Can SSH replace SSL/TLS for websites?

No. SSH is for interactive sessions and file transfer, not for serving web traffic. Browsers connect to websites using SSL/TLS (HTTPS). You cannot serve a website over SSH.

Is SSH the same as a VPN?

No, but SSH tunneling can accomplish some of the same goals. An SSH tunnel forwards a specific port over an encrypted connection. A VPN routes all network traffic through an encrypted tunnel. For accessing a single service, SSH tunneling is simpler.

How do I generate an SSH key pair?

Run: ssh-keygen -t ed25519 -C "your@email.com". This creates ~/.ssh/id_ed25519 (private) and ~/.ssh/id_ed25519.pub (public). Add the public key to your server's ~/.ssh/authorized_keys. Never share the private key.

What is the difference between SSL and TLS?

TLS (Transport Layer Security) is the modern successor to SSL (Secure Sockets Layer). SSL 2.0 and 3.0 are deprecated and insecure. TLS 1.2 and 1.3 are current standards. The term "SSL certificate" persists colloquially but modern implementations use TLS.

Last updated: April 11, 2026

SSH vs SSL/TLS — What Is the Difference?

Quick Answer

SSH (Secure Shell) is for secure remote access and file transfer — it authenticates users via key pairs and encrypts terminal sessions. SSL/TLS is for securing data in transit over the web — it authenticates servers via certificates and encrypts HTTPS, SMTP, and other traffic. They solve different problems and are not interchangeable.

SSH vs SSL/TLS — Side by Side

Feature	SSH	SSL/TLS
Primary use	Remote shell access, SCP/SFTP file transfer	Encrypting web traffic (HTTPS), email, APIs
Authentication	Key pairs (public/private) or password	Server certificates (CA-signed)
Default port	22	443 (HTTPS), 465 (SMTPS)
Certificate authority	No CA — trust on first use (TOFU)	Requires CA (Let's Encrypt, DigiCert, etc.)
Key format	OpenSSH format (.pub / private key pair)	X.509 certificates (.pem, .crt, .p12)
Common tools	OpenSSH, PuTTY, ssh-keygen	OpenSSL, Let's Encrypt, certbot
Tunneling	Yes — SSH tunnels forward arbitrary ports	No built-in tunneling
Who uses it	Developers, sysadmins (server access)	Websites, APIs, any HTTPS endpoint
Operates at	Application layer	Transport layer

Verdict

Use SSH to connect to servers, deploy code, or transfer files securely. Use SSL/TLS to secure your website or API. They are complementary — your web server likely uses both: SSL/TLS for HTTPS to browsers, and SSH for admin access.

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