################
##			  ##
## Secure SSH ##
##			  ##
################

~$ cd ~

~$ mkdir .ssh && cd .ssh && ssh-keygen -o -a 100 -t ed25519

~$ cat id_ed25519.pub >> authorized_keys

~$ chmod 600 authorized_keys && cd .. && chmod 700 .ssh

--- save the private key (id_XXXXXXX) to your hard drive. then delete the private key (id_XXXXXXX) and the public key (id_XXXXXXX.pub) on your server ---

~$ sudo nano /etc/ssh/sshd_config
		|
Port 24
		|----------------------------------------------
# Authentication:
LoginGraceTime 120
PermitRootLogin no
StrictModes yes
#		|-----------------------------------------------
AuthorizedKeysFile	%h/.ssh/authorized_keys
PermitEmptyPasswords no
ChallengeResponseAuthentication no
PasswordAuthentication no
#		|-----------------------------------------------

## SAVE AND EXIT

~$ sudo /etc/init.d/ssh restart

--- start a new putty session to your server with the new port, log into your server with the private key - if this was successfull exit the old session by typing `exit` ---