Non-contact IC card

• US 7,273,163 B2
• Filed: 11/17/2005
• Issued: 09/25/2007
• Est. Priority Date: 08/15/2002
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Sato, Hideo
• Primary Examiner(s): RIZKALLAH, KIMBERLY NGUYEN
• Application Number:
  US11/280,330
• Publication Number:
  US 20060076421A1
• Time in Patent Office: 677 Days
• Field of Search: 235/492, 235/451, 235/380, 235/382.5, 380227-230, 713/172, 713/185, 705 65- 69
• US Class Current: 235/492
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06Q 20/341 Active cards, i.e. cards including their own processing means, e.g. including an IC or chip
• CPC Class Codes: G06Q 20/40975 using encryption therefor
• CPC Class Codes: G07F 7/1008 Active credit-cards provided with means to personalise their use, e.g. with PIN-introduction/comparison system

Abstract

In a non-contact IC card for performing communication with a reader/writer, an encryption block having a DES (data encryption standard) block for performing an encryption operation in accordance with a public key encryption algorithm and an ECC/SHA1 (elliptic curve cryptosystem/secure hash algorithm 1) block for performing an encryption operation in accordance with a common key encryption algorithm are incorporated into an IC chip. A CPU having a built-in clock gear causes a change of the operation frequency of the non-contact IC card. The communication operation with the reader/writer and the encryption operations performed by the encryption block are performed at different operation frequencies.

Claims

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.