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You can add an SSH certificate authority (CA) to your organization and allow members to access the organization's repositories over Git using keys signed by the SSH CA.
Support for SSH certificate authorities is available with GitHub Enterprise Cloud and GitHub Enterprise Server 2.19+. For more information, see "GitHub's products."
With an SSH certificate authority, your organization or enterprise account can provide SSH certificates that members can use to access your resources with Git.
You can add or delete SSH certificate authorities from your organization.