Secure Shell (SSH)

During my learning, I understood that Secure Shell (SSH) is a widely used protocol that enables secure remote access to servers. It is primarily utilized for logging into Linux and Unix servers, as well as certain networking devices like routers. With the growing importance of cybersecurity, SSH ensures encrypted communication, protecting sensitive data from potential threats.

When comparing SSH to alternatives, its security advantages become evident. Telnet, an older protocol, transmits data in plaintext, exposing passwords to network eavesdroppers. Virtual private networks (VPNs) provide encryption but grant full network access, unlike SSH, which follows the principle of least privilege. Remote desktop tools like VNC focus on graphical environments, making them less suited for Linux servers that often lack a GUI.

SSH operates with two main components: the SSH client and the SSH server. The server manages secure connections and authentication, while the client initiates requests like logging in or transferring files. SSH keys serve as cryptographic credentials, offering a more secure alternative to passwords. To prevent unauthorized access, never share your private SSH key or embed it in application code.