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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The KIPS Transactions:PartC
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Korea Information Processing Society
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Volume & Issues
Volume 14C, Issue 7 - Dec 2007
Volume 14C, Issue 6 - Oct 2007
Volume 14C, Issue 5 - Aug 2007
Volume 14C, Issue 4 - Aug 2007
Volume 14C, Issue 3 - Jun 2007
Volume 14C, Issue 2 - Apr 2007
Volume 14C, Issue 1 - Feb 2007
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Mediated ID based signature scheme and key updating signature scheme
Ju, Hak-Soo ; Kim, Dae-Youb ;
The KIPS Transactions:PartC, volume 14C, issue 6, 2007, Pages 463~470
DOI : 10.3745/KIPSTC.2007.14-C.6.463
Revocation is one of the main difficulties faced in implementing Public Key Infrastructures(PHs). Boneh, Ding and Tsudik first introduced a mediated cryptography for obtaining immediate revocation of RSA keys used in PKIs. Their method is based on the idea that each user`s private key can be split into two random shares, one of which is given to the user and the other to an online security mediator(SEM). Thus any signature or decryption must be performed as a cooperation between a user and his/her associated SEM and revocation is achieved by instructing the mediator SEM to stop cooperating the user. Recently, Libert and Quisquater showed that the fast revocation method using a SEcurity Mediator(SEM) in a mRSA can be applied to the Boneh-Franklin identify based encryption and GDH signature schemes. In this paper we propose a mediated identity based signature(mIBS) with batch verification which apply the SEM architecture to an identity based signature. Libert`s GDH siganture scheme is not forward secure even though forward security is an important and desirable feature for signature schemes. We propose an efficient key udating mediated signature scheme, mKUS based on mIBS and analyze its security and efficiency.
One Variant of Diffie-Hellman Key Exchange Protocol
Nyang, Dae-Hun ; Lee, Kyung-Hee ;
The KIPS Transactions:PartC, volume 14C, issue 6, 2007, Pages 471~474
DOI : 10.3745/KIPSTC.2007.14-C.6.471
In this paper, we propose a variant of Diffie-Hellman key exchange protocol to provide pre-computable session key and to give another version of Diffie-Hellman key exchange protocol that might be useful in designing more sophisticated cryptographic protocols. We prove the security of the key exchange protocol by reducing DH key exchange protocol to ours.
Dynamic ATIM Power Saving Mechanism(DAPSM) in 802.11 Ad-Hoc Networks
Park, Jae-Hyun ; Lee, Jang-Su ; Kim, Sung-Chun ;
The KIPS Transactions:PartC, volume 14C, issue 6, 2007, Pages 475~480
DOI : 10.3745/KIPSTC.2007.14-C.6.475
Recently, wireless networking devices that depend on the limited Battery and power-saving of wireless hosts became important issue. Batteries can provide a finite amount of energy, therefore, to increase battery lifetime, it is important to design techniques to reduce energy consumption by wireless hosts. This paper improved power saying mechanism in Distributed Coordination Function(DCF) of IEEE 802.11. In the IEEE 802.11 power saving mechanism specified for DCF, time is divided into so-called beacon intervals. At the start of each beacon interval, each node in the power saving mode periodically wakes up during duration called the ATIM Window. The nodes are required to be synchronized to ensure that all nodes wake up at the same time. During the ATIM window, the nodes exchange control packets to determine whether they need to stay awake for the rest of the beacon interval. The size of the ATIM window has considerably affected power-saving. This paper can provide more power-saving than IEEE 802.11 power saving mode because ATIM window size is efficiently increased or decreased.
Design and Implementation of a Multipoint VoIP in Ubiquitous Environment
Seong, Dong-Su ; Lee, Sung-Min ;
The KIPS Transactions:PartC, volume 14C, issue 6, 2007, Pages 481~492
DOI : 10.3745/KIPSTC.2007.14-C.6.481
The ubiquitous environment allows users to communicate with others and to have access to computing service any time, any place. Multipoint VoIP is expected to be one of the loading applications in this environment. The paper compares various conference models for efficient VoIP service in ubiquitous environment and shows why the endpoint mixing model performs effectively in this environment. However, the endpoint mixing model has its own drawbacks as well and we propose solutions to solve the problems.
A Design of Handoff-aware DiffServ Scheduler in TDD/CDMA Networks
Zang, Seog-Ku ; Kim, Young-Han ;
The KIPS Transactions:PartC, volume 14C, issue 6, 2007, Pages 493~502
DOI : 10.3745/KIPSTC.2007.14-C.6.493
In this paper, we propose a handoff-aware DiffServ scheduler which intends to guarantee various QoS requirements of multimedia services for mobile nodes in TDD/CDMA based wireless networks. TDD is widely used duplexing mechanism in wireless communications. Unlike FDD, TDD allows a node to symmetrically communicate with a base station by using a single frequency band, resulting in high utilization of wireless resources. DiffServ is regarded as a relatively simple QoS support mechanism and thus it is easy to be extended. This is because DiffServ is not a per-flow based mechanisms and it does not require any signaling protocol. However, previously proposed DiffServ schedulers for wired networks can not be deployed directly into wireless networks since they do not consider properties of wireless networks. As a solution to the problem, DSS(DiffServ Supporting Scheduler) was proposed. DSS uses uplink channel, which is originally used for a node to require a base station to transmit packets, to support QoS efficiently. However, QoS does not consider handoff so that it can not support QoS for moving nodes from one cell to the other cell. Therefor. the proposed handoff support QoS mechanism is necessary for TCC/CDMA networks. The proposed scheme allows a mobile node to achieve seamless service without QoS degradation even for the handoff duration.
Unproved Fast Handover Protocol using HMIPv6 based on IEEE 802.16e Network
Koo, Gyo-Du ; Mun, Young-Song ;
The KIPS Transactions:PartC, volume 14C, issue 6, 2007, Pages 503~508
DOI : 10.3745/KIPSTC.2007.14-C.6.503
Since the Wibro service realize mobile network on the public, it has been considered that it is not enough to support real time service at vehicular speed. The standard Fast Mobile IPv6 Handover Protocol using HMIPv6 may guarantee seamless service as long as the Mobile Node moves in the same domain MAP however it does not regard fast handover over inter-MAP domain. Thus Macro Mobility Handover in HMIPv6 was proposed to reduce handover latency in inter-MAP domain. But it is still not enough to support real-time service. So we propose an Improved FHMIPv6 over 802.16e network to reduce the overall handover latency. We embedded Layer 3 handover messages of the FHMIPv6 into the Layer 2 handover messages. So the MN is able to
overall handover procedure earlier in our scheme. The numerical results show the performance of IFHMIPv6 has improved about 32% in comparison with FHMIPv6.
Jabber Messenger for a WebDAV-based Collaborative System
Lee, Hong-Chang ; Park, Jin-Ho ; Kim, Seong-Hune ; Lee, Myung-Joon ;
The KIPS Transactions:PartC, volume 14C, issue 6, 2007, Pages 509~518
DOI : 10.3745/KIPSTC.2007.14-C.6.509
Jakarta Slide is a WebDAV server developed as one of Apache projects, which supports asynchronous authoring for various contents on the server. Unfortunately, since the WebDAV protocol does not explicitly provide the workspaces for user groups, it is difficult to support complicated collaboration using Jakarta Slide. The CoSlide system is an extension of Jakarta Slide to address this problem, presenting more effective collaborative environment by providing various workspaces for group collaboration. In this paper, we describe the CoJBother Messenger for the CoSlide collaborative system. We developed CoJBother by extending the JBother messenger based on the standard Jabber protocol. To support the users and groups defined on the CoSlide system, we also extended the Jabber protocol. CoJBother shows the information on the CoSlide users and groups in addition to the standard Jabber users and groups. In particular, through CoJBother, the members of a group on CoSlide can initiate group chatting without any administrative overhead.
Dynamic-size Multi-hop Clustering Mechanism based on the Distance in Sensor Networks
Ahn, Sang-Hyun ; Lim, Yu-Jin ;
The KIPS Transactions:PartC, volume 14C, issue 6, 2007, Pages 519~524
DOI : 10.3745/KIPSTC.2007.14-C.6.519
One of the most important issues on the sensor network with resource limited sensor nodes is prolonging the network lifetime by effectively utilizing the limited node energy. The most representative mechanism to achieve a long lived sensor network is the clustering mechanism which can be further classified into the single hop mode and the multi hop mode. The single hop mode requires that all sensor nodes in a cluster communicate directly with the cluster head(CH) via single hop md, in the multi hop mode, sensor nodes communicate with the CH with the help of other Intermediate nodes. One of the most critical factors that impact on the performance of the existing multi hop clustering mechanism is the cluster size and, without the assumption on the uniform node distribution, finding out the best cluster size is intractable. Since sensor nodes in a real sensor network are distributed non uniformly, the fixed size mechanism may not work best for real sensor networks. Therefore, in this paper, we propose a new dynamic size multi hop clustering mechanism in which the cluster size is determined according to the distance from the sink to relieve the traffic passing through the CHs near the sink. We show that our proposed scheme outperforms the existing fixed size clustering mechanisms by carrying out numerical analysis and simulations.
The Performance Analysis of A High-speed Mechanism for SNMP Connection Management in Centralized Network Control Platform
Ko, Young-Suk ; Kwon, Tae-Hyun ; Kim, Choon-Hee ; Nam, Hyun-Soon ; Jeong, You-Hyeon ; Cha, Young-Wook ;
The KIPS Transactions:PartC, volume 14C, issue 6, 2007, Pages 525~536
DOI : 10.3745/KIPSTC.2007.14-C.6.525
Network Control Platform(NCP) and Qualify of Service Switch(QSS) are being developed to realize centralized control and management technology, which is essential for guaranteeing traffic engineering and service quality in a next generation network. This paper adopts a parallel mechanism, and a thread and object pool to achieve high-speed connection management in the existing SNMP interface between NCP and QSS. We built up a connection management test-bed in laboratory environment to validate the functionality of high-speed connection management. We also measured and analyzed a performance of connection setup delay and a completion ratio using the test-bed. We ascertain that the parallel mechanism and the object pool are the most important performance parameters to achieve high-speed connection management in the SNMP interface between NCP and QSS.
Design and Safety Analysis of a Role-Based Access Control Framework for Mobile Agents in Home Network Environments
Jung, Young-Woo ; Ko, Kwang-Sun ; Kim, Gu-Su ; Eom, Young-Ik ;
The KIPS Transactions:PartC, volume 14C, issue 6, 2007, Pages 537~544
DOI : 10.3745/KIPSTC.2007.14-C.6.537
A home network is a residential local area network in which digital home appliances are connected with each other. Applying the mobile agent technology to the home network is expected to provide a new computing model. In particular, mobility and asynchronous ability of mobile agent can be used to reduce network traffic generated for managing home appliances. However, in order to apply the mobile agent concept to the home network, access control for mobile agents is necessary. In the existing home network system, there is one special server, sometimes called home server This server generally has mapping tables to be updated periodically, which describes access control lists between users` authorities and corresponding devices. In this paper, we propose a role-based access control framework with mobile agents in home networks. This framework, called Secure KAgent framework, is designed and implemented based on KAgent system. It has two main characteristics: to control access permissions based on Role-Based Access Control(RBAC) scheme and to safety assign roles to mobile agents by role tickets.