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With the help of a digital user certificate according to the X.509 standard, you can sign and encrypt files, among other things. The software Kleopatra is suitable for convenient signing/encryption and checking/decryption of files.
Under Microsoft Windows, Kleopatra is part of the so-called “Gpg4win” package, which you can download here. If you like you can donate to Gpg4win, but you can also start the download by selecting “0€”. Install Gpg4win on your PC, you can use all default values during the installation.
Under Linux, install the package “kleopatra” with the help of the integrated software management.
For proper functioning, you must integrate the certification authorities into Kleopatra. You can find them here and then add them to the software under the Kleopatra menu item “File / Import”. At the end, close all tabs named “Imported Certificates” and leave only the “All Certificates” tab open.
Currently, certificate revocation lists are not supported, so you need to disable the check:
In the further course, you must create a digital user certificate using your certificate created under User certificates (section Backup) to import the certificate file:
To do this, import the certificate file created under User certificates (section Backup). In the course of the import dialogue, you will be asked to enter a passphrase in the “pinentry” window; this is the password that you also entered when creating the user certificate under Backup (you may have to enter this password two more times).
If you want to encrypt files for other people, you must have the public part of the user certificate of the person you are receiving and also import it into Kleopatra.
Now you can sign and/or encrypt files in Kleopatra:
Now you can check files in Kleopatra for a valid signature and/or decrypt them: