Security for a data processing system having multiple distinct program instruction sections
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 25, 1997
Issued Date -
N/A
app pub date -
Jun 14, 1994
filing date -
Feb 1, 1989
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An IC card has a CPU and a memory for storing first and second programs. The CPU executes a plurality of instruction in accordance with the first and second programs. The second program is provided by a card manufacturer. A card issuer, such as bank, provides a first program which operates on the second program. The IC card further includes a supervising device for determining when the instructions in the first program address instructions in the second program. When the second program is addressed during operation of the first program, the CPU is interrupted.
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