Crowds: anonymity for Web transactions
ACM Transactions on Information and System Security (TISSEC)
Communications of the ACM
Anonymous Web transactions with Crowds
Communications of the ACM
Untraceable electronic mail, return addresses, and digital pseudonyms
Communications of the ACM
Web MIXes: a system for anonymous and unobservable Internet access
International workshop on Designing privacy enhancing technologies: design issues in anonymity and unobservability
Tarzan: a peer-to-peer anonymizing network layer
Proceedings of the 9th ACM conference on Computer and communications security
Location diversity in anonymity networks
Proceedings of the 2004 ACM workshop on Privacy in the electronic society
Understanding the network-level behavior of spammers
Proceedings of the 2006 conference on Applications, technologies, architectures, and protocols for computer communications
Tor: the second-generation onion router
SSYM'04 Proceedings of the 13th conference on USENIX Security Symposium - Volume 13
Shining Light in Dark Places: Understanding the Tor Network
PETS '08 Proceedings of the 8th international symposium on Privacy Enhancing Technologies
On anonymity in an electronic society: A survey of anonymous communication systems
ACM Computing Surveys (CSUR)
A case study on measuring statistical data in the tor anonymity network
FC'10 Proceedings of the 14th international conference on Financial cryptograpy and data security
Digging into Anonymous Traffic: A Deep Analysis of the Tor Anonymizing Network
NSS '10 Proceedings of the 2010 Fourth International Conference on Network and System Security
Review: A survey on solutions and main free tools for privacy enhancing Web communications
Journal of Network and Computer Applications
Review: An overview of anonymity technology usage
Computer Communications
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Anonymity techniques provide legitimate usage such as privacy and freedom of speech, but are also used by cyber criminals to hide themselves. In this paper, we provide usage and geo-location analysis of major anonymization systems, i.e., anonymous proxy servers, remailers, JAP, I2P and Tor. Among these systems, remailers and JAP seem to have minimal usage. We then provide a detailed analysis of Tor system by analyzing traffic through two relays. Our results indicate certain countries utilize Tor network more than others. We also analyze anonymity systems from service perspective by inspecting sources of spam e-mail and peer-to-peer clients in recent data sets. We found that proxy servers are used more than other anonymity techniques in both. We believe this is due to proxies providing basic anonymity with minimal delay compared to other systems that incur higher delays.