02-10

1989-11-07

Shaw, Gareth D.

Boots, shoes, and leggings

235380, 380 4, 380 23, 380 24, 3642252, 3642864, 3642865, 3642866, G06F 1530, G06K 500

Patent

active

048796450

ABSTRACT:
An IC card comprises CPU, PROM for storing programs, and RAM for storing the results of arithmetic operations. PROM stores a table on which the names of specific programs are registered. RAM has execution counters which counts up each time each program is run so that the number of times the specific program is run is memorized. Prior to the running of each program by CPU, it is judged whether or not the program is a specific one. If it is the specific program, the execusion counter counts up. When the count value of the execution counter is above a predetermined value, the running of the specific program is prevented.

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patent: 4558176 (1985-12-01), Arnold et al.
patent: 4583196 (1986-04-01), Koo
patent: 4740890 (1988-04-01), William
Smart Credit Cards: The Answer to Cashless Shopping, European Search Report EP 85 10 3322.

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