Security

Defending Against Sybil Attacks in Anonymizing Networks

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Executive Summary

An anonymity network enables users to access the Web while blocking any tracking or tracing of their identity on the Internet. Tor is open-source anonymity software free to public use. This type of online anonymity moves Internet traffic through a worldwide network of volunteer servers. Anonymity networks prevent traffic analysis and network surveillance or at least make it more difficult. Website administrators routinely rely on IP-address blocking for disabling access to misbehaving users, but blocking IP addresses is not practical if the abuser routes through an anonymizing network. As a result, administrators block all known exit nodes of anonymizing networks, denying anonymous access to misbehaving and behaving users alike.

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