Title:
ID TAG AND READER/WRITER
Document Type and Number:
WIPO Patent Application WO/2006/129357
Kind Code:
A1
Abstract:
When a congestion command is issued from a reader/writer, a multi-bit random number generator (10) of an ID tag 41 generates a random number. An operation unit (8) uses the random number to generate a pseudo-identifier a and returns it to the reader/writer. The reader/writer transmits a re-configuration command requesting re-operation of the pseudo-identifier to the ID tag 41. An operation unit (9) of the ID tag 41 uses the pseudo-identifier a and a unique ID to generate a pseudo-identifier ß and transmits it to the reader/writer. Subsequently, upon reception of a read/write command or other command from the reader/write, the ID tag 41 compares the pseudo-identifier ß held in a memory provided in a command control circuit (7), for example, to the pseudo-identifier ß specified for the reader/writer. If they coincide, the command is accepted. The ID tag 41 accepts the command and response is returned from the ID tag 41, recognition of the ID tag 41 is complete.
Inventors:
ABE KAZUO (JP)
MURAKAMI MASAYUKI (JP)
MURAKAMI MASAYUKI (JP)
Application Number:
PCT/JP2005/010112
Publication Date:
December 07, 2006
Filing Date:
June 02, 2005
Export Citation:
Assignee:
HITACHI ULSI SYS CO LTD (JP)
ABE KAZUO (JP)
MURAKAMI MASAYUKI (JP)
ABE KAZUO (JP)
MURAKAMI MASAYUKI (JP)
International Classes:
G06K19/07; G06K17/00
Foreign References:
| JP2005084926A | 2005-03-31 | |||
| JP2004318478A | 2004-11-11 | |||
| JP2005092585A | 2005-04-07 |
Attorney, Agent or Firm:
Tsutsui, Yamato (6th Floor Kokusai Chusei Kaikan,, 14,
Gobancho,, Chiyoda-k, Tokyo 76, JP)
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