Advances in Multimedia

Retracted: Enhanced P2P Services Providing Multimedia Content

Yi Cui

Ben Y. Zhao

S. Chen

Toward the Next-Generation Peer-to-Peer Services

Peer-to-peer (P2P) systems are becoming a popular means of streaming audio and video content but they are prone to bandwidth starvation if selfish peers do not contribute bandwidth to other peers. We prove that an incentive mechanism can be created for a live streaming P2P protocol while preserving the asymptotic properties of randomized gossip-based streaming. In order to show the utility of our result, we adapt a distributed incentive scheme from P2P file storage literature to the live streaming scenario. We provide simulation results that confirm the ability to achieve a constant download rate (in time, per peer) that is needed for streaming applications on peers. The incentive scheme fairly differentiates peers&#x27; download rates according to the amount of useful bandwidth they
contribute back to the P2P system, thus creating a powerful quality-of-service incentive for peers to contribute bandwidth to other peers. We propose a functional architecture and protocol format for a gossip-based streaming system with incentive mechanisms, and present evaluation data from a real implementation of a P2P streaming application.

Sachin Agarwal

Jatinder Pal Singh

Shruti Dube

Analysis and Implementation of Gossip-Based P2P Streaming with Distributed Incentive Mechanisms for Peer Cooperation

The architecture of P2P file-sharing applications has been developing to meet the needs of large scale demands. The structured overlay network, also known as DHT, has been used in these applications to improve the scalability, and robustness of the system, and to make it free from single-point failure. We believe that the measurement study of the 
overlay network used in the real file-sharing P2P systems can provide guidance for the designing of such systems, and improve the performance of the system. In this paper, we perform the measurement in two different aspects. First, a modified client is designed to provide view to the overlay network from a single-user vision. Second, the instances 
of crawler programs deployed in many nodes managed to crawl the user information of the overlay network as much as possible. We also find a vulnerability in the overlay network, combined with the character of the DNS service, a more serious DDoS attack can be launched.

Mo Zhou

Yafei Dai

Xiaoming Li

A Measurement Study of the Structured Overlay Network in P2P File-Sharing Systems

Unstructured peer-to-peer networks have gained a lot of popularity
due to their resilience to network dynamics. The core operation in
such networks is to efficiently locate resources. However, existing
query schemes, for example, flooding, random walks, and interest-based
shortcut suffer various problems in reducing communication
overhead and in shortening response time. In this paper, we study the
possible problems in the existing approaches and propose a new
hybrid query scheme, which mixes inter-cluster queries and
intracluster queries. Specifically, the proposed scheme works by
efficiently locating the clusters, sharing similar interests with
intercluster queries, and then exhaustively searching the nodes in
the found clusters with intracluster queries. To facilitate the
scheme, we propose a clustering algorithm to cluster nodes that
share similar interests, and a labeling algorithm to explicitly
capture the clusters in the underlying overlays. As demonstrated by
extensive simulations, our new query scheme can improve the system
performance significantly by achieving a better tradeoff among
communication overhead,  response time, and ability to locate more
resources.

Zhan  Zhang

Yong  Tang

Shigang  Chen

Ying  Jian

A Hybrid Query Scheme to Speed Up Queries in Unstructured Peer-to-Peer Networks

Reputation systems help establish social control in peer-to-peer networks. To be truly effective, however, a reputation system should counter attacks that compromise the reliability of user ratings. Existing reputation approaches either average a peer&#x27;s lifetime ratings or account for rating credibility by weighing each piece of feedback by the reputation of its source. While these systems improve cooperation in a P2P network, they are extremely vulnerable to unfair ratings attacks. In this paper, we recommend that reputation systems decouple a peer&#x27;s service provider reputation from its service recommender reputation, thereby, making reputations more resistant to tampering. We propose a scalable approach to system-wide decoupled service and feedback reputations and demonstrate the effectiveness of our model against previous nondecoupled reputation approaches. Our results indicate that decoupled approache significantly improves reputation accuracy, resulting in more successful transactions. Furthermore, we demonstrate the effectiveness and scalability of our decoupled approach as compared to PeerTrust, an alternative mechanism proposed for decoupled reputations. Our results are compiled from comprehensive logs collected from Maze, a large file-sharing system with over 1.4 million users supporting searches on 226TB of data.

Gayatri Swamynathan

Kevin C. Almeroth

Haitao Zheng

Globally Decoupled Reputations for Large Distributed Networks

The retrieval facilities of most Peer-to-Peer (P2P) systems are limited to queries based on unique identifiers or small sets of keywords. Unfortunately, this approach is very inadequate and inefficient when a huge amount of multimedia resources is shared.
To address this major limitation, we propose an original image and video sharing system, in which a user is able to interactively search interesting resources by means of content-based image and video retrieval techniques. In order to limit the network traffic load, maximizing the usefulness of each peer contacted in the query process, we also propose the adoption of an adaptive overlay routing algorithm, exploiting compact representations of the multimedia resources shared by each peer. Experimental results confirm the validity of the proposed approach, that is capable of dynamically adapting the network topology to peer interests, on the basis of query interactions among users.

E. Ardizzone

L. Gatani

M. La Cascia

G. Lo Re

M. Ortolani

[Retracted] Enhanced P2P Services Providing Multimedia Content

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Advances in Multimedia publishes research on the technologies associated with multimedia systems, including computer-media integration for digital information processing, storage, transmission, and representation.

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Advances in Multimedia publishes research on the technologies associated with multimedia systems, including computer-media integration for digital information processing, storage, transmission, and representation.

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Advances in Multimedia

Toward the Next-Generation Peer-to-Peer Services

Toward the Next-Generation Peer-to-Peer Services

Articles

Retracted: Enhanced P2P Services Providing Multimedia Content

Toward the Next-Generation Peer-to-Peer Services

Analysis and Implementation of Gossip-Based P2P Streaming with Distributed Incentive Mechanisms for Peer Cooperation

A Measurement Study of the Structured Overlay Network in P2P File-Sharing Systems

A Hybrid Query Scheme to Speed Up Queries in Unstructured Peer-to-Peer Networks

Globally Decoupled Reputations for Large Distributed Networks

[Retracted] Enhanced P2P Services Providing Multimedia Content