Non-contact IC card

Details Non-contact IC card Non-contact IC card

2007-09-25

2007-09-25

Nguyen, Kimberly D. (Department: 2876)

Selective cutting (e.g., punching)

With means to impose randomly actuated control of...

Embodying means to detect indicium in work or pattern

C235S451000

Reexamination Certificate

active

11280330

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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