How to Generate an SSH Key on Linux: A Step-by-Step Guide

Preparing Your Linux System for SSH Key Generation

• 💡 Open the terminal to begin the process of generating an SSH key.
• ⚠️ Verify SSH service status by typing sudo systemctl status ssh. Ensure it is active; if not, start it with sudo systemctl start ssh.
• 🔍 Check for existing SSH keys by navigating to the ~/.ssh directory. This hidden folder in your home directory is where SSH keys are typically stored.

Generating Your SSH Key Pair

• 🔑 Initiate key generation using the command ssh-keygen. Specify the key type with -t rsa.
• 📏 Set the key length to at least 4096 bits using -b 4096 for enhanced security.
• 📝 An optional comment can be added using -C for identification, such as test key.
• 💾 Choose the save location for your key pair, typically the default ~/.ssh directory.
• 🔒 Add an optional passphrase for an extra layer of security. If you prefer no passphrase, simply press Enter twice.

Understanding Your SSH Keys

• ✅ Upon successful generation, you will see confirmation of your public and private RSA key pair being saved.
• 📂 The ~/.ssh directory will now contain two files: the public key (e.g., id_rsa.pub) and the private key (e.g., id_rsa).
• ⚠️ Crucially, keep your private key secret and never share it. The public key can be shared freely.