期刊名称：International Journal of Computer Trends and Technology
电子版ISSN：2231-2803
出版年度：2013
卷号：4
期号：6-2
出版社：Seventh Sense Research Group
摘要：Tor (originally short for The Onion Router) is a system intended to enable online anonymity. The modern day anonymity networks hide user identities with the help of relayed anonymity routers. However, the lack of effective trust model disables users to monitor malicious or vulnerable routers, thus making them susceptible to such router based attacks. The Tor network uses selfreported bandwidth values from all routers for building optimal tunnels “performance vs anonymity”. Since tunnels are allocated in proportion to this bandwidth, this allows a malicious router operator to attract tunnels for compromise. This gauge being insensitive to load, does not adequately respond to changing conditions and results in unreliable performance, eventually driving users away. The new proposed opportunistic bandwidth measurement algorithm is built on reliable relay information for building paths for better performance, to lower the risk of lowresource attacks. Users will be able to explore the tradeoffs between performance and anonymity based on their needs. The traffic from different preferences also can be easily combined, making partitioning attacks difficult. The results of this opportunistic measurement and tunable performance extensions have been examined for performance both analytically and in the real Tor network.
