• The KIPS Transactions:PartC
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• v.14C no.4
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• pp.331-340
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• 2007

Mobile network environments are the environments where mobile devices are distributed invisible in our daily lives so that we can conventionally use mobile services at my time and place. The fact that we can work with mobile devices regardless of time and place, however, means that we are also in security threat of leaking or forging the information. In particular, without solving privacy concern, the mobile network environments which serve convenience to use, harmonized without daily lives, on the contrary, will cause a serious malfunction of establishing mobile network surveillance infrastructure. On the other hand, as the mobile devices with various sizes and figures, public key cryptography techniques requiring heavy computation are difficult to be applied to the computational constrained mobile devices. In this paper, we propose efficient PKI-based user authentication and java-based cryptography module for the privacy-preserving in mobile network environments. Proposed system is support a authentication and digital signature to minimize encrypting and decrypting operation by compounding session key and public key based on Korean standard cryptography algorithm(SEED, KCDSA, HAS160) and certificate in mobile network environment. Also, it has been found that session key distribution and user authentication is safety done on PDA.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.3
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• pp.1-6
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• 2015

The IoT(Internet of things) technology enable objects around user to be connected with each other for sharing information. To support security is the mandatory requirement in IoT because it is related to the disclosure of private information but also directly related to the human safety. However, it is difficult to apply traditional security mechanism into lightweight devices. This is owing to the fact that many IoT devices are generally resource constrained and powered by battery. PSK(Pre-Shared Key) based approach, which share secret key in advance between communication entities thereafter operate security functions, is suitable for light-weight device. That is because PSK is costly efficient than a session key establishment approach based on public key algorithm. However, how to safely set a PSK of the lightweight device in advance is a difficult issue because input/output interfaces such as keyboard or display are constrained in general lightweight devices. To solve the problem, we propose and develop a secure PSK configuration scheme for resource constrained devices in IoT.

• Journal of the Korean Society for Precision Engineering
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• v.17 no.2
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• pp.15-32
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• 2000

이 글은 1999년 제49차 CIRP General Assembly에서 Key Note Paper로 발표되었던 논문을 전재한 것이다. CIRP는 생산공학분야의 가장 중요한 국제학술대회 중 하나로, Key Note Session에서는, 각 분야의 대표적 연구자들이 해당 분야의 현황과 추세를 매년 조사한 내용들이 발표된다. 지난해 생산시스템 분야에서 주목해야 할 주제로서 재구성형 생산 시스템(Reconfigurable manufacturing system ; RMS)이 선정되어, 미국, 일본, 유럽의 일곱명의 전문가에 의해 정리된 내용을, Michigan 대학의 Koren 교수가 취합, 편집 및 발표하였다. 원문 요약은 아래와 같다. 21세기 제조업체들은, 글로벌한 경쟁과 예측 불가능하게 급변하는 시장에 효과적으로 대응하여야 할 것이다. 경쟁력을 유지하기 위해서는, 효율적이면서도 시장변화에 조속히 대처 할 수 있는 새로운 생산시스템을 보유하여야 한다. 시장변화에 대한 효율적이며 신속한 대응을 위한 엔지니어링 기술로서 재구성 기술(reconfigurability)이 필요하다. 새로운 생산 방식으로서 재구성형 생산 시스템은, 재구성이 가능한 기계들과 제어 장치, 그리고 그것들을 체계적으로 설계하고 신속하게 초기 가동 관리(ramp-up)하기 위한 방법론으로 이루어진다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.7C
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• pp.1007-1014
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• 2004

In this paper, H.235 based security mechanism for H.323 multimedia applications was implemented in embedded environment. H.235 covers authentication using HMAC-SHAI -96, authenticated Diffie-Hellman key exchange, security capability exchange, session key management for voice encryption, and encryption functions such as DES, 3DES, RC2. H.235-based mechanisms were also analyzed in terms of its security and possible attacks.

• The Bulletin of The Korean Astronomical Society
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• v.41 no.2
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• pp.60.2-60.2
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• 2016

We present recent results of very long baseline interferometry (VLBI) observations of gamma-ray bright active galactic nuclei (AGNs) using Korean VLBI Network (KVN) at 22, 43, 86, and 129~GHz bands, which are part of a KVN key science program; Interferometric Monitoring of Gamma-ray Bright AGNs (iMOGABA). We selected a total of 34 radio-loud AGNs of which 30 sources are gamma-ray bright AGNs, including 24 sources monitored by the Fermi Gamma-ray Space Telescope using the Large Area Telescope on board. The selected sources consist of 24 quasars, 7 BL Lacs, and 3 radio galaxies. In this talk, we summarize recent results of the iMOGABA, including results of single-epoch multi-frequency VLBI observations of the target sources, conducted during a 24-hr session on 2013 November 19 and 20. All observed sources were detected and imaged at all frequency bands with or without a frequency phase transfer technique which enabled to detect and image 12 faint sources at 129 GHz, except for 0218+357 which was detected for only one baseline at all frequency bands.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.24 no.6A
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• pp.894-904
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• 1999

In this paper, a synchronized stream cryptosystem for secure communication in radio channel is designed and its security level is analyzed. The main parts of the proposed cryptosystem consist of synchronization pattern generator, session key generator, and key stream generator. The system performance is evaluated by analyzing the security level depending on the randomness, period, linear complexity, and correlation immunity. Experimental results with image data signal in the 10-1 and 10-2 channel error environment demonstrate the proper operation of the implemented crypto system.

• Journal of Fisheries and Marine Sciences Education
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• v.28 no.1
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• pp.300-314
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• 2016

The purpose of this study was to examine the effects of small-group discussion and panel discussion as teaching and learning methods on college students' competencies of communication, problem-solving and leadership in a general education course. Participants were 52 college students, and they participated in the 13-session lessons. The data from questionnaires collected before and/or after the experiment were analyzed using a paired t-test and percent. The results were as follows. First, each 'total' competency in communication, problem-solving and leadership was increased statistically significant after the experiment. Second, in subdomains of each key competency, 'directed communication' and 'understanding the perspective of others' in communication, and 'divergent thinking', 'decision-making' and 'assessment' subdomains in problem-solving, and all subdomains in leadership were increased statistically significant after the experiment. Based on the results and students' opinions about discussions, the education implications for small-group discussion and panel discussion were discussed.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 1991.11a
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• pp.239-248
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• 1991

ID 기본 암호시스템은 1984년 Shamir에 의해 제안되어 기존의 암호시스템이 가지고 있는 공개키 관리에 대한 문제점을 해결하였다. ID기본 암호시스템은 두 사용자간 암호통신에 적합하지만 이를 1 대 N 그룹통신에 적용할 경우 N개의 각 사용자에 대한 대화키(Session Key)를 생성하여 N번의 암호화로 각 사용자와 암호통신을 해야 하는 문제점이 대두되므로, 본 논문은 지금까지 발표된 ID기본 암호시스템을 바탕으로 1 대 N 그룹통신에 적합하도록 수정된 ID 기본 암호시스템을 제안한다. 제안된 ID 기본 암호시스템은 암호통신을 하고자하는 사용자가 임의의 사용자 그룹을 선정하여 각 사용자와 핸드쉐이크 과정을 통하여 상호 인증을 실시하며, 핸드쉐이크 과정에서 전달된 각 사용자의 비밀키가 포함된 자료를 이용 그룹 공통의 대화키를 생성한다. 제안된 ID 기본 암호방식의 특징은 (i)암호통신을 위한 사용자 그룹은 둘 이상 임의로 선정 가능하고, (ii)상대방 인증을 위해 별도의 해쉬 함수를 사용하지 않으며, (iii)그룹은 하나의 공통 대화키를 사용한다는 점이다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.215-218
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• 2003

In this paper, we propose a protocol both allow a End-to-End security between user and service provider and independent in mobile Internet platform in AIP. In particular, our proposed protocol generates a session key using Weil pairing by ID-based public key system. We analysis a security and efficient of protocol when on-line certification authority participates in authentication process.

• Journal of information and communication convergence engineering
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• v.7 no.3
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• pp.330-334
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• 2009

Most security solutions and middleware on home network consider internet users as approaching subject. It is unrealistic where the most subjects are mobile users who want to control home network devices. Therefore minor and fast certification structures are needed to control other devices with mobile device that has lower computing capacity. To solve the above problems, this paper wants to build safe certification frame work for internet and mobile users to control household devices safely. New certification structure is proposed to get out of heavy certification structure like PKI and to minimize encrypting and decrypting operation by compounding session key and public key.