• Proceedings of the Korean Information Science Society Conference
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• 2012.06c
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• pp.269-271
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• 2012

무선 네트워크의 급속한 성장과 더불어 스마트폰(Smart Phone) 사용자들이 급증함에 따라 카페나 지하철역 등 곳곳에서 무선LAN을 이용할 수 있게 되었다. 그러나, 무선LAN 이용자의 증가는 심각한 보안 문제를 야기시킨다. 공격자 AP(Access Point)의 SSID를 합법적인 무선 AP의 SSID와 동일하게 설정한 후, 클라이언트의 접속을 유도하여 공격할 수 있는데, 이러한 공격을 에빌 트윈(evil twin)공격이라고도 한다. 에빌 트윈 공격을 함으로써 공격자의 무선 AP를 이용하는 사용자들의 비밀번호를 스니핑 하거나, 피싱등의 공격을 할 수 있게 된다. 특히, 모바일 AP기능이 가능한 스마트폰 사용자들이 급증하고 있는 가운데, 스마트폰을 이용하면 이러한 공격을 더욱 은밀하고 간편하게 수행할 수 있다. 본 논문에서는 IP주소를 이용하여, 스마트폰을 이용한 에빌 트윈 공격 탐지 방법을 제안하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.541-542
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• 2009

MANET은 유선 기반망의 도움 없이 무선 노드들 간에 서로 협력하여 다중-홉으로 정보를 주고 받을 수 있도록 해주는 네트워크이다. 최근 MANET과 인터넷 망과의 통신이 요구되고 있고 이를 위해 무선 노드가 글로벌 IP 주소를 할당 받을 수 있어야 한다. 본 논문에서는 인터넷 게이트웨이를 통해 인터넷 망과 연결된 MANET 구조에서 무선 노드가 빠르게 글로벌 IP 주소를 설정할 수 있는 기법을 제안한다. 제안하는 기법의 성능 평가를 위해 NS-2로 실험을 수행했으며, 그 결과 기존 방법보다 빠르게 글로벌 IP 주소를 설정하고 네트워크 부하를 감소 시킬 수 있음을 입증하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.155-158
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• 2021

PC 게임, 모바일 게임 시장에는 마블IP를 활용한 게임들이 꾸준히 출시되어왔다. 23편(엔드게임까지)의 마블 영화는 작품성이나 흥행성 등 다양한 측면에서 큰 성공을 거두었다. 하지만 마블IP를 활용한다고 게임이 반드시 성공하는 것은 아니었다. 출시된 마블 게임들을 보았을 때 성공한 게임과 실패한 게임 사례로 나눌 수 있다. 본 논문에서는 마블 IP를 기반으로 제작한 게임들의 특징을 살펴보고 성공 요소와 실패 요소의 대해 분석한 내용을 제시하여 게임을 개발할 때 고려할 요소로 활용할 수 있을 것이다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.23 no.6
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• pp.989-1000
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• 2013

Mobile devices use VPN solution to transfer information securely through open network in mobile office environment. In this paper, we propose Pre_Buffered mechanism that improves the throughput of IPSec VPN using low performance H/W crypto Token. Pre_Buffered method precompute key stream, store them in Buffer and use them in IPSec engine for IP packet processing. Moreover, Design, analysis, and experimental results prove the efficiency and feasibility of our proposed method.

• Journal of the Korea Society of Computer and Information
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• v.19 no.1
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• pp.31-41
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• 2014

This paper proposes a virtual mobile ad-hoc network (VMANET) model that automatically divides heterogeneous mobile devices of a MANET into a number of network groups depending on the communication capacity(data rate) of different network operational models such as IEEE 802.11g, IEEE 802.11b, and Frequency Hopping. In addition, it supports a distinct routing protocol for each network group of VMANETs, resulting in running multiple routing protocols concurrently on different groups of VMANETs. To reduce the network congestion and improve the network load balance, a default MANET gateway is configured in each VMANET and these gateways are responsible for integrating the MANET and IP networks. Experiment results show that the proposed model outperforms the conventional IMANET by significantly increasing throughput and reducing network congestion and network delay.

• Journal of Satellite, Information and Communications
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• v.6 no.2
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• pp.51-59
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• 2011

To support seamless IPTV services in IP-based wireless network, delay or interruption time must be minimized because noticeable interruption will make IPTV service users unhappy. A number of protocols have been proposed for solving mobility problem. However effective seamless handover mechanism to support mobile IPTV services yet to be solved. Mobile WiMAX offers a wireless solution in the access networks that can support IPTV services. Goal of this paper is to identify some reasons of delay time during handover process in an IPv6 capable Mobile WiMAX and to perform handover delay of some optimization scenarios given by existing standardization and proposed improvement.

• Journal of KIISE:Information Networking
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• v.32 no.5
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• pp.603-614
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• 2005

The wireless LAN environment using Mobile IP is constructed and managed to be connected with Ethernet based wired networks. However, there have been many problems with wireless networks using Mobile IP. Some important facts on network performance have not been considered when introducing wireless LAN by Mobile IP to wired networks. In this paper, we suggest schemes which can solve problems on Handover latency caused by the asymmetrical connectivity of the Access Router at applying the HMIPv6 and on binding updates due to the MN frequent movement. Our proposed schemes can reduce network latency by using the HMIPv6 architecture with a virtual router layer, and reduce communication overhead by interchanging information of the MN movement between routers. Our schemes are expected to assist in constructing a more real and effective wireless LAN environment based on the HMIPv6 and FMIP.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.7A
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• pp.493-502
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• 2003

In this paper, to solve some problems of the Mobile IP and local registration strategy we propose a method that can effectively support real-time traffics sensitive to delay time and packet loss. The proposed method reduces the registration time after a Mobile Node's movement between networks by carrying out the pre-registration for the domain which it will move into the network information of the link layer of cdma2000 system, at the boundary cell's handoff zone. Through the cost analysis and simulation it is shown that the proposed scheme yield a better performance compared with the Mobile IP and local registration strategies in terms of packet loss for parameters; variation of the velocity of a Mobile Node, and a distance between the Mobile Node and home networks, etc.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.565-567
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• 2004

All IP,NGN(Next Generation Network)으로 대변되는 차세대 네트워크의 특징 중 하나는 이동성이며 노드의 이동뿐만 아니라 네트워크 전체가 이동하는 모바일 네트워크로 진화하고 있다. 차세대 네트워크의 하위 구조를 이루게 될 MANET에 IPv6를 적용하기 위해, 보다 확장성 있고, 유연하며. 빠르고 가벼운 IPv6의 자동 주소 지정 및 중복 주소 탐지에 관해 논의한다.

• Journal of KIISE:Information Networking
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• v.34 no.1
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• pp.1-15
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• 2007

Increase in the wireless mobile network users brings the issue of mobility management into the Virtual Private Network (VPN) services. We propose a provider edge (PE)-based provider provisioned mobile VPN mechanism, which enables efficient communication between a mobile VPN user and one or more correspondents located in different VPN sites. The proposed mechanism not only reduces the IPSec tunnel overhead at the mobile user node to the minimum, but also enables the traffic to be delivered through optimized paths among the (mobile) VPN users without incurring significant extra IPSec tunnel overhead regardless of the user's locations. The proposed architecture and protocols are based on the BGP/MPLS VPN technology that is defined in RFC24547. A service provider platform entity named PPVPN Network Server (PNS) is defined in order to extend the BGP/MPLS VPN service to the mobile users. Compared to the user- and CE-based mobile VPN mechanisms, the proposed mechanism requires less overhead with respect to the IPSec tunnel management. The simulation results also show that it outperforms the existing mobile VPN mechanisms with respect to the handoff latency and/or the end-to-end packet delay.