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Template:Apt-Transport-Tor

apt-transport-tor is a package that allows host operating systems or non-Whonix-Workstation VMs that are not behind a torifying gateway (like Whonix-Gateway) to torify their apt-get traffic for individual repositories.

With non-Whonix systems in mind, for security reasons apt-get blocks clearnet connections to .onion domains by default. apt-get developers want to protect users from accidentally trying to use .onion repositories without using Tor. Otherwise, a rouge DNS server could redirect users to a false domain and trick them into thinking they are using Tor when they are not.

Strictly speaking, there is no need to use apt-transport-tor inside Whonix VMs since all traffic is already routed over Tor. apt-get is stream isolated using a preconfigured uwt wrapper. In other words, apt-get in Whonix is already talking to a Tor SocksPort. Nevertheless, apt-transport-tor will be the default in Whonix 14 because it provides better error handling and stream isolation. [1] [2]
  1. For instance it reports if the .onion address is too long or short, and will use different circuits for different sources.
  2. apt-transport-tor will not result in Tor over Tor scenarios due to built-in Whonix settings preventing this.