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US 6,320,770 B1Granted
Data processing device and method for the voltage supply of same
AssigneeU.S. Philips Corporation
InventorMarkus Feuser
Life of this patent
Estimating the term…
Abstract
The present invention relates to a data processing device (100), notably a chip card, which includes an integrated circuit (10) and a power supply. The power supply includes a voltage converter (12) which converts an output current Iaus (46), powering the integrated circuit (10), into a pulsed input current Iein (44), where Vaus≦Vein.
Claims10
A data processor comprising:
- an integrated circuit;
- and
- a power supply,
- said power supply comprising a voltage buffer for protecting against crypto analysis, wherein the voltage buffer supplies an internal input current Iaus to the integrated circuit, and draws a pulsed input current Iein from the external supply, where Vaus<Vein.
1 more element
A method of powering and protecting an integrated circuit against crypto analysis, the method comprising the steps of:
- converting an external supply voltage Vein into a pulse width modulated output voltage Vaus;
- and
- supplying said Vaus to the integrated circuit,
- where Vaus is inaccessible to a user.
1 more element
A method comprising:
- protecting a data processor from the crypto analysis detection of information characteristic of the operations it carries out by:
- eliminating the variations with time of its supply current and supply voltage.
Dependencies are inferred from the claim text.