Abstract: A system controls security during operation of a computerized device by enforcing a first security policy during first operational state of the computerized device. Enforcement of the first security policy provides a first level access to resources within the computerized device by processes operating in the computerized device. The system detects a transition operation of the computerized device that occurs during enforcement of the first security policy indicating that operation of the computerized device is transitioning from the first operational state to a second operational state and in response, enforces a second security policy corresponding to the second operational state to provide a level of access to the resources within the computerized device that corresponds to the second operational state during operation of the second operational state. This can be repeated for many different states including boot time, normal runtime, installation, shutdown, and a compromised state.