Peer-to-Peer VoIP Communications Using Anonymisation Overlay Networks

Abstract. Nowadays, Voice over Internet Protocol (VoIP) which enables voice conversation remotely over packet switched networks gains much attentions for its low costs and flexible services. However, VoIP calling anonymity, particularly to withhold "who called whom", is difficult to achieve since VoIP infrastructures are usually deployed in an open networking environment (e.g., the Internet). Our work studies an anonymisation overlay network (AON) based solution to prevent surveillance from external attackers, who are able to wiretap the communication channels as well as to manipulate voice packets in the channels. However, it has been demonstrated that the VoIP combined with traditional AONs are vulnerable to two attacks, namely watermark attack and complementary matching attack. Taking these two attacks into account, we investigate the "defensive dropping" method in VoIP: A VoIP user-agent sends packets to an AON in a constant rate, but packets during periods of s...

• Type: Conference
• Year: 2010
• Where: CMS
• Authors: Ge Zhang, Simone Fischer-Hübner
• Keywords: Anonymisation Overlay Network, CMS 2010, Communications, Open Networking Environment, VoIP