Electrical computers and digital processing systems: support – Data processing protection using cryptography – Tamper resistant
Reexamination Certificate
2003-05-02
2009-11-17
Dada, Beemnet W (Department: 2435)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
Tamper resistant
C726S026000, C713S300000
Reexamination Certificate
active
07620823
ABSTRACT:
A smart card includes an integrated circuit device having secure information therein. A protection circuit is provided within the smart card. This protection circuit is configured to protect the integrated circuit device, by preventing unauthorized retrieval of the secure information using a power analysis technique. This is done by maintaining at least one power supply line that is electrically coupled to the integrated circuit device at a substantially uniform voltage when the integrated circuit device is active. This uniform voltage operates to mask the operations performed by the integrated circuit device, and thereby conceal these operations from external hardware that may be designed to support the power analysis technique. In particular, a variable capacitor is provided to supply displacement current to the power supply line and the integrated circuit while the capacitance of the capacitor is gradually decreased at an appropriate rate to support a constant supply voltage on the power supply line.
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Dada Beemnet W
Myers Bigel & Sibley & Sajovec
Pan Joseph
Samsung Electronics Co,. Ltd.
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