How to: Harden My Filesystem in Linux

Find the HOWTO or step-by-step guide that you need right here.

Understanding Ownership and Access Control for Enhanced Security

In today's interconnected world, controlling who has access to and can modify files is important. Understanding file permissions, whether you're a system administrator or developer, is essential to ensuring the security and management of your da...
May 18, 2024
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5 Linux File and Folder Management Commands You Need to Know

Linux offers over 1,000 commands for a simple service.&...
Mar 26, 2024
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How To Easily Change Folder and File Permissions on Linux

Linux file permissions enable you to allow or prevent o...
Dec 20, 2023
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Discover How To Harden My Filesystem HOWTOs

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Securing Linux Production Systems

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This article is a practical step-by-step guide for securing Linux production systems. It shows how to meet basic security requirements for Linux systems that need to pass security audits. This guide also discusses some Linux security steps that canno

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cryptlib Encryption Toolkit

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cryptlib is a powerful security toolkit that allows even inexperienced crypto programmers to easily add encryption and authentication services to their software.

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RSBAC - Rule Set Based Access Control

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RSBAC is a flexible, powerful and fast open source access control framework for current Linux kernels, which has been in stable production use since January 2000 (version 1.0.9a). All development is independent of governments and big companies, and

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Lud's Linux Corner

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You will find security tips to improve your overall system security by the use of IPChains, IPTables, and TCP Wrappers. And you will learn some useful and subtle configuration options for Sendmail, Postfix, Bind, NFS and others.

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linsec TWiki

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linsec TWiki is a web-based collaboration tool for a personal project detailing security on Linux in particular, but any *NIX-ish operating system (ie. OpenBSD, Mac OS X, etc.).

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Knocker

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Knocker is a simple and easy to use TCP security port scanner written in C to analyze hosts and all of the different services started on them.

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Kismet

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Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system. Kismet will work with any wireless card which supports raw monitoring (rfmon) mode, and can sniff 802.11b, 802.11a, and 802.11g traffic.

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John the Ripper password cracker

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John the Ripper is a fast password cracker, currently available for many flavors of Unix (11 are officially supported, not counting different architectures), DOS, Win32, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords.

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flawfinder

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This is the main web site for flawfinder, a program that examines source code and reports possible security weaknesses (``flaws'') sorted by risk level. It's very useful for quickly finding and removing at least some potential security problems befor

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ettercap

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Ettercap is a suite for man in the middle attacks on LAN. It features sniffing of live connections, content filtering on the fly and many other interesting tricks. It supports active and passive dissection of many protocols (even ciphered ones) and

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Beginner's guide to armoring Linux

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Organizations throughout the world are adopting Linux as their production platform. By connecting to the Internet to provide critical services, they also become targets of opportunity. To help protect these Linux systems, this article covers the basi

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