LIMITED DATA GENERATING DEVICE, LIMITED DATA USE DEVICE, AND LIMIT KEY GENERATING DEVICE

Title:

LIMITED DATA GENERATING DEVICE, LIMITED DATA USE DEVICE, AND LIMIT KEY GENERATING DEVICE

Document Type and Number:

Japanese Patent JP2006227837

Kind Code:

A

Abstract:

To provide a limited data generating device for imposing different limits on every data, and for easily taking defense countermeasures to a tamper act, and for preventing data from being used even by the tamper act after reaching the limit of data use.

The limited data generating device 100 generates limited data on which a use time limit or use frequency limit are imposed. The limited data generating device 100 is provided with a limit key acquiring part 103 for acquiring a limit key by requesting the limit key matching limit information showing the use limit time or the use frequency limit to a limit key generating device which generates the limit key, an encryption part 101 for encrypting the limited data by using the limit key and an input/output part 102 for transmitting the encrypted limited data to the limited data use device using the limited data.

Inventors:

EGASHIRA TORU
TAKESHITA ATSUSHI

Application Number:

JP2005039793A

Publication Date:

August 31, 2006

Filing Date:

February 16, 2005

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Assignee:

NTT DOCOMO INC

International Classes:

G06F21/60; G06F21/62; G09C1/00; H04L9/08

Domestic Patent References:

JP2002324170A	2002-11-08
JP2004030572A	2004-01-29
JP2002342518A	2002-11-29
JP2002202918A	2002-07-19
JP2003233948A	2003-08-22

Attorney, Agent or Firm:

Hidekazu Miyoshi
Iwa Saki Kokuni
Masakazu Ito
Shunichi Takahashi
Ichitaro Ito

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