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Set "networking.tcpcrypt.enable = true;" to enable opportunistic TCP encryption based on the user-space tools available from <http://tcpcrypt.org>. Network attackers come in two varieties: passive and active (man-in-the-middle). Passive attacks are much simpler to execute because they just require listening on the network. Active attacks are much harder as they require listening and modifying network traffic, often requiring very precise timing that can make some attacks impractical. Opportunistic encryption cannot protect against active attackers, but it *does* protect against passive attackers. Furthermore, Tcpcrypt is powerful enough to stop active attacks, too, if the application using it performs authentication. A complete description of the protocol extension can be found at <http://tools.ietf.org/html/draft-bittau-tcp-crypt-00>. |
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*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.