Secure Shell (SSH)

What is Secure Shell (SSH)?

Secure Shell (SSH) is a network protocol used to securely connect to a remote computer. It allows users to remotely log in to another computer over a network and execute commands, transfer files, and perform other tasks as if they were physically present at the remote computer.

SSH uses encryption to secure the connection between the client and the server, making it more secure than other methods of remote access such as Telnet. It is commonly used to access servers and other devices over the internet, as well as to remotely control and manage network infrastructure.

To use SSH, a client program (such as "ssh" on Linux and macOS, or "PuTTY" on Windows) is used to connect to the remote machine. The client authenticates the server using a public key and then establishes an encrypted connection. Once the connection is established, the client can execute commands on the remote machine, or open a shell (a command-line interface) to interact with the remote machine.

In addition to providing secure remote access, SSH can also be used to tunnel other network protocols over an encrypted connection, allowing them to be securely transmitted over the internet. This is often used to securely connect to internal networks or to bypass network restrictions.

Overall, SSH is a powerful and widely used tool for securely accessing and managing remote systems. It is commonly used by system administrators and other IT professionals to remotely manage servers and other network infrastructure.