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IEEE Asia-Pacific Conference on services computing (APSCC)

作者： Yunfa Li Xiangha Xu Jian Wan Hai Jin Zongfen Han Services Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Hangzhou Dianzi University Hangzhou Zhejiang CN

In traditional grid, grid user can not validate whether grid service registered in grid platform can execute correctly or not because the system does not provide the measurement mechanism for grid service. In order to solve this problem, we propose a series of strategies and methods for trusted grid. These strategies and methods include: an access control policy for reference database, an integrity attestation for reference datasheet, a construction method of reference datasheet, a trusted storage algorithm of reference datasheet and a report algorithm of reference datasheet. All these constitute the measurement mechanism of service for trusted grid. Some experiments are done in order to validate the feasibility and the availability of this mechanism. The results show that it is feasible and efficient to validate whether grid service registered in trusted grid platform can execute correctly or not.

关键词： Distribution strategy grid computing Information security Centralized control technology management Computer science Character generation Large-scale systems Distributed computing Conference management

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A Prioritized Chinese Wall Model for Managing the Covert Information Flows in Virtual Machine systems

A Prioritized Chinese Wall Model for Managing the Covert Inf...

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The 9th International Conference for Young Computer Scientists(第九届国际青年计算机大会)

作者： Ge Cheng Hai Jin Deqing Zou Alex K. Ohoussou Feng Zhao Service Computing Technology and System Lab Cluster and Grid Computing Lab School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

In virtual machine (VM) systems, mandatory access control (MAC) enforcement is possible now. This technique is both stronger and more flexible than traditional VM isolation, even if network communication is controlled. Unfortunately all of the VM systems with the MAC enforcement does not consider that the MAC controls may be distorted by covert channels, which constitute an important risk in VM systems. Traditional MAC models have difficulties being enforced to reduce the risk of covert flows in VM systems due to the many constraints and the lack of flexibility. In this paper, we identify access control requirements for managing covert channels in VM systems through a critical analysis of the ways by which classical models constrain the covert information flows and we propose a model called the Prioritized Chinese Wall model (PCW) to reduce the risk of covert flows in VM systems while preserving the flexibility. Furthermore, we enforce the policy in sHype/Xen VM system.

关键词： Information management Virtual machining Virtual manufacturing Communication system control Control systems Risk management Access control Hardware grid computing Isolation technology

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A multicast based bandwidth saving approach for wireless live streaming system

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International Journal of Smart Home 2008年第1期2卷 65-80页

作者： Jiang, Wenbin Jin, Hai Liao, Xiaofei Yuan, Zhi Services Computing Technology and System Lab Huazhong University of Science and Technology Wuhan 430074 China Cluster and Grid Computing Lab Huazhong University of Science and Technology Wuhan 430074 China School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

P2P based live streaming applications are growing up rapidly. However, when extending them to WLANs, the bandwidth bottleneck and the high rate of packet loss are usually the major stumbling blocks. To overcome this issue, a new wireless multicast agent mechanism (WiMA) based on the IP multicast scheme for buffer management and scheduling is proposed. First of all, a wireless agent selection method is presented to choose an appropriate agent for WiMA. Then this agent gains media data by interacting with wired neighbor peers as a common P2P node, and transmits these data to other wireless peers in the WLAN by means of multicast pushing and multicast patching. A normal wireless peer requests data according to the strategy of "emergent ones first". Experimental results show that the approach proposed can significantly save bandwidth in WLANs with acceptable start delay and satisfied playing continuity.

关键词： Wireless local area networks (WLAN)

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Information Value Evaluation Model for ILM

Information Value Evaluation Model for ILM

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ACIS International Conference on Software Engineering, Artificial Intelligence, Networking, and Parallel/Distributed computing (SNPD)

作者： Hai Jin Muzhou Xiong Song Wu Services Computing Technology and System Lab Huazhong University of Science and Technology Wuhan China Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9780769532639

The first step towards the information lifecycle management is to differentiate information by values. This paper presents an evaluation model for information value. The idea of the model is from commodity value discipline in economic area. The output of information value evaluation model is determined by information itself which is like commodity price is determined by use-value in economic area. The output of the model is changed around the real information value and controlled by the relationship between information supply and demand. The output of the model is determined by factors from three aspects that are information itself, information supply, and information demand. When applying the model into traditional information management approaches, such as replication, data migration, and backup, those mechanisms control the output of the model through adjusting the ability of information supply.

关键词： Biological system modeling Supply and demand Computational modeling Bandwidth Data models Economics Analytical models

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The Content Pollution in Peer-to-Peer Live Streaming systems: Analysis and Implications

The Content Pollution in Peer-to-Peer Live Streaming Systems...

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International Conference on Parallel Processing (ICPP)

作者： Sirui Yang Hai Jin Bo Li Xiaofei Liao Hong Yao Xuping Tu Services Computing Technology and System Laboratory Cluster and Grid Computing Laboratory School of Computer Science and Technology Huazhong University of Science and Technology China Department of Computer Science Hong Kong University of Science and Technology Hong Kong China

ISBN: (纸本)9781424432134

There has been significant progress in the development and deployment of peer-to-peer (P2P) live video streaming systems. However, there has been little study on the security aspect in such systems. Our prior experiences in Anysee exhibit that existing systems are largely vulnerable to intermediate attacks, in which the content pollution is a common attack that can significantly reduce the content availability, and consequently impair the playback quality. This paper carries out a formal analysis of content pollution and discusses its implications in P2P live video streaming systems. Specifically, we establish a probabilistic model to capture the progress of content pollution. We verify the model using a real implementation based on Anysee system; we evaluate the content pollution effect through extensive simulations. We demonstrate that (1) the number of polluted peers can grow exponentially, similar to random scanning worms. This is vital that with 1% polluters, the overall system can be compromised within minutes; (2) the effective bandwidth utilization can be sharply decreased due to the transmission of polluted packets; (3) Augmenting the number of polluters does not imply a faster progress of content pollution, in which the most influential factors are the peer degree and access bandwidth. We further examine several techniques and demonstrate that a hash-based signature scheme can be effective against the content pollution, in particular when being used during the initial phase.

关键词： Pollution Peer to peer computing Bandwidth Streaming media Availability Grippers Topology

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Ripple: Toward a Substrate Middleware for Peer-to-Peer Applications

Ripple: Toward a Substrate Middleware for Peer-to-Peer Appli...

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International Conference on Innovative computing, Information and Control (ICICIC)

作者： Hong Yao Linchen Yu Hai Jin Sirui Yang Qi Huang Wenjian Jiang Cluster and Grid Computing Laboratory Services Computing Technology and System Laboratory Huazhong University of Science and Technology Wuhan China School of Computer Science and Technology China University of Geoscience Wuhan China France Telecom Research and Development Center Beijing China

Peers in multiple P2P applications execute overlapped operations with different implementation, like neighbour management, resource publish/lookup, delay investigation, which leads to poor interoperability and unnecessary network load. Peers contribute their resources only when they stay in same application. We propose a P2P middleware, called Ripple, to accomplish common functions in a layered architecture. Ripple manages all peers running various applications in a uniform substrate overlay network. The substrate overlay is designed with a hybrid topology. This hybrid topology does not aim at only a particular type of applications, but also enables the flexibility for various applications. Our work is an attempt to address common needs of P2P applications, which may simplify the development and improve the performance of P2P networks, as well as mitigate the sampling stress to physical networks.

关键词： Peer to peer computing Delay Tin Topology Indexes Substrates Network topology

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grid Maintenance: Challenges and Existing Models

Grid Maintenance: Challenges and Existing Models

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3rd International Conference on Information and Communication Technologies, vol.4

作者： Shadi Ibrahim Hai Jin Li Qi Chunqiang Zeng Cluster and Grid Computing Laboratory Services Computing Technology and System Laboratory Huazhong University of Science and Technology Wuhan China

As the world of grid computing is continuously growing, scalability and complexity of grid systems are in an increasing rate. Moreover, grid systems are dynamic and subject to various changes. Management of such changes is a challenging issue facing grid communities. Namely, how to efficiently maintain grid system to adopt the environment modification, to meet the user demands and to manage the dynamic changes has become a big challenge. Manual- or script based maintenance approaches are tedious, time consuming and complex, in addition to being highly prone to errors. Therefore, state-of-the-art maintenance models are designed to support transparent runtime maintenance, fast and comprehensive respond to environmental changes and requirements, consequently, improve the availability and efficiency of the grid system. This paper focuses on investigating maintenance models and their common characteristics for grid. To this end, this paper surveys several representative grid maintenance model systems developed by various projects worldwide. The contributions of this paper are (i) discussing the motivations of maintenance for grid system, (ii) discussing the issues and the challenges in building maintenance mechanisms for grid system, (iii) reviewing maintenance models and compare their efficiencies for grid system, and (iv) discussing possible new directions.

关键词： grid computing Maintenance Dependecy Efficiency Inconsistency

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Discourage free riding in Peer-to-Peer file sharing systems with file migration and workload balancing approach

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中国高等学校学术文摘·计算机科学 2007年第4期1卷 436-449页

作者： YU Yijiao JIN Hai Services Computing Technology and System Lab Cluster and Grid Computing LabHuazhong University of Science and TechnologyWuhan 430074China

Free riding is a great challenge to the development and maintenance of Peer-to-Peer(P2P)networks.A file migration and workload balancing based approach (FMWBBA)to discourage free riding is proposed in this *** heart of our mechanism is to migrate some shared files from the overloaded peers to the neighboring free riders automatically and transparently,which enforces free riders to offer services when altruistic peers are heavily *** migration is a key issue in our approach,and some related strategies are discussed.A simulation is designed to verify this approach,and the results show that it can not only alleviate free riding,but also improve the Quality of Service(QoS)and robustness of P2P networks efficiently.

关键词： free riding free rider Peer-to-Peer(P2P)network file migration workload balancing Quality of Service(QoS)

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Survey on overcoming free riding in peer-to-peer networks

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Jisuanji Xuebao/Chinese Journal of Computers 2008年第1期31卷 1-15页

作者： Yu, Yi-Jiao Jin, Hai Key Laboratory of Services Computing Technology and System Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Cluster and Grid Computing of Hubei Province Huazhong University of Science and Technology Wuhan 430074 China

Since the first report of free riding on Gnutella in 2000, large amounts of network measurement results show that free riding is prevalent in almost all Peer-to-Peer (P2P) networks, which reduces the robustness, availability and lifetime of P2P networks. Overcoming free riding becomes a hot research issue both in academic and industrial communities. The traffic measurement mechanisms in P2P networks are overviewed, which include active measurement and passive measurement. Some detailed traffic measurement results of Gnutella overlay network are illustrated, which indicate the development of free riding in P2P network in recent 6 years. The modeling of P2P network is introduced, and the impacts to system performance of free riding are discussed. Moreover, the authors focus on the mechanisms avoiding free riding and categorize the proposed approaches into incentive mechanisms, game theoretical approaches, and social network or economic models based methods. Each category is discussed in detail, and some typical work is introduced. Especially, the features of these three categories of solutions are analyzed and compared from the aspect of engineering implementation, which is helpful to both the P2P software developers and academic researchers. Finally, future works about the mechanisms discouraging free riding in P2P networks are outlined.

关键词： Computer networks

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CMM :Credential Migration Management system based on trusted computing in CGSP

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中国高等学校学术文摘·计算机科学 2007年第2期1卷 200-207页

作者： JIN Hai YI Chuanjiang Services Computing Technology and System Lab Cluster and Grid Computing LabSchool of Computer Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China

In grid computing environment,grid users often *** the original user may be under the risk of information leakage and identity abused for sending his credential to remote computing *** grid security practice has few means to enforce the security of credential *** computing (TC) technology can be added to grid computing environment to enhance the grid *** TC using an essential in-platform (trusted)third party,Trusted Platform Module (TPM),we can use TC to protect the user *** this paper we present credential migration management (CMM) system,which is a part of Daonity project,to manifest migrating credential in security between different computers with TPM.

关键词： credential migration trusted computing grid computing Chinagrid Daonity

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