Peer-to-peer computing has emerged as a significant paradigm for providing distributed services, in particular collaboration for content sharing and distributed computing. However, this computing paradigm suffers from several drawbacks that obstruct its wide adoption. Lack of trust between peers is one of the most serious issues, which causes security challenges in the P2P systems. This paper s...

The objective of load balancing in peer-to-peer (P2P) networks is to balance the workload of peer nodes in proportion to their capacity so as to eliminate performance bottlenecks. It is challenging because of the dynamic nature in overlay networks, the time-varying load characteristics, and the inherent load imbalance caused by consistent hashing functions. It is known that simple randomized lo...

Various kinds of distributed systems gain much attention in recent years. One of the most significant example is the Peer-to-Peer (P2P) paradigm widely used in many applications including: file-sharing systems (e.g. BitTorrent), computing systems (e.g. SETI@home), communication systems (e.g. Skype) and many others. In this work we present our latest research related to the problem of P2P-based ...

Assessing the performance of peer-to-peer algorithms such as topology construction protocols, distributed trust or search algorithms is impossible without simulations since testing new algorithms by deploying them in an existing P2P network is prohibitively expensive. However, some P2P algorithms are sensitive to the network and traffic models that are used in the simulations. In order to produ...

In recent years, Peer-to-Peer (P2P) systems and computational Grids are evolving into a new distributed computing model, called P2P Grid. This paper presents a new approach to solving the trust and security problems in a P2P Grid. Establishing trust in P2P Grids is essential to build lasting working relationships among the peers joining collective Grid applications. A P2P reputation system is t...

Peer-to-Peer (P2P) received significant attention from both industry and academia as a version of distributed computing lying between traditional distributed systems and the web. P2P found lots of its application in file sharing systems, distributed computations, instant messaging systems and so on. Database community investigates P2P as a new decentralized paradigm for distributed management o...

Motivated by the need for robust and fast distributed computation in highly dynamic Peer-toPeer (P2P) networks, we study algorithms for the fundamental distributed agreement problem. P2P networks are highly dynamic networks that experience heavy node churn (i.e., nodes join and leave the network continuously over time). Our goal is to design fast algorithms (running in a small number of rounds)...

In this paper, we propose and study the behavior of a number of peer-to-peer (P2P )-based distributed computing systems in order to offer efficient and reliable media services over a large-scale heterogeneous network of computing nodes. Our proposed middleware architectures exploit features including availability of high-performance links to networks, usage of exclusive and partial indexing in ...

Peer-to-Peer (P2P) computing is a recent hot topic in the areas of networking and distributed systems. Work on P2P computing was triggered by a number of ad-hoc systems that made the concept popular. Later, academic research efforts started to investigate P2P computing issues based on scientific principles. Some of that research produced a number of structured P2P systems that were collectively...

Internet security today is based almost entirely on a public key infrastructure that allows authentication and encryption of data. However this PKI heavily relies on central institutions, namely the Certification Authorities (CAs), that issue certificates. In pure P2P networks such central instances are unwanted because they contradict the P2P paradigms. In this paper, we describe how a Certifi...