Tor is free software that enables anonymous communication. It conceals a user's location and usage through a network of over 7,000 relays. Tor implements onion routing, which encrypts data including destination IP addresses and passes encrypted data through multiple relays, each decrypting a single layer to reveal only the next relay. This allows anonymously browsing the internet, protecting privacy and security such as from government surveillance disclosed by Edward Snowden.

1. Tor Network
Sujin Shrestha
Software Engineer

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Tor ?

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Introduction
• Free software for enabling anonymous
communication
• Also known as Onion Routing Protocol
• Conceal user location and usage by using more
than seven thousand relays

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Onion Routing
• Implemented by encryption in the application layer of a
communication protocol stack
• Encrypts the data, including the next node destination IP address.
• Each relay decrypts a layer of encryption to reveal only the next relay
in the circuit in order to pass the remaining encrypted data on to it.

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Network Communication

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Tor Network Communication

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Why Tor ?
• Anonymously browse the
Internet
• Privacy
• Security
• Save yourself from government

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Edward Snowden

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Which web are you on ?

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Application
Tor
Browser

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