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Secure Shell (SSH)

Secure Shell (SSH) is a cryptographic network protocol that provides a secure channel over an unsecured network. It is the industry standard for logging into remote servers to execute commands and manage infrastructure.

SSH uses public-key cryptography to authenticate the remote computer and allow it to authenticate the user. For developers, SSH is the gateway to Server-Side Management. It allows for secure terminal access, enabling tasks such as manually updating server configurations, managing databases via CLI, and deploying code. Beyond simple password authentication, professional environments utilize SSH Keys (RSA or Ed25519) to provide a significantly higher level of security against brute-force attacks.

Frequently Asked Questions

Passwords can be guessed or “brute-forced.” SSH Keys consist of a public key (on the server) and a private key (on your machine). The private key never leaves your computer, and the authentication is based on a mathematical proof that is practically impossible to crack without the physical key file.

Port 22 is the standard default port for SSH traffic. Because it is so well-known, it is often targeted by automated bots. Professional server hardening often involves moving SSH to a Custom Port to reduce “background noise” and automated login attempts.

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