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The Secure Shell Protocol Explained Simply

This guide explains how the SSH protocol works, in plain words, and what you can do with it.

Files and FTP2 min read6 steps

What is a protocol?

A protocol is a set of rules that two computers follow so they understand each other. It is like agreeing to speak the same language before you chat.

What is SSH?

SSH means Secure Shell. It is a protocol for talking to a remote computer safely. Before SSH, people used tools like Telnet. Telnet sent everything as plain text, even passwords. SSH scrambles all of it. Scrambling data is called encryption.

How a connection works

  1. Your computer (the client) contacts the server, usually on port 22. A port is a numbered door on the server.
  2. The two sides agree on the SSH version and the scrambling methods they both support.
  3. The server proves who it is with a host key. This is like showing an ID card. It stops fake servers from tricking you.
  4. Both sides create a shared secret key. They use it to scramble everything that follows.
  5. You prove who you are with a password or an SSH key.
  6. You get a secure session. You can type commands and see the results.

Two ways to log in

  • Password: simple, but it can be guessed.
  • SSH key pair: a private file stays with you. A public file goes on the server. It is much harder to break.

What SSH is used for

  • Running commands on a server.
  • Moving files safely with SFTP and SCP.
  • Making secure tunnels, which carry other traffic through the SSH connection.
  • Letting tools like Git talk to remote code stores.

Try it

ssh username@your-server-address

This opens a secure session with your server. Your welcome email lists your address and username. Ask Hostvento support if SSH is available on your plan.

Good habits

  • Use SSH keys when you can.
  • Do not allow root to log in with a password.
  • Keep your server software updated.
  • Check the host fingerprint if a warning appears. Never ignore a changed-key warning without checking.
Tip: Most servers use SSH version 2. Version 1 is old and unsafe.

Quick recap

  • SSH is a set of rules for safe remote control of a computer.
  • It scrambles everything you send.
  • The server shows a host key so you know it is real.
  • Keys are safer than passwords.
  • SSH also powers SFTP, SCP and tunnels.