• The Journal of Korean Institute of Communications and Information Sciences
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• v.37C no.12
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• pp.1256-1262
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• 2012

Mobile ad hoc networks (MANETs) are infrastructure-less, autonomous, and stand-alone wireless networks with dynamic topologies. Recently, cluster-based ad hoc networks which enhance the security and efficiency of ad hoc networks are being actively researched. And routing protocols for cluster-based ad hoc networks are also studied. However, there are few studies about secure routing protocols in cluster-based ad hoc networks. In this paper, we propose secure routing protocol for cluster-based ad hoc networks. We use Diffie-Hellman key agreement, HMAC, and digital signature to support integrity of routing messages, and finally can perform secure routing.

• The Transactions of the Korea Information Processing Society
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• v.7 no.8
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• pp.2421-2429
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• 2000

With the advance of wireless communications technology, mobile communications have become more convenient than ever. Nowadays, people can communicate with each other on any place at any time. However, because of the openness of wireless communications, the way to protect the privacy between communicating parties is becoming a very important issue. In this paper, we present a study on the authentication and message encryption algorithm to support roaming service to the GSM network. To propose an authentication and message encryption algorithm applicable to the GSM system, the security architecture of the GSM outlined in the GSM standard is briefly introduced. In the proposed cryptosystems we use a new hash function for user authentication and a stream cipher based on Linear Feedback Shift Register(LFSR) for message encryption and decryption. Moreover, each algorithm is programmed with C language and simulated on IBM-PC system and we analyze the randomness properties of the proposed algorithms by using statistical tests.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.292-294
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• 2004

이동통신사가 선택한 컨텐츠만이 사용자들에게 서비스 될 수 있는 환경에서 다양한 컨텐츠 서비스의 제공을 기대하기는 어려운 실정이다. 이 같은 문제를 해결하기 위해 서비스 제공자들은 이동통신회사의 전송망을 대여하여 자신들의 모바일 포털 서비스를 통해 사용자들에게 다양한 컨텐츠를 제공할 수 있다. 그러나 개별적으로 관리되는 사용자 인증 서버를 통한 인증과정은 사용자들에게 반복적인 인증정보제공절차를 강요한다. 이러한 보안정보의 빈번한 노출로 인하여 잠재적인 보안 취약성이 야기된다. 단일인증이 보안정보 노출의 최소화를 위한 대안이 될 수 있지만 모바일 기기들의 성능적인 제약은 모바일 및 유비쿼터스 환경에 단일인증을 적용하는데 걸림돌이 되고 있다. 본 논문에서는 유무선 통합 환경에서 단일인증을 제공하기 위해 모바일 단말기와 유선도메인 간에 인증정보를 교환하는 profile을 정의하여 모바일 단말기의 성능적인 제약을 극복하기 위한 방안을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10b
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• pp.985-988
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• 2001

사용자 망이 전 세계적으로 연결되고 이동 통신 서비스가 급속하게 확대되어 감에 따라 신뢰성과 보안 문제가 크게 대두되고 있다. 본 논문에서는 인터넷 환경에서 무선 이동호스트(단말)의 특성을 감안한 호스트의 인증과 안전한 키 분배 프로토콜을 제안한다. 또한 제안된 프로토콜은 중간 에이전트나 다른 이동 호스트로부터 자신의 ID와 위치를 감출 수 있는 프라이버시를 보장한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.160-161
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• 2013

Extending mobile IP to ad hoc networks with the foreign agent acting as the bridge between the wired network and ad hoc networks can provide the global Internet connectivity for ad hoc hosts. The existing research in the area of the integrated wired and ad hoc network is carried out in a non-adversarial setting. This paper analysed an effective solution to solve the security related problems encountered in these integrated networks. This security protocol also excludes malicious nodes from performing the ad hoc network routing. This paper focuses on preventing ad hoc hosts from the attacks of anti-integrity.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.11 no.3
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• pp.3-12
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• 2001

In this course of Internet proliferation, many network-related technologies are examined for possible growth and evolution. The use of Internet-based technologies is private networks has further fuelled the demand for network-based applications. The most promising among the new paradigms is the use of mobile agents. The mobile agent is capable of migrating autonomously form node to node in the network, to perform some computations on behalf of the user. The mobile agent paradigm is attractive alternative to traditional client-server programming for a significant class of network-centric applications. It does however, suffer. from a major drawback namely, the potential for malicious attacks, abuse of resources, pilfering of information, and other security issues. These issues are significantly hampering the acceptance of the mobile-agent paradigm. This paper describes the design of a secure mobile agent gateway 7hat can split and merge the agent code with security policy database on the VPN. This mechanism will promote security in the mobile agent systems.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37C no.10
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• pp.986-992
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• 2012

As the utilization of smart mobile devices such as smartphones increases, the desire to utilize such devices to control and monitor combat situations also arises. As smart mobile devices with various ICT get integrated with various weaponry system, a new phase of future warfare can be introduced. Moreover, smartphone-based real-time information technology for joint battle command system will be converged with surveillance control to become a leading example of convergence of cyber defense and information technology. Furthermore, mobile device security technology ideal for mobile wireless network environments can be applied to military robots. The following paper will give an overview of smart mobile device usage used for military purposes in battle command system, various security threats and the mobile device security technology to correspond to such security threats.

• Convergence Security Journal
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• v.7 no.4
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• pp.43-50
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• 2007

Electric quantity of sensor nodes is extremely limited, and the battery replacement is very difficult in wireless sensor networks. This paper proposes analytic model on energy loss in different route structure, which it is based upon the data-centric storage and the directed diffusion is energy consumption in the wireless sensor network.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.858-861
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• 2011

최근 VoIP 서비스는 IP 네트워크의 안정화를 기반으로 국내 기업 Legacy PSTN 시장을 빠르게 대체해 가고 있다. 그러나 VoIP 서비스는 기존 인터넷망에서 발생 할 수 있는 보안 취약성 뿐 아니라 인터넷 전화 트래픽의 통과 문제 및 VoIP 스팸이나 도청 같은 기존에 없었던 새로운 이슈들을 발생 시키고 있다. 특히 SIP 인증 취약점을 이용한 Fraud Call 공격은 VoIP 서비스 사용자로 하여금 원하지 않은 호 및 과금을 대량 발생 시키는 공격기법으로 최근 기업의 피해사례가 늘어 나고 있다. 본 논문은 Fraud Call의 공격 기법을 분석하고, 호 인증 측면에서의 보안적 대응방안을 기술하고자 한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.2
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• pp.77-83
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• 2010

Vehicular Ad Hoc Networks are self-organizing Peer-to-Peer networks that typically have highly mobile vehicle nodes, moving at high speeds, very short-lasting and unstable communication links. VANETs are formed without fixed infrastructure, central administration, and dedicated routing equipment, and network nodes are mobile, joining and leaving the network over time. So, VANET-security is very vulnerable for the intrusion of malicious and misbehaving nodes in the network, since VANETs are mostly open networks, allowing everyone connect, without centralized control. In this paper, we propose a rough set based anomaly detection method that efficiently identify malicious behavior of vehicle node activities in these VANETs, and the performance of a proposed scheme is evaluated by a simulation in terms of anomaly detection rate and false alarm rate for the threshold ${\epsilon}$.