Securing Your Server using Ed25519 SSH Keys

Standard password authentication via SSH leaves zero-trust architecture exceptionally vulnerable to brute-force dictionary attacks. Enforcing Ed25519 cryptographic keys prevents nearly all unauthenticated access attempts seamlessly.

Generate the Key Pair

Open your local terminal and instantly execute the secure key generation loop:

ssh-keygen -t ed25519 -C "admin@yourdomain.com"

Copying the Public Block

Copy the contents of your newly generated .pub file directly into the server’s ~/.ssh/authorized_keys directory.

Aggressive Lockdown

Navigate to /etc/ssh/sshd_config and fundamentally disable password-based routing by changing the string PasswordAuthentication yes directly to no. Follow up by actively restarting the SSH daemon pipeline.