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Glossary
The Tor Project
Note: This document aims to specify terms, notations or phrases related
to Tor and The Tor Project.
This glossary is not a design document; it is only a reference.
0. Preliminaries
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
RFC 2119.
0.1 Commonly used Tor configuration terms
ORPort - Onion Router Port
DirPort - Directory Port
0.2 Tor network components
Relay, aka OR (onion router) -
Exit relay
Non-exit relay
Guard relay
Client, aka OP (onion proxy)
Bridge -
Circuit: An established path through the network, where cryptographic keys
are negotiated using the ntor protocol with each hop. Circuits can differ
in length depending on their purpose. See also Leaky Pipe Topology.
Origin Circuit -
Exit Circuit: A circuit which connects clients to destinations
outside the Tor network. For example, if a client wanted to visit
duckduckgo.com, this connection would require an exit circuit.
Internal Circuit: A circuit whose traffic never leaves the Tor
network. For example, a client could connect to a hidden service via
an internal circuit.
Stream
Edge connection:
TLS connection:
Link handshake
Circuit handshake
Leaky Pipe Topology: The ability for packets to be addressed to any hop
in the path of a circuit. The destination hop is determined by using the
recognized field of relay cells.
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