Hi wouldn't it be nice to sign PDF without any external service?
Give JSignPDF a try JSignPdf - Just sign them! | JSignPdf (intoolswetrust.github.io)
JSignPdf download | SourceForge.net
GitHub - intoolswetrust/jsignpdf: PDF signing software written in Java. It supports visible signatures, timestamping, certificate verification and many other cool features
or...
In Ubuntu install apt-get install xournal add annotate picture as sign and sign all document by yours pgp key.
Sign:
gpg --clearsign --output=sign_file.pdf file.pdf
Verify:
$ gpg --verify sign_file.pdf
gpg: Signature made czw, 3 lut 2022, 12:45:58 CET
gpg: using RSA key 14644CCD80A59C3A15E226568C199B37E09FA079
gpg: Good signature from "xxxxx" [ultimate]
gpg: aka "xxxxxx" [ultimate]
If you used to GUI's and prefer the easy way of x509 ceertificate handeling give XCA a try
or for latest stuff GitHub - chris2511/xca: X Certificate and Key management
using openssl can be sometimes anoying if you are not working daily with the commandline syntax of it 
terminal multiplexer
Whenever you connect to a machine I highly recommend the usage of a terminal multiplexer.
the most common are tmux, screen.
screen uses ctrl+a for command
tmux uses ctrl+b for command
tmux vs. screen commands
from TIL/tmux/tmux_vs_screen-commands-v2.md at master · P7h/TIL · GitHub
| Action |
tmux |
screen |
| start a new session |
tmux
tmux new
tmux new-session |
screen |
| start a new session with a name |
tmux new -s name |
screen -S name |
| re-attach a detached session |
tmux attach
tmux attach-session |
screen -r |
| re-attach a detached session with a name |
tmux attach -t name
tmux a -t name |
screen -r name |
| re-attach an attached session (detaching it from elsewhere) |
tmux attach -d
tmux attach-session -d |
screen -dr |
| re-attach an attached session (keeping it attached elsewhere) |
tmux attach
tmux attach-session |
screen -x |
| detach from currently attached session |
^b d
^b :detach |
^a d |
| rename-window to newname |
^b ,
^b :rename-window |
^a A newname |
| list windows |
^b w |
^a w |
| list windows in chooseable menu |
|
^a " |
| go to window # |
^b # |
^a # |
| go to last-active window |
^b l |
^a l |
| go to next window |
^b n |
^a n |
| go to previous window |
^b p |
^a p |
| see keybindings |
^b ? |
^a ? |
| list sessions |
^b s
tmux ls
tmux list-sessions |
screen -ls |
| toggle visual bell |
|
^a ^g |
| kill the current pane |
^b x
logout
^D |
^a X |
| destroy the current window |
^b & |
^a k
^a ^k |
| exit current shell |
^d |
^d |
| create another window |
^b c |
^a c |
| switch to another pane |
^b o |
^a Tab |
| split pane horizontally |
^b " |
^a S
then ^a Tab
and ^a c |
| split pane vertically |
^b % |
^a |
then ^a Tab
and ^a c |
| close other panes except the current one |
^b ! |
|
| swap location of panes |
^b ^o |
|
| re-arrange current panes within same window (different layouts) |
^a space |
|
| show time |
^b t |
|
| show numeric values of panes |
^b q |
|
| enable scroll / view scrollback |
^b [
(and to exit q) |
^a [
(and to exit q) |
| copy text in one view |
|
^a [ ^m
(highlight text and enter)
(to save: ^a >) |
| paste text into a view |
|
^a ] |
