• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.388-390
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• 2003

DHCP는 인터넷에서 호스트의 설정 정보를 전달하는데 주로 이용되고 있는데, 내부자 위험에 취약하고 그룹별로 동적인 주소 할당이 어렵다는 문제점을 안고 있다. 장기적으로는, 보안 위협을 해소하기 위해 제안된 DHCP 메시지 인증을 이용하면, 이러한 문제점들을 해결할 수 있지만, DHCP 서버와 상대적으로 다수인 DHCP 클라이언트 양측의 기능 확장을 요구하므로 단시간내의 실제 적용이 불가능하다. 본 논문에서는 DHCP 서버만의 기능 확장과 DHCP 서버 감시자를 통해 그룹별 동적 주소 할당과 내부자 보안 위협을 해소하는 방법을 제시한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.22 no.2
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• pp.239-248
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• 2012

VANET (Vehicular Ad-hoc Network) is a type of MANET (Mobile Ad-hoc Network) which is the next-generation networking technology to provide communication between vehicles or between vehicle and RSU (Road Side Unit) using wireless communication. In VANET system, a vehicle accident is likely to cause awful disaster. Therefore, in VANET environment, authentication techniques for the privacy protection and message are needed. In order to provide them privacy, authentication, and conditional, non-repudiation features of the group signature scheme using a variety of security technologies are being studied. In this paper, and withdrawal of group members to avoid frequent VANET environment is suitable for vehicles produced by the group administrator for a private signing key to solve the key escrow problem of a group signature scheme is proposed. We proposed a message batch verification scheme using Bloom Filter that can verify multiple messages efficiently even for multiple communications with many vehicles.

• TTA Journal
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• s.153
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• pp.106-108
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• 2014

• TTA Journal
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• s.161
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• pp.100-102
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• 2015

• TTA Journal
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• s.154
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• pp.118-120
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• 2014

• TTA Journal
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• s.149
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• pp.125-127
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• 2013

• Electronics and Telecommunications Trends
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• v.23 no.4
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• pp.19-29
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• 2008

인터넷 이용이 활성화 되면서 각종 웹 서버에서의 개인정보 과다 수집 및 노출이 큰 이슈가 되고 있다. 인터넷이 우리 생활에 주는 편리함을 그대로 누리면서 개인정보를 보호할 수 있는 방안으로 익명 인증 기술이 있을 수 있다. 익명 인증은 익명성을 제공하는 디지털 서명을 이용한 인증 방법이다. 익명성을 제공하는 디지털 서명 방법은 전자화폐와 전자투표 시스템 등의 응용을 위해서 주로 연구되어 왔으나, 최근에는 인터넷 환경에서 개인정보 보호를 위한 익명 인증 방법의 하나로써 연구되고 있다. 본 고에서는 익명성을 제공하는 전자서명 방법에 관하여 소개하고, 이들 전자서명 방법 중 익명 인증을 위해서 가장 많은 연구가 되고 있는 그룹 서명 방법의 최근 연구동향에 관하여 기술하고자 한다.

• Journal of Korea Multimedia Society
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• v.8 no.4
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• pp.525-535
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• 2005

A password-based authenticated tripartite key exchange protocol based on A. Joux's protocol was proposed. By using encryption scheme with shared password, we can resolve man-in-the-middle attack and lack of authentication problems. We also suggested a scheme to avoid the offline dictionary attack to which symmetric encryption schemes are vulnerable. The proposed protocol does not require a trusted party which is required in certificate or identity based authentication schemes. Therefore in a ad hoc network which is difficult to install network infrastructure, the proposed protocol would be very useful. The proposed protocol is more efficient in computation aspect than any existing password-based authenticated tripartite key exchange protocols. When it is used as a base line protocol of tree based group key exchange protocol, the computational weak points of the proposed protocol are compensated.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.12 no.2
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• pp.89-100
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• 2002

In this paper, we propose a group key management architecture for the secure group communications in mobile netwowrks and authenticated key agreement protocol for this system. Most of existing group key management schemes un certificates based on the public key for the purpose of user authentication and key agreement in secure fashion however, we use the ICPK(Implicitly Certified Public key) to reduce the bandwidth for a certificate exchanging and to improve a computational efficiency. In this architecture, we use two-tier approach to deal with key management where the whole group is divided into two parts; the first is a cell groups consisted of mobile hosts and another is a control group consisted of cell group managers. This approach can provide flexibility of key management such that the affection for a membership change is locally restricted to the cell group which is an autonomous area of the CGM(Cell Group Manager).

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.45 no.10
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• pp.40-48
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• 2008

Security of self organized mobile ad hoc networks is an important issue because administration information in the networks is managed by the constituent nodes. Especially authentication mechanism is necessary for trust setup between newly joining nodes and the network. The authentication models and protocols which are based on the wireline infrastructure could not be practical for mobile ad hoc network. Although public key algorithm-based method is widely used for authentication, it is not easy to be applied to mobile ad hoc networks because they do not have infrastructure such as centralized CA which is needed for certificate verification. In this paper, we consider the public key based random CA group method proposed in [1] to provide efficient authentication scheme to mobile ad hoc networks and analyze the performance of the method, which is then compared to the home CA method. From the analysis results, we see that the random CA method where the function of CA is distributed to some mobile nodes and the authentication information is propagated to randomly chosen CAs shows higher reliability and lower cost than home CA method.