TOR: Onion Routing

TOR Onion Routing (Syverson) is an anonymous communication technology used to anonymize network traffic. Messages are recursively encrypted and sent to routers on multiple network nodes or routes, where each router decrypts the message layer and passes it to the next router. This prevents the transport media from finding out who you are; the network knows that onion communication is taking place. Figure 1: "Onion" example, http: //en.wikipedia.org/wiki/File: Onion_diagram.svg Onion is formed by a plaintext message containing a continuous encryption layer so that each layer is as follows It is a data structure. The layer of onion is unfolded or decoded.

The basic principle of Tor is "onion routing". This is a technology for anonymous communication on the public network. On onion routing, the message is encapsulated in several encryption layers, as well as encapsulation of the OSI 7 layer model. There is a layer on onion, this network protocol also has layers, so it is called onion routing. The resulting "onions" (fully encapsulated messages) are sent through a series of nodes in the network (called onion router), each removing the "onion" layer and removing the next Reveal the destination. Decrypting the last layer gets the plain text of the original message.

The Tor browser routes all network traffic through the Tor network and anonymizes it. As shown in the figure below, Tor consists of three layers of agents, such as an onion layer (ie Tor onion logo). The Tor browser randomly connects to the publicly listed ingress node, bounces traffic through a randomly chosen intermediate relay, and finally expels your traffic through the third and last egress node. You can also configure the Tor browser to use the bridge if you live in a system that blocks Tor or you need access to a web service that blocks Tor. Unlike the ingress and egress nodes of Tor, the bridge IP address is not disclosed, so it is difficult for web services and government agencies to blacklist these IP addresses.