Nitrokey

This article describes how you can use your Nitrokey (Wikipedia) with NixOS

Installation

You must add the nitrokey udev rules and enable the gpg agent

services.udev.packages = [ pkgs.nitrokey-udev-rules ];
programs = {
  ssh.startAgent = false;
  gnupg.agent = {
    enable = true;
    enableSSHSupport = true;
  };
};