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Certificate-based SSH authentication is superior to SSH keys in many ways:
- SSH certificates intrinsically possess a validity period before and after which they are invalid for providing authentication.
- SSH certificates can be embedded with SSH restrictions that limit:
- Who can use the certificate
- The list of available SSH features (X11Forwarding, AgentForwarding, etc)
- Which SSH client machines can use the certificate
- Commands that can be run via SSH