Terminology » Security » SSL vs SSH: Key Differences Explained

SSL vs SSH: Key Differences Explained

ssl ssh security protocol encryption

SSL and SSH are cryptographic protocols. They are designed to secure data transmission over networks. They serve distinct purposes. Let us compare SSL vs SSH and highlights the key differences between them.

SSL

Secure Sockets Layer(SSL) is a security protocol. It establishes encrypted links between a web server and a browser. It ensures that all data transmitted remains private and integral.

  • It was originally developed by Netscape.
  • SSL certificates authenticate the identity of a website and enable secure connections, which are indicated by “https://” in the browser’s address bar.
  • SSL has been succeeded by Transport Layer Security (TLS).
  • It helps to secure login details (username, password), banking details (credit or debit card numbers, personal data) etc.

SSH

Secure Shell(SSH) is a cryptographic network protocol designed for secure remote login and other secure network services over an unsecured network.

  • SSH replaces older, insecure protocols like Telnet and FTP.
  • It operates as client server model.
  • It typically uses port 22.
  • Offers secure command line access, file transfers and tunneling.
  • Used by network admins to manage servers and network infrastructures.

SSL vs SSH: A Comparison Table

SpecificationsSSL (Secure Socket Layer)SSH (Secure Shell)
Full formSecure Socket LayerSecure Shell
Port number44322
FunctionUsed to encrypt communication between a browser and a serverUsed to encrypt communication between two computers
AuthenticationUsing public key & private key pairUsing public key & private key pair OR User ID & Password Pair
ApplicationsWidely used by e-commerce, banking, healthcare, social media, government, etc.Commonly used and adopted in the networking domain
WorkingOperates based on certificatesOperates based on network tunnels

Messages for SSL and SSH

SSL vs SSH Protocol

The figure depicts messages exchanged between client and server for SSL protocol and SSH protocol.

Summary

  • SSL (Secure Sockets Layer) is primarily used to encrypt data between web browsers and servers, ensuring secure web communications such as online transactions and form submissions.
  • In contrast, SSH (Secure Shell) is utilized for secure remote access to servers, allowing administrators to execute commands and manage systems over unsecured networks.
  • While both protocols employ encryption and authentication mechanisms, their applications differ i.e. SSL/TLS secures data in transit for web based interactions, whereas SSH provides a secure channel for remote system administration.