# Permalinks These URLs at `spec.toprorject.org` are intended to be long-term permalinks.
/address-spec
https://spec.torproject.org/address-spec
(Special Hostnames in Tor)
/bandwidth-file-spec
https://spec.torproject.org/bandwidth-file-spec
(Directory Authority Bandwidth File spec)
/bridgedb-spec
https://spec.torproject.org/bridgedb-spec
(BridgeDB specification)
/cert-spec
https://spec.torproject.org/cert-spec
(Ed25519 certificates in Tor)
/collector-protocol
https://gitlab.torproject.org/tpo/network-health/metrics/collector/-/blob/master/src/main/resources/docs/PROTOCOL?ref_type=heads
(Protocol of CollecTor's File Structure)
/control-spec
https://spec.torproject.org/control-spec
(Tor control protocol, version 1)
/dir-spec
https://spec.torproject.org/dir-spec
(Tor directory protocol, version 3)
/dir-list-spec
https://spec.torproject.org/dir-list-spec
(Tor Directory List file format)
/ext-orport-spec
https://spec.torproject.org/ext-orport-spec
(Extended ORPort for pluggable transports)
/gettor-spec
https://gitlab.torproject.org/tpo/core/torspec/-/raw/main/attic/text_formats/gettor-spec.txt?ref_type=heads
(GetTor specification)
/padding-spec
https://spec.torproject.org/padding-spec
(Tor Padding Specification)
/path-spec
https://spec.torproject.org/path-spec
(Tor Path Specification)
/pt-spec
https://spec.torproject.org/pt-spec
(Tor Pluggable Transport Specification, version 1)
/rend-spec
https://spec.torproject.org/rend-spec
(Tor Onion Service Rendezvous Specification, latest version)
/rend-spec-v2
https://gitlab.torproject.org/tpo/core/torspec/-/blob/main/attic/rend-spec-v2.txt?ref_type=heads
(Tor Onion Service Rendezvous Specification, Version 2 (Obsolete))
/rend-spec-v3
https://spec.torproject.org/rend-spec
(Tor Onion Service Rendezvous Specification, Version 3 (Latest))
/socks-extensions
https://spec.torproject.org/socks-extensions
(Tor's extensions to the SOCKS protocol)
/srv-spec
https://spec.torproject.org/srv-spec
(Tor Shared Random Subsystem Specification)
/tor-fw-helper-spec
https://gitlab.torproject.org/tpo/core/torspec/-/blob/main/attic/tor-fw-helper-spec.txt?ref_type=heads
(Tor's (little) Firewall Helper specification)
/tor-spec
https://spec.torproject.org/tor-spec
(Tor Protocol Specification)
/torbrowser-design
https://2019.www.torproject.org/projects/torbrowser/design/
(The Design and Implementation of the Tor Browser)
/version-spec
https://spec.torproject.org/version-spec
(How Tor Version Numbers Work)
/tor-design
https://svn.torproject.org/svn/projects/design-paper/tor-design.pdf
(Tor: The Second-Generation Onion Router)
/walking-onions
https://spec.torproject.org/proposals/323-walking-onions-full.html
(Walking Onions specifications)