ssh-key

Set Key="C:\Path\to\keyfile"

Cmd /c Icacls %Key% /c /t /Inheritance:d

Cmd /c Icacls %Key% /c /t /Grant %UserName%:F

Cmd /c Icacls %Key% /c /t /Remove Administrator "Authenticated Users" BUILTIN\Administrators BUILTIN Everyone System Users

Cmd /c Icacls %Key%

Nginx

sudo apt update

sudo apt install nginx

sudo ufw enable

sudo ufw app list

sudo ufw allow 'Nginx HTTP'

sudo ufw status

systemctl status nginx

Key SSH

gen private key for SSH

puttygen -t rsa -b 2048 -o private.ppk

convert ppk to pem

puttygen private.ppk -O private-openssh -o private.pem

gen public key from private key

openssl rsa -in private.pem -pubout

gen public key for authorized_key

ssh-keygen -y -f private.pem

format old private key

openssl rsa -text -in private.key