Data processing: financial – business practice – management – or co – Business processing using cryptography – Secure transaction
Reexamination Certificate
2011-08-02
2011-08-02
Nguyen, Nga B. (Department: 3684)
Data processing: financial, business practice, management, or co
Business processing using cryptography
Secure transaction
C340S870030, C326S080000
Reexamination Certificate
active
07991699
ABSTRACT:
Provided is tamper detection line circuitry for an authentication integrated circuit for use in authenticating an integrated circuit. The tamper detection line circuitry includes a source of pseudo-random bits, and an XOR gate with two inputs and an output in signal communication with flash memory erase and reset circuits. A complete erasure of the memory is triggered by a 0 from the XOR gate. The circuitry also includes first and second paths arranging the source and XOR gate in signal communication with each other, as well as a number of triggers connected to the respective paths, each trigger configured to detect a physical attack on the authentication integrated circuit, said triggers configured to pull a respective path to 0 if a physical attack is detected.
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Nguyen Nga B.
Silverbrook Research Pty Ltd
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