An easier way to sign OpenPGP keys over the local network. A GTK/GNOME application to use GnuPG for signing other peoples' keys. Quickly, easily, and securely.
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GNOME Keysign

A tool for signing OpenPGP keys.

Its purpose is to ease signing other peoples' keys. It is similar to caff, PIUS, or monkeysign. In fact, it is influenced a lot by these tools and either reimplements ideas or reuses code. Consider either of the aboved mentioned tools when you need a much more mature codebase.

In contrast to caff or monkeysign, this tool enables you to sign a key without contacting a key server. It downloads an authenticated copy of the key from the other party. For now, the key is authenticated by its fingerprint which is securely transferred via a QR code. Alternatively, the user may type the fingerprint manually, assuming that it has been transferred securely via the audible channel.

After having obtained an authentic copy of the key, its UIDs are signed. The signatures are then encrypted and sent via email. In contrast to monkeysign, xdg-email is used to pop up a pre-filled email composer windows of the mail client the user has configured to use. This greatly reduces complexity as no SMTP configuration needs to be obtained and gives the user a well known interface.


The list of dependencies has not yet fully been determined. However, this list of Ubuntu packages seems to make it work:

python avahi-daemon python-avahi python-gi gir1.2-glib-2.0 gir1.2-gtk-3.0 python-dbus gir1.2-gstreamer-1.0 gir1.2-gst-plugins-base-1.0 gstreamer1.0-plugins-bad gstreamer1.0-plugins-good gstreamer1.0-x python-cairo

In Ubuntu, the package gstreamer1.0-x provides the xvimagesink element, gstreamer1.0-plugins-bad provides the zbar element, and gstreamer1.0-plugins-good provides the v4l2src element.

These packages should be optional:

python-requests monkeysign python-qrcode

Once you have the dependencies installed, a

pip install --user .

should do everything in order to install the program to your user's home directory.

If you don't have a local copy of the repository, you may try

pip install --user 'git+'


If you have installed the application with pip, a .desktop file should have been deployed such that you should be able to run the program from your desktop shell. Search for "Keysign". If you want to run the program from the command line, you can add ~/.local/bin to your PATH. The installation should have put an exectuable named keysign in that directory.

If you haven't installed via pip or not to your user's home directory (i.e. with --user), you can start the program from your environment's ./bin/ directory.


Server side

This describes running the application's server mode in order to allow you to have your key signed by others running the application in client mode.

Once you've fired up the application, you can see a list of your private keys. Select one and click "Next".

You will see the details of the key you've selected. You can revise your selected and click "Back". If you are happy with the key you have selected, click "Next". This will cause the key's availability to be published on the local network. Also, a HTTP server will be spawned in order to enable others to download your key. You also notice a bar code. For now, it encodes the fingerprint of the key you have selected.

Either share the fingerprint or the bar code with someone who wants to sign your key.

Client side

Here, the client side is described. This is to sign someone's key.

If you select the "Get Key" Tab, you can either enter a key's fingerprint manually or scan a bar code. If you meet someone who has the server side of the application running, you can scan the bar code present at the other party.

After you either typed a fingerprint or scanned a bar code, the program will look for the relevant key on your local network. Note that you've transmitted the fingerprint securely, i.e. via a visual channel in form of a bar code or the displayed fingerprint. This data allows to find the correct key. In fact, they client tries to find the correct key by comparing the fingerprint of the keys available on the local network.

After the correct key has been found, you see details of the key to be signed. If you are happy with what you see, i.e. because you have checked the names on the key to be correct, you can click next. This will cause the program to sign the key and open your mail program with the encrypted signature preloaded as attachment.