Contactless card

Details Contactless card Contactless card

2005-04-07

2010-06-01

Lee, Michael G (Department: 2876)

Registers

Records

Conductive

C235S380000

Reexamination Certificate

active

07726577

ABSTRACT:
The present invention aims at providing a contactless card that enables a reader/writer to identify which card such reader/writer is communicating with in a set of card identification processes and that improves the possibility of protecting the cardholder's privacy. Contactless card (200) includes: power detection unit (203); random number ID generation unit (210) that determines an identifier that identifies card (200), every time power detection unit (203) detects that electric power has been supplied; ID storage unit (2081) that holds the determined identifier; sending/receiving circuit (204) that receives a command requesting that the identifier that identifies card (200) should be sent to reader/writer (100), and sending/receiving circuit (204) sends, to reader/writer (100), the determined identifier in the case where the received command is a first-received command, and the held identifier in the case where the received command is a second- or later-received command.

REFERENCES:
patent: 6111951 (2000-08-01), Guenther
patent: 6168083 (2001-01-01), Berger et al.
patent: 6462647 (2002-10-01), Roz
patent: 2002/0186838 (2002-12-01), Brandys
patent: 2003/0094491 (2003-05-01), Nakabe et al.
patent: 101 61 302 (2003-07-01), None
“Identification Cards—Contactless Integrated Circuit(s) Cards—Proximity Cards—Proximity Cards—Cartes D'Identification—Cartes A Circuit(s) Integre(s) Sans Contact Cartes De Proximite,” International Standard ISO/IEC, Feb. 1, 2001, pp. I-VII, 1, XP001146902.
“Identification Cards—Contactless Integrated Circuit(s) Cards—Proximity Cards -,” ISO/IEC 14443-3, Jun. 11, 1999.

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