• Journal of the Korean Society for information Management
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• v.19 no.1
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• pp.23-46
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• 2002

With explosively increasing digital contents, library and Information center should have a new role between knowledge providers and knowledge users as information brokering organization. Electronic transaction system should be required for performing this brokering service since economic value is added to information and knowledge in information society. The developments and changes around library are keeping up with increasing building digital library and digitalizing printed sources. With the rapidly changing circumstances, the Internet is currently witnessing an explosive growth. By serving as a virtual information resource. the Internet can dramatically change the way business is conducted and Information is provided. However because of features o( the Internet like openness and information sharing, it has fundamental vulnerabilities in security issues. For Instance, disclosure of private information and line eavesdropping such as password, banking account, transaction data on network and so on are primary obstruction factors to activation of digital contents delivery on network. For high network security and authentication, this paper looks at smart card technologies and proposes multi-authentication protocol based on smart card on open network, implements and analyzes it.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.1185-1188
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• 2004

기존의 IEEE 802.11 표준에 따르는 무선랜에서 보안에 취약한 점들이 발견된 후, 이를 보완하기 위한 802.11i 규격이 작성되고 있다. 이에 따르면, STA가 로밍하는 과정에서 new AP와 reassociation 이후 AP로부터 인증을 받는 과정을 추가로 거쳐야 한다. 이는 로밍 과정에서 발생하는 지연을 늘리고, 따라서 데이터 프레임들의 손실을 가져온다. 그런데, new AP와 STA 사이의 보안협상이 완료될 때까지, old AP에서 손실될 데이터 프레임을 old AP의 보안 정보를 적용하여 new AP를 통해서 STA로 전달함으로써 이러한 데이터 손실을 막을 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.892-895
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• 2012

RIFD 시스템은 개체 인증, 전자결제 등 다양한 분야에서 사용되고 있다. 무선통신의 특성상 악의적인 공격자로부터 중계공격이 가능하여 공격자가 정당한 사용자로 가장할 수 있다. 이러한 중계공격을 예방하기 위하여 Distance Bounding이라는 개념의 프로토콜이 제안되어 왔다. 하지만, 기존 연구는 태그 ID 전달의 기밀성을 보장하지만 ID 검색의 비효율성 및 불필요한 두 번째 저속 단계가 존재하는 단점이 있다. 따라서 본 논문은 ID의 검색 없고, 시도 값과 응답 값을 2bits로 하여 마지막 저속 단계를 생략하며, 고속 단계에서 공격자의 공격 탐지 및 Terrorist 공격에 대하여 $(1/2)^n$의 공격 성공률을 갖는 2BP(2Bit 2Phase) Distance Bounding 프로토콜을 제안한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.4
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• pp.788-794
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• 2007

The policy of US DoD is moving towards implementation of Network Centric Warfare(NCW) concepts. NCW is commonly described as the integration and synchronization of four key interdependent elements such as command and control, sensor system, engagement systems and the network. Therefore the military policy of Korea military is needed to access and examine the policy of NCW communication environment and crypto communication, which is able to apply it. In this case study, We are reviewed the security framework of the concept of network centric warfare in the centering around the US. It is introduced the core technology in the network centric warfare, and it is reviewed the security framework such as, the requirements of security, the characteristics security of global information grid, joint tactical radion system, net centric enterprise services, transformational communication satellite, in the basis of core technology, and analysis the effect of crypto communication relay between command node and surbornate node in NCW environment. This report support the assistance, which is considered the elements of surrounding effects in the varied crypto communication research area of NCW.

• Convergence Security Journal
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• v.18 no.4
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• pp.73-79
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• 2018

Since 1910s, the drones were mainly used for military purposes for reconnaissance and attack targets, but they are now being used in various fields such as disaster prevention, exploration, broadcasting, and surveillance of risk areas. As drones are widely used from military to civilian field, hacking into the drones such as radio disturbance, GPS spoofing, hijacking, etc. targeting drones has begun to occur. Recently, the use of drones in hacking into wireless network has been reported. If the artificial intelligence technology is applied to the drones in the military, hacking into unmanned combat system using drones will occur. In addition, a drone with a hacking program may be able to relay a hacking program to the hacking drone located far away, just as a drone serves as a wireless communication station. And the drones will be equipped with a portable GPS jamming device, which will enable signal disturbance to unmanned combat systems. In this paper, we propose security threats and the anticipated hacking scenarios using the drones on the battlespace to know the seriousness of the security threats by hacking drones and prepare for future cyberspace.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.11a
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• pp.1063-1066
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• 2005

본 논문에서는 모바일 인터넷에서 보안에 대해 논의한다. 무선 인터넷 사용자나 프로그램 및 네트워크 기술들이 지난 몇 년간 눈부시게 발전했다. 단말기의 제약사항으로 인하여 모바일 인터넷은 유선의 인터넷과 몇 가지 다른 구조를 가지고 있다. 단말기의 제약사항으로 인해 무선중계 보안 시스템 설계 시 그 기반이 될 수 있는 무선 인터넷 프로토콜(WAP, I-mode, ME) 중에서 전세계적으로 가장 표준으로 알려진 WAP에 대해서 살펴보고 무선 통신에서 보안 서비스를 위해 사용되는 WTLS와 이를 위한 공개키 기반 구조(WPKI)에서 요구사항을 살펴본다. 실질적으로 무선 인터넷 서비스를 제공하는 자바 보안 기법에 대해서 논의한다.

• The Journal of Korean Institute of Information Technology
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• v.17 no.5
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• pp.105-116
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• 2019

Most of the public and private buildings in Korea are installing CCTV for crime prevention and follow-up action, insider security, facility safety, and fire prevention, and the number of installations is increasing each year. In the questionnaire conducted on the increasing CCTV, many reactions were positive in terms of the prevention of crime that could occur due to the installation, rather than negative views such as privacy violation caused by CCTV shooting. However, CCTV poses a lot of privacy risks, and when the image data is collected using the cloud, the personal information of the subject can be leaked. InseCam relayed the CCTV surveillance video of each country in real time, including the front camera of the notebook computer, which caused a big issue. In this paper, we introduce a system to prevent leakage of private information and enhance the security of the cloud system by processing the privacy technique on image information about a subject photographed through CCTV.

• Journal of Convergence for Information Technology
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• v.9 no.3
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• pp.22-29
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• 2019

Due to the development of ICT technology, convergence reality contents are utilized as technology for providing services in various industrial fields by visualizing various information such as sensor information and shared information in a service platform showing only simple three-dimensional contents. Research is underway to reduce the weight of applications by transmitting the resources of the object to be enhanced to the network as the information and the contents to be provided increase. In order to provide resources through the network, servers for processing various information such as pattern information, content information, and sensor information must be constructed in a cloud environment. However, in order to authenticate data transmitted and received in real-time in a cloud environment, there is a problem in that the processing is delayed and a delay phenomenon occurs in the rendering process and QoS is lowered. In this paper, we propose a system to distribute cloud server which provides augmented contents of convergent reality service that provides various contents such as sensor information and three - dimensional model, and shorten the processing time of reliable data through distributed relay between servers Respectively.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.2
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• pp.49-54
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• 2018

In this paper, we study the secrecy outage probability when using cooperative diversity and jammer in a relay system based on decode-and-forward. MRC method is used in receiver and eavesdroppers to obtain cooperative diversity. To use the MRC technique, direct links between the sender and receiver, and between the sender and the eavesdropper are used, respectively. Jammers are used to generate intentional noise siganls to increase security capacity. Jammers generate intentional noise, degrading the channel quality of the eavesdropper and helping physical layer security be realized. The secrecy outage probability is used to evaluate security performance. Assume that the system is under the Rayleigh fading channel.

• Proceedings of the KIEE Conference
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• 2007.11b
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• pp.54-56
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• 2007

DLMS(Device Language Message Specification) 메시지 규약과 COSEM(Companion Specification for Energy Metering) 오브젝트 모델링 기법을 채택한 계량기 통신 및 오브젝트 모델 표준인 IEC62056은 계량기의 상호 운용, 관리, 보안 그리고 계략 데이터 모델링에 대한 방법 등을 기술하고 있으며 TCP-UDP, GPRS, PSTN등의 원격 접속을 위한 프로파일을 지원하고 있다. 본 논문에서는 DLMS계량기의 계량 데이터를 수집 및 관리하는 IEC6056 기반의 energy information concentrator(이하 EIC)를 제안한다 이 중계장치는 COSEM 오브젝트로 구성되어 있는 DLMS 계량기를 EIC의 논리장치로 모델링하여 등록 관리하는 새로운 개념의 DLMS 중계장치이다. 쉽게 말해서 IEC62056을 따르는 DLMS 클라이언트에서 EIC를 바라볼 때 여러 개의 논리 장치를 가지는 DLMS 장치로 인식이 된다. EIC는 특성상 기능적으로 크게 두 부분으로 나누어지는데, 상위 시스템과의 인터페이스를 담당하는 서버부분과 계량기로부터 데이터를 수집하는 클라이언트 부분이다. 서버 부분은 계량 데이터 오브젝트 관리 모듈 부분과 TCP/IP서버 모듈로 나누어지며 클라이언트 부분은 DLMS 계량기 스케줄링 부분과 DLMS 클라이언트 부분으로 나누어진다. 개발된 EIC는 최대 111대까지의 계량기를 지원 관리할 수 있으며, 각 1Mbit 용량의 오브젝트를 구성 할 수 있다.