Glossary · Security and access
SSH
An encrypted protocol used for authenticated remote login and other secure network services.
Also called: Secure Shell, OpenSSH
Definition
Secure Shell establishes an encrypted connection between an SSH client and server, authenticates the server, and can authenticate the user with keys or other approved methods. It can carry remote commands, file transfer, and restricted forwarding.
Why it matters
SSH often reaches operational systems directly, so keys, allowed commands, host verification, logging, and revocation need deliberate controls.
Common misunderstanding
Encryption does not make every SSH account or command safe; excessive permissions, shared keys, and weak host verification still create risk.
Related terms
Related system family: Secure Integrations & Custom Tools
Sources
- RFC 4251: Secure Shell protocol architecture (opens in a new tab) · RFC Editor / IETF
Last reviewed July 16, 2026