encryption with gpg

Generate key
$ gpg --gen-key
List keys
$ gpg --list-keys
Encrypt Data
With a passprhare
$ gpg -ca -o output.txt.gpg input.txt
with a certificate and from STDOUT
$ gpg -ea
or if you know the name already (can be key, name or email)
$ gpg -ea -r "Ahmy"
Decrypt Data
$ gpg -d file.txt.gpg
Export
Public key
$ gpg --export -a "name" > public.key
-a is to create armored ascii output.
Private Key
$ gpg --export-secret-key -a "name" > private.key
Import
Public key
$ gpg --export-secret-key -a "name" > private.key
Private Key
$ gpg --allow-secret-key-import --import private.key
Deleting
Public Key
$ gpg --delete-key "Real Name"
Private Key
$ gpg --delete-secret-key "Real Name"
Extend the expiration
gpg --edit-key "name"
Select the key to extend 

gpg> key 1
gpg> expire
Send key to a key server
gpg --keyserver keyserver.ubuntu.com --send-key "name"

diff output of 2 command

extend letsencrypt certificate with dns challenge

Last modified 11mo ago