Security card and a computer system provided with an interface for reading a security card
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jun 10, 2003
Grant Date -
N/A
app pub date -
Sep 15, 2000
filing date -
Sep 17, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A security card 20 including a CPU 1 for executing instruction sequences such as a password verifying routine, a memory 2 configured to store secret data such as the password and so forth, a random signal generation circuit 4 configured to generate a wait signal which is output in order to halt the operation of the CPU 1. When the wait signal is input, the CPU 1 halts its operation for a short time such as one to several clocks. In accordance with the security card 20, the operation of the CPU 1 can be deferred for a short time in an arbitrary timing in order to make it difficult to analyze the operation of the CPU 1.
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