Accessed Ĭhina Tells Carriers to Block Access to Personal VPNs by February. Accessed īlocking-resistant communication through domain fronting. We implemented and successfully tested DNS-Morph using one of the PTs (ScrambleSuit), and verified its capabilities.Īlexa: The top 500 sites on the web. Using DNS-Morph, the Tor client acts as a DNS client which sends DNS queries to the Tor bridge, and receives DNS responses from it. To illustrate our claim, we introduce DNS-Morph: a new method of transforming the handshake data of a PT by imitating a sequence of DNS queries and responses. We claim that this separation reduces the possibility of marking Tor related communications. Thus, allowing mixing different PTs, e.g., ScrambleSuit for the handshake and FTE for the traffic itself. In this paper we introduce a new approach aiming to enhance the PT’s resistance against active probing attacks, as well as white-listing censorship by partitioning the handshake of the PT from its encrypted communication. As a response to Tor-blocking attempts, the Tor community has developed Pluggable Transports (PTs), tools that transform the appearance of Tor’s traffic flow. These attacks include deep packet inspection (DPI) to classify Tor traffic as well as legitimate Tor client impersonation (active probing) to expose Tor bridges. Tor is a popular system for anonymous communication and censorship circumvention on the web, this puts Tor as a target for attacks by organizations and governmental bodies whose goal is to hinder users’ ability to connect to it.
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