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Protecting smart cards from power analysis with detachable power supplies

  • US 6,507,913 B1
  • Filed: 12/30/1999
  • Issued: 01/14/2003
  • Est. Priority Date: 12/30/1999
  • Status: Expired due to Term
First Claim
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1. A method of protecting a smart card including a smart card chip which performs computation from cryptanalytic attacks based on power analysis, in which during at least part of computation being performed, furnishing power to the smart card chip from a discharging capacitor contained in the smart card, and during some different part of the computation being performed, charging the capacitor from an external power supply.

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