• The Journal of the Korea Contents Association
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• v.11 no.10
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• pp.30-40
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• 2011

Recently, together with the development of wireless communication technologies and the wide use of smart phones, the demand of the next generation mobile communication has been increased. To construct the next generation mobile communication platform efficiently for a short period from protocol development phase to protocol stability phase, an protocol analyzer is required to verify and analyze the protocol. In this paper, we propose the protocol analyzer of LTE network which is the leader of the next generation mobile communication platforms. The protocol analyzer is a software based agent-server architecture and uses XML metadata which defines intercommunication messages to analyze the protocol of the next generation mobile communications. We can analysis the encoding messages applied to LTE network using the loading of the decoding library. We verify the superiority of the proposed analyzer through an integrated test with LTE network.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.8 no.2
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• pp.504-523
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• 2014

This paper presents a multiple-watermarking scheme for copyright protection and the prevention of illegal copying of mobile 3D contents with low resolution. The proposed scheme embeds a unique watermark and a watermark certification authority (WCA) watermark into the spatial and encryption domains of a mobile 3D content based on the buyer-seller watermarking protocol. The seller generates a unique watermark and embeds it into the local maximum curvedness of a 3D object. After receiving the encrypted watermark from the WCA, the seller embeds it into the encrypted vertex data using an operator that satisfies the privacy homomorphic property. The proposed method was implemented using a mobile content tool, and the experimental results verify its capability in terms of copyright protection and the prevention of illegal copying.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.583-585
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• 2002

Mobile Ad Hoc Network에서는 무선으로 연결된 호스트들이 쉽게 이동할 수 있으며 미리 설치된 유선망을 이용하는 셀롤러망과 달리 이동 호스트 사이의 통신만으로 이루어진 망이다. Mobile Ad Hoc Network에서는 각각의 노드들의 이동성이 높기 때문에 이 각각의 노드들의 라우팅 경로를 결정하는 것이 중요하다. 이에 따라 Mobile Ad Hoc Network를 위한 많은 라우팅 프로토콜이 제안되었다. 본 논문에서는 기존에 제안된 Cluster Based Routing Protocol(CBRP)극 변형하여 마치 셀롤러망에서의 셀과 같이 고정된 위치를 하나의 셀로 정의하고 그 하나의 셀이 클러스터를 형성하여 라우팅 오버 헤드를 줄일 수 있는 기법을 제안한다.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.7-8
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• 2006

F-HMIPv6 is protocol that supports fast handovers for Hierarchical Mobile IPv6. Unlike HMIPv6 (Hierarchical Mobile IPv6), it sends FBU(Fast Binding Update) by predicted Router's Information for a potential handover. But, The current version of this protocol doesn't ensure impeccably between mobile node and router. To make up for the weak points of the security, we propose the architecture for F-HMIPv6 protocol to structurally reinforce the security and improve weak security of among mobile node, MAP(Mobility Anchor Point), and routers for binding update when mobile node conducts handovers.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.82-85
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• 2005

In the MIPv6 network, when mobile nodes move into new newtwork, they need to find the new access router and points(AR/AP) for the newtwork. Unless they are not connected to authorized AR/APs, they can be exposed to a lot of attacks. In this paper we propose a protocol to authenticate AR/AR and MN each other. This protocol is based on the public key scheme which is used in the SEcure Neighbor Discovery(SEND) protocol.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.7
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• pp.1634-1642
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• 2014

Mobile RFID system, that consists of the existing RFID reader mounted on the mobile devices such as smartphones, is able to provide the users a variety of services and convenience. But security of mobile RFID system is too weak like the existing RFID system. In this paper, the mobile RFID mutual authentication protocol with high level of security is proposed to overcome the troubles such as cryptographic protocols in the existing RFID system responding with the same value in every authentication procedure and the exposure in the exchange of messages. The proposed protocol exchanges messages unexposed by using the random numbers generated in the mutual authentication between the tag and the reader and making numbers coded with the symmetric key. Besides, the protocol uses the mutual authentication utilizing OTP by considering the characteristics of the reader embedded in mobile devices in the mutual authentication process between the reader and the server. Because changed message in every authentication, which produces safe from spoofing attacks and replay attacks, etc.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.17 no.6
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• pp.1728-1742
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• 2023

In this paper, we extended a hierarchical clustering technique, which is the most researched in the sensor network field, and studied a dynamic differential clustering technique to minimize energy consumption and ensure equal lifespan of all sensor nodes while considering the mobility of sinks. In a sensor network environment with mobile sinks, clusters close to the sinks tend to consume more forwarding energy. Therefore, clustering that considers forwarding energy consumption is desired. Since all clusters form a hierarchical tree, the number of levels of the tree must be considered based on the size of the cluster so that the cluster size is not growing abnormally, and the energy consumption is not concentrated within specific clusters. To verify that the proposed DDC protocol satisfies these requirements, a simulation using Matlab was performed. The FND (First Node Dead), LND (Last Node Dead), and residual energy characteristics of the proposed DDC protocol were compared with the popular clustering protocols such as LEACH and EEUC. As a result, it was shown that FND appears the latest and the point at which the dead node count increases is delayed in the DDC protocol. The proposed DDC protocol presents 66.3% improvement in FND and 13.8% improvement in LND compared to LEACH protocol. Furthermore, FND improved 79.9%, but LND declined 33.2% when compared to the EEUC. This verifies that the proposed DDC protocol can last for longer time with more number of surviving nodes.

• Journal of KIISE:Computing Practices and Letters
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• v.14 no.8
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• pp.773-777
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• 2008

Today's mobile devices have characteristic of random mobility in the heterogeneous networks. Thus they should have various kinds of security requirements. To satisfy these requirements, there are many researches on security and authentication for mobile devices. TCG(Trusted Computing Group) designed TPM(Trusted Platform Module) for providing privacy and authentication to users. Also TCG suggest a protocol, called DAA(Direct Anonymous Attestation) which uses zero knowledge proof theory. In this paper, we will implement DAA protocol using Java and show the efficiency and the problems in the DAA protocol. Finally, we will suggest an efficient mobile DAA model through Java test module for the DAA protocol.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.44 no.10
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• pp.148-155
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• 2007

The routing optimization mode, which Mobile IPv6 provides for the direct communication between a mobile node and its correspond node, introduces various security threats, thus causing several protocols to be proposed for the secure binding update procedure. In particular, the Kang-Park protocol, which Kang and Park presented in 2005, achieves the optimized cryptographic operations and the strong security, while based on its unique security proxy structure. In spite of such advantages, it has some drawbacks in terms of security and efficiency. This paper improves the Kang-Park protocol through the strong CoA validation and early binding update methods. Also, we show that the improved protocol is better than others.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.41 no.5
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• pp.1-9
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• 2004

In this paper, we propose a multicast routing protocol for the seamless delivery of multicast data to mobile hosts through the optimal route in IPv6-Based mobile networks. The proposed multicast routing protocol reduces the tree reconstruction overhead by limiting the tunneling length according to the mobility of mobile hosts. In this way, our protocol satisfies the bound of the end-to-end delay and supports the seamless handoff. Analytical and simulation results show that the proposed protocol has better performance in terms of the tree reconstruction, tunneling service and multicast packet loss than the previous protocols does.