2019-05-15 Michael BoelenDevelopment 24 comments

The 101 of ELF files on Linux: Understanding and Analysis

Some of the true craftsmanship in the world we take for granted. One of these things is the common tools on Linux, like ps and ls. Even though the commands might be perceived as simple, there is more to it when looking under the hood. This is where ELF or the Executable and Linkable Format comes in. A file format that used a lot, yet truly understood by only a few. Let’s get this understanding with this introduction tutorial! By reading […]

2018-07-10 (last updated at January 10th, 2019) Michael BoelenSSH 6 comments

OpenSSH security and hardening

SSH or Secure Shell is the popular protocol for doing system administration on Linux systems. It runs on most systems, often with its default configuration. As this service opens up a potential gateway into the system, it is one of the steps to hardening a Linux system. This article covers the SSH security tips to secure the OpenSSH service and increase the defenses of the system. OpenSSH security OpenSSH is under development by the security fanatics from the OpenBSD project. Every new […]

2018-06-23 (last updated at July 9th, 2018) Michael BoelenAuditing, Hardening, Linux 4 comments

How to secure a Linux system

Every Linux system will benefit from more security, especially if it contains sensitive data. With so many resources available on the internet, one might think that securing Linux has become easy. We know it is not. Linux system hardening takes a good amount of understanding about how the Linux kernel works. It also requires a good understanding of the operating system principles. In this guide, we will help you to get this understanding and provide you with tips and tools. The […]

2018-06-12 (last updated at July 22nd, 2018) Michael BoelenCareer

How to become a Linux security expert?

Years ago it was a challenge to find screenshots of devices running Linux. Nowadays, Linux can power phones, TV’s, computer systems, mainframes, and many more devices. With more devices, the demand for Linux knowledge will continue to grow. At the same time, the demand for security is higher than ever. All the media attention and regulations like GDPR, asks for more Linux security specialists. In this post, the goal is to answer the question: How to become a Linux security expert? […]