74Aca‖Digital Signature Menu
CDXV5‖Opens a menu for digital signature commands.
ebLJB‖From the menu bar:
B7UTd‖Choose .
Ub7GZ‖Adds and removes digital signatures to and from your document. You can also use the dialog to view certificates.
RM32g‖LibreOfficeDev can digitally sign an existing PDF document.