An important issue in P2P networks is the existence of malicious nodes that decreases the performance of such networks. Reputation system in which nodes are ranked based on their behavior, is one of the proposed solutions to detect and isolate malicious (low ranked) nodes. Gossip Trust is an interesting previously proposed algorithm for reputation aggregation in P2P networks based on t...

P2P reputation systems are useful to evaluate the trustworthiness of peers and to combat malicious and selfish peer behaviors. The reputation system assigns each peer a global reputation scores through collecting locally generated peer feedbacks and aggregation. In traditional reputation system, a peer will rate the other by a score, after finished a transaction, No more detail of transaction a...

With the extensive use of rating systems in the web, and their significance in decision making process by users, the need for more accurate aggregation methods has emerged. The Naïve aggregation method, using the simple mean, is not adequate anymore in providing accurate reputation scores for items, hence, several researches where conducted in order to provide more accurate alternative aggregat...

The most widely used reputation models assume uniform users’ preference structure. In this paper a new reputation management model is presented. It is focused on aggregation of community wide reputation in situation when agents do not share the same preference structure. The reputation is interpreted as vectors of attributes that represent several reputation evaluation criteria. Outcomes of the...

Perez, Carlos R. M.S.E.C.E., Purdue University, December, 2007. Reputation-based Resilient Data Aggregation in Sensor Network . Major Professor: Saurabh Bagchi. Data aggregation, or the fusing of many sensor measurements into a single summary, has been proposed as an important primitive in wireless sensor networks. But data aggregation is vulnerable to security attacks and natural failures wher...

In peer-to-peer networks, free riding is a major problem. Reputation management systems can be used to overcome this problem. Reputation estimation methods generally do not considers the uncertainties in the inputs. We propose a reputation estimation method using BLUE (Best Linear Unbiased estimator) estimator that consider uncertainties in the input variables. Reputation aggregation in peer to...

Virtual marketplaces on the web provide people with great facilities to buy and sell goods similar to conventional markets. In traditional business, reputation is subjectively built for known persons and companies as the deals are made in the course of time. As it is important to do business with trustful individuals and companies, there is a need to survive the reputation concept in virtual ma...

0140-3664/$ see front matter 2008 Elsevier B.V. A doi:10.1016/j.comcom.2008.07.017 * Tel.: +90 312 231 7400x2123; fax: +90 312 230 8 E-mail addresses: [email protected], suatoz In wireless sensor networks, compromised sensor nodes aim to distort the integrity of data by sending false data reports, injecting false data during data aggregation, and disrupting transmission of aggregated data...