SSH (Secure SHell) is a network protocol that allows you to securely execute commands on and transfer files to a remote server. Typically, most servers running SSH are configured to use password-based authentication; however,...
The Linux kernel comes with a packet filtering framework named netfilter. It allows you to allow, drop and modify traffic leaving in and out of a system. A tool, iptables builds upon this functionality...
A web application, being exposed to the web, is far more prone to be attacked than other kinds of applications. Building a secure web application is of prime importance — a hacked website costs...
SSH allows you to log in to a remote computer or server and control it through a command-line interface. However, because SSH is exposed to the internet; attackers can try to log in by...
Fail2ban is a versatile security tool. While it is primarily used for preventing brute-force attacks against SSH, it can also be used for protecting other services. There are bots which go around scanning the...