In This Chapter
Securing passwords on your Linux system
Protecting the system’s files and directories
Using GnuPG to encrypt and sign files
Monitoring the security of your system
Hardening Internet services
Using Secure Shell for secure remote logins
Setting up simple firewalls and enabling packet filtering
To secure your Linux system, you have to pay attention to both host security and network security. The distinction between the two types of security is somewhat arbitrary because securing the network involves securing the applications on the host that relate to what Internet services your system offers.
This chapter first examines host security and then explains how you can secure network services (mostly by not offering unnecessary services), how you can ...