Untraceable electronic mail, return addresses, and digital pseudonyms
Communications of the ACM
Improving TCP performance over mobile networks
ACM Computing Surveys (CSUR)
Tor: the second-generation onion router
SSYM'04 Proceedings of the 13th conference on USENIX Security Symposium - Volume 13
Denial of service or denial of security?
Proceedings of the 14th ACM conference on Computer and communications security
Shining Light in Dark Places: Understanding the Tor Network
PETS '08 Proceedings of the 8th international symposium on Privacy Enhancing Technologies
PET'02 Proceedings of the 2nd international conference on Privacy enhancing technologies
Achieving mobility and anonymity in IP-based networks
CANS'07 Proceedings of the 6th international conference on Cryptology and network security
An improved algorithm for tor circuit scheduling
Proceedings of the 17th ACM conference on Computer and communications security
Improving Security and Performance in the Tor Network through Tunable Path Selection
IEEE Transactions on Dependable and Secure Computing
DefenestraTor: throwing out windows in Tor
PETS'11 Proceedings of the 11th international conference on Privacy enhancing technologies
New directions in cryptography
IEEE Transactions on Information Theory
Anonymous connections and onion routing
IEEE Journal on Selected Areas in Communications
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The number of mobile devices, connecting to the Internet, is predicted to surpass desktop connections by 2014. The likely growth in their mobile client base will offer an additional challenge for anonymity networks, such as Tor, in maintaining an efficient privacy service. We have conducted a simple experiment that illustrates this challenge. We have simulated the performance achieved by a mobile Tor node as it roams at varying speeds between wireless networks. The results show that the impact on performance for the mobile user, and potentially the wider Tor network, is significant when roaming, and as expected, increases with higher mobility speeds and longer recovery times. We review a range of solutions and suggest that, although the use of a lighter transport protocol and/or adaptive client throttling may reduce the performance impact of mobility, a better strategy is to provide a persistent connection to the Tor network for roaming mobile users.