Non-contact IC card
First Claim
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.
2 Assignments
0 Petitions
Accused Products
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.
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Citations
12 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A non-contact IC card configured for communicating data with a reader/writer in a contactless manner, said non-contact IC card comprising:
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an encryptor having a public key encryption processor configured to perform a public key encryption operation, and a common key encryption processor configured to perform a common key encryption operation; and a frequency controller configured to change an operation frequency of the non-contact IC card so that communication with the reader/writer and the encryption operations performed by the encryptor are carried out at different operation frequencies, wherein hardware of the encryptor which is not required for the public key encryption operation is configured to not operate during the public key encryption operation, and hardware of the encryptor which is not required for the common key encryption operation is configured to not operate during the common key encryption operation. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification