Linux Administration: A Beginner’s Guide, Seventh Edition, 7th Edition

CHAPTER 22

Secure Shell (SSH)

In Chapter 15, we discussed techniques for securing your Linux system, all of which are designed to limit remote access to your system to the bare essentials. But what if you need to perform system administrative duties from a remote site? Traditional Telnet is woefully insecure, because it transmits the entire session (logins, passwords, and all) in cleartext. How can you reap the benefits of a truly multiuser system if you can’t securely log into it?

To tackle the issue of remote login versus password security, a solution called Secure Shell (SSH) was developed. SSH is a suite of network communication tools that are collectively based on an open protocol/standard that is guided by the Internet Engineering Task ...