CERTIFICATE ISSUING SERVICE METHOD, CERTIFICATE ISSUING SERVICE DEVICE, AND CERTIFICATE ISSUING SERVICE PROGRAM

Title:

CERTIFICATE ISSUING SERVICE METHOD, CERTIFICATE ISSUING SERVICE DEVICE, AND CERTIFICATE ISSUING SERVICE PROGRAM

Document Type and Number:

Japanese Patent JP2005303779

Kind Code:

A

Abstract:

To provide a new technique that can smoothly cope with the occurrence of a crisis in an issuer's secret key when constructing certificate issuing service, and can technically avoid the risk of a person who performs certificate issuing service and a user.

A plurality of certificates signed by different issuer's secrete keys are created to one certificate issuing request, and are issued to the user. And when it is determined that safety in the issuer's secrete keys used for issuing the certificate is lost, a safe issuer's secrete key is used to create a new certificate for issuing. By this configuration, a smooth response can be made to the occurrence of a crisis in the issuer's secret keys, and the risk of the person who performs certificate issuing service and the user can be technically avoided.

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Inventors:

TAKEMURA HIDEYUKI
NAGAYOSHI TAKESHI
ARAI SATOSHI

Application Number:

JP2004118774A

Publication Date:

October 27, 2005

Filing Date:

April 14, 2004

Export Citation:

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Assignee:

NIPPON TELEGRAPH & TELEPHONE

International Classes:

H04L9/08; H04L9/14; H04L9/32; (IPC1-7): H04L9/08; H04L9/14; H04L9/32

Domestic Patent References:

JPH02291043A	1990-11-30
JP2000115160A	2000-04-21
JP2002207426A	2002-07-26

Foreign References:

WO2003007203A2

2003-01-23

Other References:

今枝直彦, 政本廣志: "ＣＡにおける複数署名アルゴリズムの実装に関する一考察", 電子情報通信学会２００３年総合大会講演論文集　基礎・境界, CSNJ200300015001, 3 March 2003 (2003-03-03), pages 180, ISSN: 0000858198
MATTI A. HILTUNEN, RICHARD D. SCHLICHTING, CARLOS A. UGARTE: "Using Redundancy to Increase Survivability", ISW2000, JPN4007010839, 24 October 2000 (2000-10-24), ISSN: 0000858199

Attorney, Agent or Firm:

Yoshiyoshi Ogasawara
Yutaka Morita
Hikaru Okada

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