Ubuntu 20.04 Essentials by Ubuntu 20.04 Essentials
Author:Ubuntu 20.04 Essentials
Language: eng
Format: epub
Published: 2020-06-09T14:21:41+00:00
18.1 An Overview of Secure Shell (SSH)
SSH is designed to allow secure remote access to systems for the purposes of gaining shell access and transferring files and data. As will be covered in “Ubuntu Remote Desktop Access with Vino”, SSH can also be used to provide a secure tunnel through which remote access to the GNOME desktop can be achieved over a network connection.
A basic SSH configuration consists of a client (used on the computer establishing the connection) and a server (running on the system to which the connection is to be established). A user might, for example, use an SSH client running on a Linux, Windows or macOS system to connect to the SSH server running on an Ubuntu system to gain access to a shell command-line prompt or to perform file transfers. All of the communications between client and server, including the password entered to gain access, are encrypted to prevent outside parties from intercepting the data.
The inherent weakness in a basic SSH implementation is that it depends entirely on the strength of the passwords assigned to the accounts on the system. If a malicious party is able to identify the password for an account (either through guess work, subterfuge or a brute force attack) the system becomes vulnerable. This weakness can be addressed by implementing SSH key-based authentication.
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