![]() Identify, hence disrupt, the traffic belonging to these systems using today'sĪdvanced censorship technologies. ![]() Unfortunately, existing censorship circumvention systemsĭo not provide high availability guarantees to their users, as censors can Repressive regimes, leading them to develop and deploy censorship mechanisms Open communication over the Internet poses a serious threat to countries with We have implemented BridgeSPA as a working proof-of-concept, which is available under an open-source licence. Before this authorization takes place, the bridge will not reveal whether it is online. A client using BridgeSPA relies on innocuous single packet authorization (SPA) to present a time-limited key to a bridge. We present BridgeSPA as a method to mitigate this issue. If a bridge operator also browses with Tor on the same machine, this information may be sufficient to deanonymize him. An adversary that hoards this information may use it to determine when each bridge is online over time. Unfortunately, issues with Tor's bridge implementation make it easy to discover large numbers of bridges. ![]() To deal with such an adversary, Tor uses bridges, which are unlisted relays that can be used as alternative entry points into the Tor network. In response, some local adversaries restrict access to Tor by blocking each of the publicly listed relays. This indirection makes it difficult for a local adversary to determine with whom a particular Tor user is communicating. Tor clients form circuits through relays that are listed in a public directory, and then relay their encrypted traffic through these circuits. Tor is a network designed for low-latency anonymous communications.
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