Process circuit & system for protecting an integrated circuit against fraudulent use
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United States of America Patent
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-
Apr 14, 1998
Grant Date -
N/A
app pub date -
Jul 14, 1993
filing date -
Feb 19, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process to protect against tampering with integrated circuits. During manufacture, a secret code is written in a secret address (102) of a memory (101) of the integrated circuit and an internal logic (103-108) blocks writing into this portion of memory, the testing of the integrated circuit and the read-out of data. In order to unlock the integrated circuit, the secret address is read while applying a secret code to an input of the integrated circuit. A comparison (207) of the secret code as read and the secret code applied to the integrated circuit then either locks or unlocks the integrated circuit. This unlocking is done in irreversible manner. Thus, it is possible to transport integrated circuits between a manufacturer and a remote users, without fear of the circuits being stolen, because if stolen, they would be inoperable without the secret codes.
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