PGP: difference between Kleopatra and Kgpg, both from KDE

[Marco Möller]

Hello,
Could someone explain for a raw beginner concerning the usage of PGP the 
difference between Kleopatra and Kgpg, what the typical work case is for 
the one and the other, what important feature the one and the other is 
missing?


Sorry for the related but low specific questions in the following. Being 
a raw beginner in the topic of PGP signing of email messages, it is 
difficult to even know what exactly to ask for. My internet search 
engine of choice and the KDE web sites both unfortunately did not guide 
me to a nice reading about the differences of Kleopatra and Kgpg, and 
adding Thunderbird to this does not make the topic easier to grasp. 
Therefore please allow me to add the following complex of questions:
The background to my questions is, that I am aiming to soon use PGP 
signatures when working with Thunderbird, but I would not know if 
Kleopatra or if Kpgp would be better suited to support this. Besides, as 
a raw beginner in the topic of PGP, I am not even sure right now if I 
might find good usage of PGP for whatever else in the future (maybe 
authentication for a ssh access?), and if for this I should right away 
start to get comfortable with the one or the other tool, Kleopatra or 
Kpgp, or if anyway both will be needed because they target different 
work cases or complement each other?
At the moment my impression is that Thunderbird even comes with its own 
PGP implementation and is not using any other PGP parts of the rest of 
my Debian? Will Kleopatra or Kpgp then be of any help for me at all 
right now?
I find package "gnupg" (maybe for the package manager apt to work 
fine?), but no package which in its package name would explicitly 
contain the word openpgp. Is there a special openpgp package which I 
should install in order to get well prepared for a typical PGP future?

Thanks a lot! Marco.