Parameterisation of a reputation system for VoIP in P2P networks for improved communication quality and security

Document type: Conference Papers
Peer reviewed: No
Author(s): Markus Fiedler, Charlott Eliasson, Tomasz Ciszkowski, Wojciech Mazurczyk, Zbigniew Kotulski
Title: Parameterisation of a reputation system for VoIP in P2P networks for improved communication quality and security
Translated title: Parametrering av ett ryktessystem för VoIP i P2P nätverk för förbättrad kommunikationskvalitet och säkerhet
Conference name: EuroFGI IA.7.6 Workshop on Socio-Economic Issues in Next-Generation Internet
Year: 2008
Pagination: 25-26
Publisher: BTH/EuroFGI
City: Karlskrona
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Telecommunication Systems (Sektionen för teknik – avd. för telekommunikationssystem)
School of Engineering S- 372 25 Ronneby
+46 455 38 50 00
Authors e-mail:
Language: English
Abstract: In this paper, we propose how to parameterize and maintain a reputation system that, based on the current network conditions, supports the selection of the optimal end-to-end communication path for VoIP communication in a P2P context. Each node’s reputation is formed based on three factors: (1) performance reputation (own experience from passive measures of the network conditions); (2) security reputation; and (3) information reputation consisting of recommendations from other nodes. Reputation data is periodically updated from continuous monitoring of path quality and security and also from information exchange between the nodes. When network conditions deteriorate, the reputation system enables switching, if possible, to another available path for furthercommunication.
The proposed reputation system is a component of the SecMon system, which is intended especially for VoIP service over P2P networks. SecMon features lightweight QoS parameter monitoring, authentication and data integrity services. The exchange of monitoring information represents a low-bandwidth consumption solution that is transparent to the users and possesses a self-organizing capability. The above-mentioned exchange features are accomplished by utilizing two information hiding techniques: digital audio watermarking and network steganography. These techniques are used to create covert channels that serve as transport channels for lightweight QoS measurement results.
Moreover, in this paper, we present results of the simulations that were performed to investigate how the proposed reputation system is performing for a simple twopath case scenario. Additionally, we show how different network conditions like delays and packet losses affect the proposed reputation system and how they are modeled with utility functions. Results of the simulations also illustrate the approaches to thresholds that trigger path changes.
Summary in Swedish: Pappret utvecklar ett "ryktessystem" (reputation system) som kombinerar uppmätta kommunikationskvalitets- och säkerhetsparametrar som unterlag för vägvalet i ett Peer-to-Peer (P2P) nätverk.
Subject: Telecommunications\General
Telecommunications\Network Security
Computer Science\Networks and Communications
Keywords: QoE, QoS, security, measurements, summary statistics, utility function, routing, overlay network, P2P, VoIP