I found this strange server that only has two commands. Looks like there's a command to get the flag, but I can't figure out how to get it to work. It did come with a strange note that had 9W5iVNkvnM6igjQaWlcN0JJgH+7pComiQZYdkhycKjs= written on it. Maybe that's important? nc challenges.2020.squarectf.com 9020 hmac.go