• ETRI Journal
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• v.24 no.1
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• pp.12-22
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• 2002

A Mobile IP allows IP hosts to move between different networks without changing their IP addresses. Mobile IP systems supporting local registration were introduced to reduce the number of times a home registration with the remotely located home agent was needed. The local registration Mobile IP scheme enhanced performance by processing registration requests of mobile nodes at a local agent. The local registration approach may affect other aspects of the Mobile IP systems such as fault tolerance. In this paper, we briefly review previous solutions for supporting fault tolerance in local registration Mobile IP systems and propose a fault tolerance protocol with a backup foreign agent in a hierarchical local registration mobile IP to enhance the efficiency of such systems against foreign agent failures. We also describe the specification of the proposed protocol using LOTOS and perform its validation using MiniLite. Finally, we analyze the performance of our proposed fault tolerance protocol through simulation.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.15 no.3
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• pp.43-52
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• 2005

MIPv4 supports node mobility, manages MN's binding list and provides seamless communication through registration protocol. Since the registration protocol usually operating in the wireless environment involves authenticating MNs, it is a general approach to introduce the AAA infrastructure as key distribution center for the purpose of authentication. In this paper, we propose an efficient registration protocol with lightweight AAA based on domain key. Proposed protocol also withstands various replay attacks, and provides non-repudiation service for the accounts of the usage of the network service.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.3C
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• pp.220-225
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• 2002

Mobile IP aims to support mobility within the Internet. This paper concerned with the security aspect of Mobile IP. We show that current registration protocol has a possible replay attack despite the use of authenticated registration message and replay protection. We propose a public-key based registration protocol that also distributes a session-key distribution protocol in AAA. Proposed protocol provides authentication of mobile node and session-key distribution simultaneously. It also provides non-repudiation of service request.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.3C
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• pp.211-219
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• 2002

Mobile IP(RFC2002) is representative protocols that support mobility to host. In this paper, we propose a mobile IP registration protocol using public-key based certificates and CA(certification authority). Our proposed protocol authenticates the registration message of mobile node and prevents replay attack and minimal use of public key cryptography, Also, Our proposed protocol directly authenticates between agents and mobile nodes using certificates. Though the computer simulation, we prove that our proposal has better performance than the previous public-key based Mobile IP registration protocol.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.11C
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• pp.1-9
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• 2001

The Mobile IP protocol allows IP hosts to move between different networks without changing their IP addresses. The Mobile IP systems supporting the local registration were introduced to reduce the number of times when a home registration with the remotely located Home Agent is needed. The local registration Mobile IP protocol enhanced the performance by processing the MN\`s registration requests at a local agent. However. the local registration approach may consider other aspects of the Mobile IP systems as the FA fault tolerance. In this paper, we will briefly review previous protocols to support the FA fault tolerance in hierarchical local registration Mobile If system and will propose a fault tolerance protocol with backup FA in hierarchical local registration mobile IP t() enhance the efficiency of such systems against Foreign Agent failures.

• Journal of Korea Society of Industrial Information Systems
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• v.15 no.4
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• pp.1-5
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• 2010

To operate safely VANET applications, authenticaton is necessary to identify val d participants and prevent malicious parties from modifying messages. This paper proposes an efficient authentication protocol for the vehicle registration in VANET environment. The topology of VANET changes rapidly due to high-speed movement of vehicles, thus it is need to reduce the computational burden of the authentication protocol. Therefore, this protocol uses only one-way hash functions and EOR operations to register vehicles.

• Journal of Korea Multimedia Society
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• v.7 no.12
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• pp.1708-1718
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• 2004

In this paper, we are concerned with a digital fingerprinting scheme for multi-purchase where a buyer wants to buy more than a digital content. If we apply previous schemes to multi-purchase protocol, the number of execution of registration step and decryption key should be increased in proportion to that of digital contents to be purchased in order to keep unlinkability. More worse, most of fingerprinting schemes in the literature are based on either secure multi-party computation or general zero-knowledge proofs with very high computational complexity. These high complexities complicate materialization of fingerprinting protocol more and more. In this paper, we propose a multi-purchase fingerprinting scheme with lower computational complexity. In the proposed scheme, a buyer executes just one-time registration step regardless of the number of contents to be purchased. The number of decryption key is constant and independent of the number of contents to be purchased. We can also reduce the computational costs of buyers by introducing a concept of proxy-based fingerprinting protocol.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.5B
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• pp.466-474
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• 2003

In this paper, we develope the simulation model for Ethernet passive optical networks (Ethernet-PON) by using OPNET. Ethernet-PON is an emerging access network technology that provides a low-cost method of deploying optical access lines. The simulator uses a Request/Grant TDMA MAC protocol based on IEEE 802.3ah EFM. It also executes registration, ranging and dynamic bandwidth allocation algorithm by exchanging control packets between OLT and ONUs. We have evaluated for success ratio of initial registration process and delay of late registration process. We also have simulated for dynamic TDMA protocol and static TDMA protocol in terms of channel utilization and queueing delay. We expect that this simulator can help to determine various parameters which are considered for designing Ethernet-PON system.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11b
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• pp.1061-1064
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• 2003

SIP(Session Initiation Protocol) 기반의 VoIP(Voice over IP) 시스템의 구성 요소에서 레지스트라(Registrar)는 사용자들의 Registration 정보들을 저장 및 관리하는 역할을 한다. 네트워크상에서 이 Registration 상태는 관리자의 정책 등에 따라 동적으로 변화하게 되므로 사용자는 변경는 상태 정보를 알 필요성이 생긴다. Registration Event Package는 UA(User Agent)가 Subscriber로서 Registration 상태의 변경에 대한 통지를 요청할 수 있고 알림(Notification)을 통해 얻을 수 있는 매커니즘를 제공한다. 본 논문에서는 SIP 환경에서 이러한 Registration Event Package를 구현하여 사용자가 동적으로 변화되는 Registration 상태 정보를 알림을 통해 받을 수 있도록 하였다.

• The KIPS Transactions:PartC
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• v.9C no.2
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• pp.267-276
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• 2002

By using wireless terminal, User that want to transmit multimedia traffic as well as simple text and voice have a tendency to increase. This paper proposes a fast handoff protocol that is suitable transmission for real-tim of multimedia traffic by using modified local registration. The proposed protocol solves the Triangle Routing Protocol that is one of existing opened issues without modifying protocol of CN, and we propose the method that MN is able to received a packet by real-time, even if MN is being handoff. We compare fast handoff protocol proposed in this paper with existing method n the registration cost and data packet transmission cost. As a result, we showed that fast handoff protocol proposed in this paper outperforms existing method.