Secure Shell (SSH)

Secure Shell (SSH) is a protocol for authenticated, encrypted access to remote systems and services.

Format
Security & Encryption
Updated
Updated
Glossary Security & Encryption
Secure Shell Also known as SSH.Aliases: SSH access, remote shell.

Definition

Secure Shell (SSH) is a protocol for authenticated, encrypted access to remote systems and services.

How it works

SSH is how administrators reach their servers: an encrypted, authenticated channel for running commands, transferring files, and tunneling other services. Key-based logins beat passwords, and it is worth restricting where connections can come from — an internet-facing SSH port collects login attempts around the clock.

Example: A VPS administrator connects over SSH to apply system updates.

Often confused: SSH secures remote administration of a machine; it is not HTTPS, and it is not a general-purpose VPN.

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Last reviewed 2026-07-19.