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Non-contact IC card

  • US 7,134,604 B2
  • Filed: 08/05/2003
  • Issued: 11/14/2006
  • Est. Priority Date: 08/15/2002
  • Status: Expired due to Fees
First Claim
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1. A non-contact IC card for communicating data with a reader/writer in a contactless manner, said non-contact IC card comprising:

  • encryption means having a public key encryption processor for performing a public key encryption operation, and a common key encryption processor for performing a common key encryption operation; and

    frequency control means for changing an operation frequency of the non-contact IC card so that communication with the reader/writer and the encryption operations performed by the encryption means are carried out at different operation frequencies,wherein hardware of the encryption means which is not required for the public key encryption operation is not operated during the public key encryption operation, and hardware of the encryption means which is not required for the common key encryption operation is not operated during the common key encryption operation.

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