• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.757-760
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• 2006

This paper describes X.509 certificate profile, which is basic and important element in the PKI. X.509 certificate consists of basic fields, unique identifiers fields(added in version 2 certificate), and extension fields(added in version 3 certificate). extension fields of version 3 certificate supplement basic fields. We describes extension fields value and its meaning in current internet certificate.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.11 no.5
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• pp.75-84
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• 2001

Existent public key certificates provide authentication information through some information on user\`s public key. However, an attribute certificate which stores and manage user\`s attribute information, provides various privilege information such as position, privilege and role. In recent, international organizations establishes standards on attribute certificate, and the researches and developments on attribute certificate have been widely made. In addition it may be expected to be used many real application area requiring for authorization information as well as authentication information. Therefore, this paper considers background and standardization trends of attribute certificate and describes the profile and related techniques of attribute certificate currently established by IETF. In addition, it introduces and access control system using attribute certificate and specifies applications of attribute certificate.

• Journal of the Korea Society of Computer and Information
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• v.11 no.2 s.40
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• pp.153-158
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• 2006

The effect of solving questions and learning via internet is getting more and more important these days. In this paper we propose an active learning method that makes a database for the information about certificates and practical examinations and accesses it easily. First of all, this method makes it possible to evaluate students individually, improves the motive of learning and gives students a sense of achievement by providing a user-specific question filtering technique using user profile information by weight. And, it elevates the acquisition rate of certificates by advising and managing for certificate-acquisition and it also draw more interest and understanding for future directions. The case using the method of this paper, the examination record of a certificate of qualification is elevated about 10 marks.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.13 no.4
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• pp.99-107
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• 2003

In this paper we propose an international cross certification model using cross certificate. We propose a new model by analyzing and solving current problems of the National PKI. We recommend a certificate profile, design a directory schema, and propose a method to access PSE(personal security environment) using PKCS＃11, which gives the expansibility and convenience. Finally, we propose a certificate path verification method using RFC 3280 and show how to get the certificate chain by using the trust anchor. This model is recommended to the detailed level of specification for the interoperability of each country's PKI.

• KSCI Review
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• v.14 no.1
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• pp.221-228
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• 2006

In this paper we propose an active learning method that makes a database for the information about certificates and practical examinations and accesses it easily. First of all, this method makes it possible to evaluate students individually, improves the motive of learning and gives students a sense of achievement by providing a user-specific question filtering technique using user pronto information by weight. And, it elevates the acquisition rate of certificates by advising and managing for certificate-acquisition and it also draw more interest and understanding for future directions.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.40 no.6
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• pp.237-246
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• 2003

To acquire certificate of security evaluation for information protection Products, it is necessary for a designer to grasp the threats listed in a protection profile and to reflect them in the product design. BDPP is a protection profile for the biometric devices. In this paper, we applied BDPP to a Match-on-Card, and ertracted some security requirements to protect biometric data against threats. We also studied some countermeasures satisfying the security requirements.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2003.12a
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• pp.21-27
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• 2003

오늘날 많은 웹 페이지들이 제한적인 정보의 제공에서 벗어나 ActiveX Control이나 Java Applet과 같은 응용프로그램을 사용자 컴퓨터에 다운로드 하게 하여 다양한 서비스를 제공하고 있다. 이러한 과정에서 인터넷을 통해 다운로드 되는 소프트웨어에 대한 무결성과 배포자에 대한 신원 확인을 해주는 코드 서명 기술이 필요하게 되었다. 본 논문에서는 Microsoft사의 Authenticode와 Netscape의 Object Signing기술에 대하여 분석하고 이러한 코드 서명 기술을 국내 공개키 기반구조(PKI)에 적용하기 위한 인증서 프로파일을 제안한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.14 no.3
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• pp.27-40
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• 2004

Nowadays most web rages provide various services by downloading the applications program such as ActiveX Control or Java Applet. To provide code integrity and publisher authentication of downloaded software in internet, we need code signing technology. In this paper, Authenticode technology of Microsoft is lust analyzed. Based on the analysis, we propose code signing certificate profile and applying method for National Public Key Infrastructure.

• The Transactions of the Korean Institute of Power Electronics
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• v.7 no.5
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• pp.472-481
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• 2002

In this paper, the instantaneous flux Is applied to control the position of the SRG (Switched Reluctance Generator) without position sensor. The position information of the rotor is required in the drive of SRG. These data are generally obtained by a shaft encoder or resolver. In some cases, the EMI(Electro Magnetic Interference), vibration, thermal, and humidity environments may cause the difficulties in maintaining the satisfactory performance for the position detection. Therefore, the elimination of the position and speed sensor is needed. In this paper, a new method for the position estimation of the SRG is proposed. The estimation of the flux is calculated by using the measured voltage and current. The rotor position gets from the flux profile. The output voltage is also controlled constantly by PR control algorithm. These methods are verified by computer simulations md experiments using DSP. Experimental results certificate that the proposed method is able to control the SRG stable, and keep the output voltage constant in spite of changing of the load.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.1
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• pp.205-214
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• 2013

The study of the compatibility of EPUB DRM, granted by the Korea Copyright Commission, as a CT R & D project (Project Title: Development of standard reference software technology for the International Standard EPUB-based eBook DRM) developed standards such as profile standards for encryption, digital signature and authentication certificates and standards for technical terms of rights information. In 2012, these four standards have been established as the Korean Industrial Standards under the names of 'Encryption specification for EPUB DRM', 'the Digital signature specification for EPUB DRM', 'the Certificate specification for EPUB DRM', and 'Definitions of Right Terms for EPUB DRM' through the ODPF(Open Digital Standardization Forum) and the TTA(Telecommunications Technology Association). In spite of the establishment of the eBook DRM standards, however, the absence of the standard technology which supports the compatibility for issues and changes of licenses makes it unable to use eBooks served by different eBook distributors. This study tries to investigate technological approaches to methods of license issues supporting eBook DRM compatibility on the basis of the above-mentioned four EPUB DRM standards and to provide an industrially accepted technological model.