• Proceedings of the Korean Information Science Society Conference
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• 한국정보과학회 2002년도 봄 학술발표논문집 Vol.29 No.1 (A)
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• pp.766-768
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• 2002

암호 사용이 증가하는 현 시점에서 키 복구 기능은 PKI(Public Key Infructure)의 부가 서비스로써 제공되어야 한다. 그러나 현재 제안된 키 복구 시스템들은 PKI에서 이용하기에는 부적절한 면을 많이 가지고 있다. 본 논문에서는 공개키 기반 구조에서 인증서를 발행하는 일련의 순서를 따라 진행하면서 키 복구를 지원하는 시스템을 제안한다. 제안된 시스템에서 사용자의 공개키는 인증기관에 의해서 생성되고, 사용자의 비밀키는 자신이 안전하게 생성하게 된다. 인증기관은 사용자의 비밀키를 모르면서 사용자의 인증서를 발행하게 된다.

• Proceedings of the Korea Information Processing Society Conference
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• 한국정보처리학회 2002년도 추계학술발표논문집 (중)
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• pp.857-860
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• 2002

오늘날 인터넷 사용자의 급속한 증가와 데이터 중심의 무선 동신 기술의 빠른 성장으로, 중요한 정보를 비밀리에 전달하고자하는 보안성의 요구가 증가하고 있다. 무선인터넷은 데이터 공개성을 갖는 무선 매체를 사용한다는 점과 단말 혹은 사용자가 이동한다는 고유의 특성으로 인하여 제한된 CPU와 메모리 때문에 기존의 유선 PKI(Public Key Infrastructure)체계를 그대로 적용할 수 없는 기존 인터넷 보안 체계에 비해서 훨씬 복잡한 구조가 요구된다. [1] 본 논문에서는 이동하는 단말의 인증을 위한 효율적이고 유용한 식별자 적용기술인 스마트카드를 이용한 무선 인터넷 보안을 제공하기 위해 Mobile PKI 기반의 보안구조를 제안하여 보안을 강화하고자한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• 제13권2호
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• pp.81-89
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• 2003

With the rapid development of information and communication technology, online dissemination increases rapidly. So, It becomes more important to protect information. Recently the authentication system using public key infrastructure (PKI) is being utilized as an information protection infrastructure for electronic business transactions. And the smartcard system makes the most use of such an infrastructure. But because the certification based on the current PKI provides oかy basic user certification information, the use has to be limited in various application services that need the identification and authorization information as well as face-to-face information of the user. In order to protect a system from various kinds backings and related treats, we have proposed angular and private key multiplexing for prevention of smartcard forgery and alteration based on a photopolymer cryptosystem. When smartcard becomes prone to forgery and alteration, we should be able to verify it. Also, our parer proposes a new authentication system using multi authentication based on PKI. The smartcard has an excellent advantage in security and moving.

• Proceedings of the KAIS Fall Conference
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• 한국산학기술학회 2010년도 춘계학술발표논문집 1부
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• pp.499-502
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• 2010

본 논문에서는 동영상 데이터 암호화를 위해 비디오 데이터의 I-프레임 암호화 기법을 제안한다. 또한 시스템 서버에서 암호화된 멀티미디어 데이터를 클라이언트 시스템에서 사용자가 실행할 때 자동으로 사용자 인증과 데이터의 복호화를 수행할 수 있도록 하는 라이선스 에이전트를 제안한다. 라이선스 에이전트는 사용자의 멀티미디어 데이터의 실행 시 공유 키 풀(shared key pool)을 이용한 PKI(Public Key Infrastructure)기반의 사용자의 인증과 멀티미디어 데이터의 암호 및 복호화를 수행한다. 또한 비밀키 기반의 공개키 분배 시스템을 이용하여 키의 누출을 미연에 방지하고 키의 누출 시 그 경로를 추적할 수 있도록 하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• 제31권8A호
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• pp.804-813
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• 2006

In wireless Internet environment that demand of wireless Internet service increase steadily, wireless PKI(Public Key Infrastructure) service is appearing on stage as necessary essential base technology for information protection service offer, In this paper, we propose the method for verification to reduce the communication overload using VID to CSMP made with a goal of the performance guarantee for security and use in a real time and examine the existent certificate verification methods. The performance of security and the use in a real time is guaranteed by managing the note of authentification by the person who verifies and reducing the amount of the data transmission using VID.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 한국해양정보통신학회 2009년도 춘계학술대회
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• pp.781-784
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• 2009

IPTV, which is convergence of Communication and Broadcasting, has improved quickly recently. This service can provide high quality and various services to their customers, such as choosing channels freely, VOD and many kinds of Interactive service. As the technology of IPTV rapid development, more and more people worry about its disadvantages during the spread and apply, for instance, the illegal application, illegal copy, access authority abuse and the danger of the IPTV contents. This paper will provide the solution to solve these problems, through the Public Key Certificate of PKI(Public Key Infrastructure) and the Attribute Certificate of PMI(Privilege Management Infrastructure).

• Journal of the Korea Institute of Information Security & Cryptology
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• 제19권1호
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• pp.3-11
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• 2009

Forward secrecy in an e-mail system means that the compromising of the long-term secret keys of the mail users and mail servers does not affect the confidentiality of the previous e-mail messages. Previous forward-secure e-mail protocols used the certified public keys of the users and thus needed PKI(Public Key Infrastructure). In this paper, we propose a password-based authenticated e-mail protocol providing forward secrecy. The proposed protocol does not require certified public keys and is sufficiently efficient to be executed on resource-restricted mobile devices.

• The KIPS Transactions:PartD
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• 제9D권2호
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• pp.323-328
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• 2002

In recent years, e-Commerce is very active on the Internet, especially the World Wide Web alone: with the popularization of Internet using high-speed networks. Especially, Circulation of Multimedia Contents like MP3 data if widely being focused as one of the popular researches. However, the existing models of AOD (Audio On Demand) System lack substantial illegal copy protection or copyright protection. In this paper, we propose an AOD System that guarantees substantial illegal copy protection and copyright protection based on the PKI (Public Key Infrastructure). As transmitting MP3 data using the user's public key, the proposed .method prevents the attack of dropper during transmitting data. Also, it guarantees the right of users and distributors by prohibiting illegal users from using MP3 data.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 한국정보통신학회 2016년도 추계학술대회
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• pp.463-466
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• 2016

Sharing of product and process information with partners is a basic activity and key requirement which ensures success of distribution. ePedigree that encapsulates all of the event data from manufacturer to retail shop provides a flexible mechanism of storing and sharing traceable information to the partners of supply chain and credibility of shared information through digital signature based on Public Key Infrastructure (PKI). To generate the signature that can be authenticated through PKI, the partners of supply chain should pay for PKI certificates from Certificate Authority (CA). In case of agrifood cooperatives which consist of petty merchants or farmers, it is hard to pay for the PKI certificate for all members and is a big obstacle for the ePedigree to be applied to the supply chain. This paper proposes a private certification method of ePedigree for cooperatives. Cooperatives can apply the ePedigree using the proposed method to all the members at small cost and the proposed method can assure the credibility of information at the same level of the previous ePedigree.

• Journal of the Korea Institute of Information Security & Cryptology
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• 제11권3호
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• pp.63-69
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• 2001

Smartcard is highlighted as infrastructure that has an excellent security for executing functions such as user authentication, access control, information storage and control, and its market is expanding rapidly. But possibilities of forgery and alteration by hacking are increasing as well. This paper proposes a method to prevent card forgery and alteration using angular multiplexing and private key multiplexing method on optical encryption, and proposed a Public Key Infrastructure(PKI)-based authentication system combined with One-Time Password (OTP) for verification of forgery and alteration .