At first, you have to download the Signature of the file and our key as well.

Next, import the key. In order to do this change to the directory where you saved the key using the command line. If you are using GnuPG enter now

gpg2 --import JonDos_GmbH.asc

Now, check the fingerprint of the imported key typing

gpg2 --fingerprint JonDos

The key with the uid JonDos GmbH must have the fingerprint 1866 F973 8C97 A3D6 56A4 E142 F510 0840 F130 5880.

If you have not done it yet, change to the directory containing the signature (JonDoSetup.paf.exe.asc) and the downloaded JonDo file. Then type

gpg2 --verify JonDoSetup.paf.exe.asc JonDoSetup.paf.exe

If you see a message like "Good signature from 'JonDos GmbH' ..." then the JonDo file was signed properly.

Hint: User of other operating systems and/or other crypto-tools must modify the commands above appropriately. The same holds for the testing of other files signed by us.