As you have likely learned by now, security on Linux is a huge topic. There is really so much more you can learn and so much more we could have included in this book.
Consider this final chapter a collection of different security features that we, the authors, wanted to cover but that just did not fit logically anywhere else in the book. In this chapter, you learn how to use the fail2ban service to temporarily block access to a system. You also learn how to set up a basic VPN (virtual private network) and secure files using the gpg utility. Lastly, you learn about security sites that provide useful alerts.
After reading this chapter and completing the exercises, you will be able to do the following: