NAME

       obfsproxy - a pluggable transports proxy

SYNOPSIS

       obfsproxy [--log-file log_file] [--log-min-severity severity] [--no-log]
       [--no-safe-logging] managed obfsproxy [--log-file log_file] [--log-min-severity severity]
       [--no-log] [--no-safe-logging] transport [-h] [--dest dest] [--ext-cookie-file
       ext_cookie_file] ... mode listen_addr obfsproxy --help

DESCRIPTION

       obfsproxy is a tool that attempts to circumvent censorship, by transforming the Tor
       traffic between the client and the bridge. This way, censors, who usually monitor traffic
       between the client and the bridge, will see innocent-looking transformed traffic instead
       of the actual Tor traffic.

OPTIONS

       --log-file log_file
           Set logfile location.

       --log-min-severity severity
           Set minimum logging severity (default: no logging).  severity must be one of error,
           warning, info, debug.

       --no-log
           Disable logging.

       --no-safe-logging
           Disable safe (scrubbed address) logging.

       -h, --help
           Show help message and exit.

MANAGED TRANSPORT

       Using managed as TRANSPORT allows Tor to start and control obfsproxy by itself. Add a line
       like the following to torrc to use it when acting as a bridge:

           ServerTransportPlugin obfs3,scramblesuit exec /usr/bin/obfsproxy managed

       When connecting to an obfuscated bridge, adapt the following:

           ClientTransportPlugin obfs3,scramblesuit exec /usr/bin/obfsproxy managed

DUMMY TRANSPORT

       Use a protocol that simply proxies data without obfuscating them. For tests only.

       No extra options.

B64 TRANSPORT

       Use a protocol that encodes data with base64 before pushing them to the network.

       No extra options.

OBFS2 TRANSPORT

       Use the obfs2 protocol. obfs2 is known to be fingerprintable and is deprecated. See
       https://gitweb.torproject.org/obfsproxy.git/blob/HEAD:/doc/obfs2/protocol-spec.txt for the
       specification.

       No extra options.

OBFS3 TRANSPORT

       Use the obfs3 protocol. See
       https://gitweb.torproject.org/pluggable-transports/obfsproxy.git/blob/HEAD:/doc/obfs3/obfs3-protocol-spec.txt
       for the specification.

       No extra options.

SCRAMBLESUIT TRANSPORT

       Use the scramblesuit protocol. See
       https://gitweb.torproject.org/pluggable-transports/obfsproxy.git/blob/HEAD:/doc/scramblesuit/scramblesuit-spec.txt
       for the specification.

       --password password
           Shared secret for UniformDH. In server mode, a secret will be automatically generated
           if unspecified.

       In order to configure a password with Tor on the server side, the following can be added
       to torrc:

           ServerTransportOptions scramblesuit password=WFVTIHBLAHNBXWSUD6WYTEST42LPIPRT

       Tor clients (using a version later than 0.2.5.1-alpha) can then use:

           Bridge scramblesuit 192.0.2.42:2032 password=WFVTIHBLAHNBXWSUD6WYTEST42LPIPRT

COMMON TRANSPORT OPTIONS

       Here’s the common synopsis:

       Options common for all transports:

       transport
           One of managed, dummy, b64, obfs2, obfs3 or scramblesuit. See above for details.

       -h
           Show help message and exit.

       --dest dest
           Set destination address. Mandatory in all modes except socks.

       --ext-cookie-file ext_cookie_file
           Configure the filesystem path where the Extended ORPort authentication cookie is
           stored.

       mode
           Mode must be one of server (old-style ServerTransportPlugin), ext_server (support for
           Extended ORPort), client (bridge client) or socks (client using SOCKS to connect to
           bridges).

       listen_addr
           Address on which the proxy will listen.

BUGS

       Plenty, probably. obfsproxy is still in development. Please report them.

AUTHORS

       George Kadianakis <asn@torproject.org>

       Philipp Winter <phw@torproject.org>

       Brandon Wiley <brandon@blanu.net>

                                            10/24/2015                               OBFSPROXY(1)