My friend and I have been given the task to make a server that needs to be available on the internet to receive either: A string of text, Or a .txt File. However, I need this thing to be secure, fast acting, and very reliable. I was wondering if I should use the Pi as an FTP server or use some sort of HTTP server. Also be aware that it will need to be able to receive data from different users at once. One I get the text to the pi, I know what I need to do. But getting it there securely and reliably becomes the issue. Any help would be appreciated.