How does ssh command work internally in Linux?

The SSH (Secure Shell) command is a protocol used to securely access and manage devices over a network. Internally, SSH operates using a client-server architecture. The SSH client initiates a connection to the SSH server, and the communication is encrypted to ensure data security. Here's a breakdown of how the SSH command works internally in Linux:

• Initiation: The SSH client starts by sending a connection request to the SSH server on the designated port (default is 22).
• Key Exchange: During this phase, the client and server exchange public keys to establish trust and derive a shared encryption key.
• Authentication: The client proves its identity to the server using various methods, such as password authentication or public key authentication.
• Session Establishment: Once authenticated, a secure channel is set up for communication, and the user can execute commands on the remote device.
• Data Transfer: All data transferred between the client and server is encrypted, ensuring confidentiality and integrity.

Here is a basic example of using the SSH command: