How does an SSH work?

 
SSH (Secure Shell) is a cryptographic network protocol that provides a secure, encrypted way to access and manage remote systems over an insecure network, such as the Internet.


When a user wants to connect to a remote system using SSH, the user runs an SSH client program on their local system and connects to an SSH server on the remote system. The client and server negotiate a secure, encrypted connection using a public-key cryptography system.


Once the secure connection is established, the user can securely log in to the remote system and run commands as if they were logged in locally. All data transmitted between the client and server, including login credentials and commands, is encrypted, preventing eavesdropping and tampering.


In addition to providing secure shell access, SSH also provides secure file transfer capabilities through the SFTP (Secure FTP) and SCP (Secure Copy) protocols. These protocols provide encrypted, secure ways to transfer files between systems over an insecure network.


Overall, SSH is a powerful tool for securely accessing and managing remote systems, and it is widely used by administrators, developers, and other professionals to access remote servers, configure network devices, and automate tasks.