GNU PRIVACY GUARD
https://tinyurl.com/RenePaulMagesPublicGnuPGkey
http://nosoftwarepatents.wikidot.com/GnuPG
https://fr.wikipedia.org/wiki/GNU_Privacy_Guard
https://gnupg.com/
https://g10code.com/
https://werner.eifzilla.de/
https://www.gnupg.org/documentation/manuals/gnupg/Operational-GPG-Commands.html
https://renemages.wordpress.com/2015/05/01/cryptographie/