Search results for "Reputation"
showing 10 items of 153 documents
A Simulation Software for the Evaluation of Vulnerabilities in Reputation Management Systems
2019
Multi-agent distributed systems are characterized by autonomous entities that interact with each other to provide, and/or request, different kinds of services. In several contexts, especially when a reward is offered according to the quality of service, individual agents (or coordinated groups) may act in a selfish way. To prevent such behaviours, distributed Reputation Management Systems (RMSs) provide every agent with the capability of computing the reputation of the others according to direct past interactions, as well as indirect opinions reported by their neighbourhood. This last point introduces a weakness on gossiped information that makes RMSs vulnerable to malicious agents’ intent …
REPUTATION MANAGEMENT ALGORITHMS IN DISTRIBUTED APPLICATIONS
2020
Nowadays, several distributed systems and applications rely on interactions between unknown agents that cooperate in order to exchange resources and services. The distributed nature of these systems, and the consequent lack of a single centralized point of control, let agents to adopt selfish and malicious behaviors in order to maximize their own utility. To address such issue, many applications rely on Reputation Management Systems (RMSs) to estimate the future behavior of unknown agents before establishing actual interactions. The relevance of these systems is even greater if the malicious or selfish behavior exhibited by a few agents may reduce the utility perceived by cooperative agents…
Vulnerability evaluation of distributed reputation management systems
2017
In distributed environments, Reputation Management Systems (RMSs) aim to estimate agents' trustworthiness by exploiting different sources of information. The distributed nature of these systems makes them vulnerable to several types of security attacks, and the response provided by a specific RMS depends on various factors, such as the algorithms adopted for estimating the reputation values and the communication protocols used to enable the cooperation among agents. This work examines the most important security attacks against RMSs and proposes a set of metrics for a quantitative evaluation of the RMS vulnerabilities. A parallel simulation framework is used to automatically give a vulnerab…
An extended JADE-S based framework for developing secure Multi-Agent Systems
2009
Agent communities are self-organized virtual spaces consisting of a large number of agents and their dynamic environments. Within a community, agents group together offering special e-services for effective, reliable, and mutual benefits. Usually, an agent community is composed of specialized agents performing one or more tasks in a single domain/sub-domain, or in highly intersecting domains. However, secure Multi- Agent Systems require severe mechanisms in order to prevent malicious attacks. Several limits affect exiting secure agents platform, such as the lack of a strong authentication system, the lack of a flexible distributed mechanism for access control and the lack of a system for st…
Reputation Management for Distributed Service-Oriented Architectures
2010
Nowadays, several network applications require that consumer nodes acquire distributed services from unknown service providers on the Internet. The main goal of consumer nodes is the selection of the best services among the huge multitude provided by the network. As basic criteria for this choice, service cost and Quality-of-Service (QoS) can be considered, provided that the underlying Service-Oriented Architecture (SOA) be augmented in order to support the declaration of this information. The correct behavior of such new SOA platforms, however, will depend on the presence of some mechanisms that allow consumer nodes to evaluate trustworthiness of service providers. This work proposes a new…
Reputazione, fiducia e mercati
2016
In the last years ex ante monitoring tools based on digital “reputation” are developing very fast gaining a crucial role in in global markets. Based on technologies that enable information about individuals’ actions and reputations to circulate within a specific context, these systems help building trust by diminishing asymmetric information. Since they create rewards and sanctions, reputational systems significantly improve decision-making by consumers and help developing well-functioning markets, lessening the need for regulatory oversight, but also generate new problems and challenges. Manipulation and gaming may provide less than accurate information, resulting in reputational harms, ge…
Peer Reputation Configurations and Associations with Friendship Adjustment
2023
Peer reputation (PR) refers to how peer groups collectively view an individual in terms of socio-behavioral characteristics, such as aggression, social withdrawal, leadership, and prosociality. Despite considerable research on PR, few studies have considered PRs in relation to indices of friendship, particularly with a person-centered approach. The goal of the current study was to adopt such an approach and identify peer reputation configurations and their defining characteristics, and to examine how such configurations are linked to friendship prevalence and quality. Four hundred and twenty-six Italian seventh-grade students (57.3% male, M-age = 12.07) completed peer nomination measures of…
Navigating multiple logics: Legitimacy and the quest for societal impact in science
2022
Academic scientists are encouraged to pursue research that delivers both scientific and societal impact. This may involve a search for alternative mechanisms of social approval which lead to endorsement of scientists’ research goals. We explore how scientists mobilise and accumulate different forms of legitimacy, which might favour their participation in practices related to innovation and societal impact. We propose three specific sources of scientific legitimacy: i) scientists’ social networks (research-related legitimacy ties), ii) prominence in the relevant academic community (reputation-based legitimacy); and direct contact with the primary beneficiaries of the research (beneficiary-ba…
A firm's activity in social media and its relationship with corporate reputation, firm size and firm performance
2015
The significance of social media has increased greatly in the past few years, leading companies to increase their social media activity and also increase their interest in knowing whether it is genuinely worth being active on social media, including knowing the potential advantages. This study aims to examine the relationship between social media activity and three variables: reputation, firm size and firm performance. The study analyzes the relationships between the constructs but does not propose or discuss the direction, that is, the causal linkages, between the variables. The type of research conducted for this study is quantitative research; it is based on data that are collected from …
European comission's identity during brexit : a communication strategy change on twitter
2021
The European Union (EU) was founded to promote peace, prosperity and other values between an increasing number of member states (European Commission, 2001). However, Brexit has activated a reputation crisis that reinforces Euroscepticism (Borzel; Risse, 2018). The objective of the study is to identify the differences in the semantic construction and thematic framing of the European Commission during a two-year period, previous to Brexit and after Brexit, on a sample of 4827 tweets posted by the European Commission. Findings show that in the period before Brexit, the EU is presented as an abstract political body, highly informative on major crisis, and reactively framing messages with values…