• Journal of the Korea Institute of Information Security & Cryptology
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• v.20 no.4
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• pp.117-134
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• 2010

A passive RFID tag which received attention as a future technology for automatic and quick identification faces some difficulties about security problems such as tag authentication, reader authentication, data protection, and untraceability in addition to cost and reliable identification. A representative passive RFID technology is the ISO/IEC 18000-6 Type C which is an international standard for 900 MHz UHF-band. This standard has some difficulties in applying to the security services such as originality verification, tag's internal information protection, and untraceability, because it does not provide high-level security solution. In this paper, we summarize security requirements of ISO/IEC ITC 1/SC 31 international standardization group, propose security protocols suitable for the UHF-band passive RFID system using a crypto engine, and analyze its security strength. In addition, we verify that it is possible to implement a tag conforming with the proposed security protocols by presenting concrete command/response pairs and cryptographic method.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 1997.11a
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• pp.19-25
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• 1997

At Eurocrypt'91, D. Chaum and E. Heyst introduced the notion of group signatures, which allow members of a group to make signatures on behalf of the group while remaining anonymous. This paper first presents a new type of group signatures with observers. In group signatures with observers, our solution is the most practical group signature scheme, under the assumption that Chaum's electronic wallet is secure.

• Proceedings of the IEEK Conference
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• 1999.11a
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• pp.89-92
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• 1999

This paper describes on the threats such as IP spoofing, denial of service, and ILMI based attack etc. for IP over ATM network. Especially we discuss on the threats due to ATM characteristics that are VC stealing, multiparty and multi-connection call. Also we investigate on the threats of ATM based MPLS network. Finally we discuss and suggest the various solutions of ATM security.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 1992.11a
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• pp.267-275
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• 1992

비선형 체계의 상태 추정량은 H4Z(Ducan - Mortensen - Zakai) 방정식(Runggaldier, Spizzichino: 1987)의 해를 구함으로써 얻어 진다. 일반 비선형 체계의 DMZ 방정식의 해를 구하기는 어렵다. 계산 가능한 "유한 차원"의 DMZ 방정식의 해를 제공하는 체계의 족(class)은 이론 및 실제 응용에 중요하다. 본 연구에서는"마코비안 도약 선형 체계(Marcovian Jump Linear System: MJLS)"의 DMZ 방정식이 유한 차원의 해를 가지는 것을 증명하였다.

• Journal of applied mathematics & informatics
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• v.9 no.1
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• pp.371-380
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• 2002

In this paper we obtain the general solution of a quadratic Jensen type functional equation : (equation omitted) and prove the stability of this equation in the spirit of Hyers, Ulam, Rassias, and Gavruta.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.832-834
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• 2003

오늘날과 같은 컴퓨터와 통신 기반의 네트워크 환경에서 서버들에 대한‘개방성’은 중요한 특징이다. 그러나, 이러한 특성은 서버에 대한 불법적인 접근이나 해킹 등과 같은 침입을 시도할 수 있는 가능성을 내포하고 있다. 침입의 목표는 서버의 모든 시스템정보로서 방화벽이나 침입탐지시스템 등과 같은 네트워크기반의 보안솔루션에 의해 서버의 모든 정보를 보호하기에는 한계가 있다. 본 논문에서는 서버들이 가지고 있는 정보를 보호하기 위하여 기존의 보안커널보다 더 유연하고 안전성이 강화된 보안커널의 설계에 필요한 필수적인 보안요소들을 제안하였다.

• Journal of information and communication convergence engineering
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• v.2 no.2
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• pp.84-88
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• 2004

Firewall is not perfectly prevent hacker, Intrusion Detection System(IDS) is considered a next generation security solution for more trusted network i and system security. We propose a agent IDS model in the different platforms that can detect intrusions in the expanded distributed host environment, since that is a drawback of existing IDS. Then we implement a prototype and verify validity. We use a pattern extraction agent so that we extract audit files needed in intrusion detection automatically even in other platforms.

• International Journal of Computer Science & Network Security
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• v.23 no.9
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• pp.129-133
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• 2023

Classification or prediction problem is how to solve it using a specific feature to obtain the predicted class. A wheat seeds specifications 4 3 classes of seeds will be used in a prediction process. A multi linear regression will be built, and a prediction error ratio will be calculated. To enhance the prediction ratio an ANN model will be built and trained. The obtained results will be examined to show how to make a prediction tool capable to compute a predicted class number very close to the target class number.

• Journal of information and communication convergence engineering
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• v.8 no.2
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• pp.129-135
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• 2010

Wireless sensor networks (WSNs) are an emerging technology and offers economically viable monitoring solution to many challenging applications. However, deploying new technology in hostile environment, without considering security in mind has often proved to be unreasonably unsecured. Apparently, security techniques face many critical challenges in WSNs like data security and secrecy due to its hostile deployment nature. In order to resolve security in WSNs, we propose a novel and efficient secure framework called TriSec: a secure data framework for wireless sensor networks to attain high level of security. TriSec provides data confidentiality, authentication and data integrity to sensor networks. TriSec supports node-to-node encryption using PingPong-128 stream cipher based-privacy. A new PingPong-MAC (PP-MAC) is incorporated with PingPong stream cipher to make TriSec framework more secure. PingPong-128 is fast keystream generation and it is very suitable for sensor network environment. We have implemented the proposed scheme on wireless sensor platform and our result shows their feasibility.

• Journal of the Korean Society of Safety
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• v.12 no.3
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• pp.67-75
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• 1997

This paper presents a study on the application of Asynchronous Team(A-Team) theory for QVC(Reactive power control) and security assessment in a power system. Reactive power control problem is the one of optimally establishing voltage level given reactive power sources, which is very important problem to supply the demand without interruption and needs methods to alleviate a bus voltage limit violation more quickly. It can be formulated as a mixed-integer linear programming(MILP) problem without deteriorating of solution accuracy to a certain extent. The security assessment is to estimate the relative robustness of the system and deterministic approach based on AC load flow calculations is adopted to assess it, especially voltage security. A distance measure, as a measurement for voltage security, is introduced. In order to analyze the above two problem, reactive power control and static security assessment, In an integrated fashion, a new organizational structure, called an A-team, is adopted. An A-team is well-suited to the development of computer-based, multi-agent systems for operation of large-scaled power systems. In order to verify the usefulness of the suggested scheme herein, modified IEEE 30 bus system is employed as a sample system. The results of a case study are also presented.