I’ll explain in this article how to properly setup a SFTP server with chrooted users being only able to access their own directory, and authenticated by public keys or a password. This is a very useful setup, which can get a bit tricky especially with the permissions. Unlike FTPS which is FTP over TLS, SFTP is a totally different protocol built on top of SSH. This especially means you don’t need any third-party software, since OpenSSH is installed by default on most linux distributions.