For what purpose does macOS use the bootstrap token?

The bootstrap token in macOS serves the purpose of granting a secure token during login. When a user logs into a Mac that has been set up with FileVault, the system issues a secure token to the user's account if they have administrative privileges. This secure token is essential for operations like enabling and managing FileVault, as it allows the user account to authorize access to the encrypted disk.

The significance of the bootstrap token lies in its ability to allow seamless access while maintaining security protocols. It also works in conjunction with the secure token system, which enhances the authentication framework within macOS, ensuring that only authorized users can access sensitive data and system functions. This mechanism is particularly important when handling encrypted volumes and enabling security features, providing a robust method for ensuring data protection while allowing the necessary access to users with legitimate rights.

The other options, while related to macOS functions, do not accurately describe the specific role of the bootstrap token in the login process. For instance, while resetting the administrator password and unlocking FileVault are tasks that could be performed with appropriate authorization, they do not center on the primary role of the bootstrap token itself. Similarly, changing system preferences does not directly involve the secure token as it pertains to login authentication and access.