Veja traço, senha e chaves.
O programa é chamado cavalo-marinho e já está instalado e ativo em seu sistema.
Seahorse - Encryption Made Easy
Seahorse is a GNOME application for managing encryption keys.
It also integrates with nautilus, gedit and other places for encryption operations.
With seahorse you can...
Create and manage PGP keys
Create and manage SSH keys
Publish and retrieve keys from key servers
Cache your passphrase so you don't have to keep typing it
Backup your keys and keyring
more...
Pressione a tecla super para ir para o traço e comece a digitar password
e esse será o primeiro resultado.