OpenSSH
OpenSSH is the de facto standard for secure remote administration on Linux.
Why it matters
- Enables secure command-line administration over untrusted networks.
- Supports key-based authentication and access controls.
- Provides secure copy tools (
scp,sftp) for operations workflows.
Hardening essentials
- Disable password auth where possible.
- Restrict root login and use least-privilege users.
- Enforce modern ciphers and key algorithms.