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Dive into the research topics where Yoko Kumagai is active.

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Featured researches published by Yoko Kumagai.


advanced information networking and applications | 2010

Development of Hi-Speed X.509 Certification Path Validation System

Takahiro Fujishiro; Akane Sato; Yoko Kumagai; Tadashi Kaji; Ken Ichi Okada

A hi-speed system to execute certification path validation of the X.509 Certificate was developed. The algorithm used not only certificates and certificate revocation information but also certification path information as cached information in order to speed up transactions. The effect of it was confirmed by the performance experiment of the certification path validation system in test and real environment.


Archive | 2001

Certificate validity authentication method and apparatus

Takahiro Fujishiro; Satoru Tezuka; Yoko Kumagai; Tomoharu Morio; Yutaka Miyazaki


Archive | 2004

Method and apparatus for accelerating public-key certificate validation

Yoko Kumagai; Takahiro Fujishiro; Tadashi Kaji; Shingo Hane; Hitoshi Shimonosono


Archive | 2002

Method and device for confirming validity of certificate

Takahiro Fujishiro; Yoko Kumagai; Yutaka Miyazaki; Tomoharu Morio; Satoru Tezuka; 豊 宮崎; 悟 手塚; 智治 森尾; 洋子 熊谷; 孝宏 藤城


Archive | 2002

Public key certificate generation method, validation method and apparatus thereof

Yoko Kumagai; Takahiro Fujishiro; Satoru Tezuka; Takanobu Oikawa; Izumi Anayama


Archive | 2003

Electronic document management system with the use of signature technique capable of masking

Shingo Hane; Takahiro Fujishiro; Tadashi Kaji; Yoko Kumagai; Junichi Takeuchi


Archive | 2003

SYSTEM FOR MANAGING ELECTRONIC DOCUMENT BY UTILIZING MASKABLE SIGNATURE TECHNOLOGY

Takahiro Fujishiro; Shingo Hane; Tadashi Kaji; Yoko Kumagai; Junichi Takeuchi; 洋子 熊谷; 順一 竹内; 慎吾 羽根; 孝宏 藤城; 忠司 鍛


Archive | 2005

Digital-signed digital document exchange supporting method and information processor

Yoko Kumagai; Takahiro Fujishiro; Tadashi Kaji; Shingo Hane; Hitoshi Shimonosono


Archive | 2003

Authentication and authorization infrastructure system with CRL issuance notification function

Tadashi Kaji; Takahiro Fujishiro; Yoko Kumagai; Shingo Hane; Hiromi Nagano


Archive | 2003

METHOD AND APPARATUS FOR CREATING AND VERIFYING PUBLIC KEY CERTIFICATE

Izumi Anayama; Takahiro Fujishiro; Yoko Kumagai; Takanobu Oikawa; Satoru Tezuka; 隆信 及川; 悟 手塚; 洋子 熊谷; 泉 穴山; 孝宏 藤城

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