Book Image

Mastering Linux Security and Hardening

By : Donald A. Tevault
Book Image

Mastering Linux Security and Hardening

By: Donald A. Tevault

Overview of this book

This book has extensive coverage of techniques that will help prevent attackers from breaching your system, by building a much more secure Linux environment. You will learn various security techniques such as SSH hardening, network service detection, setting up firewalls, encrypting file systems, protecting user accounts, authentication processes, and so on. Moving forward, you will also develop hands-on skills with advanced Linux permissions, access control, special modes, and more. Lastly, this book will also cover best practices and troubleshooting techniques to get your work done efficiently. By the end of this book, you will be confident in delivering a system that will be much harder to compromise.
Table of Contents (15 chapters)
Title Page
Packt Upsell

GNU Privacy Guard

We'll begin with GNU Privacy Guard (GPG). This is a free open source implementation of Phil Zimmermann's Pretty Good Privacy, which he created back in 1991. You can use either one of them to either encrypt or cryptographically sign files or messages. In this section, we'll focus strictly on GPG.

There are some advantages of using GPG:

  • It uses strong, hard-to-crack encryption algorithms.
  • It uses the private/public key scheme, which eliminates the need to transfer a password to a message or file recipient in a secure manner. Instead, just send along your public key, which is useless to anyone other than the intended recipient.
  • You can use GPG to just encrypt your own files for your own use, the same as you'd use any other encryption utility.
  • It can be used to encrypt email messages, allowing you to have true end-to-end encryption for sensitive emails.
  • There are a few GUI-type frontends available to make it somewhat easier to use.

But, as you might know, there are also some disadvantages...