Methods and systems described herein relate to enhancing security on a device by configuring one or more software functions in a trusted zone of a processor using object firewalls, IPC mechanisms, and/or a policy engine. An inter-process communication mechanism and inter-process communication bus enable secure inter-process communication between inter-process communication applications within the trusted zone and inter-process communication applications external to the trusted zone. Adapting, filtering, blocking, redirecting, or otherwise modifying inter-process communications is enabled by the inter-process communications mechanism. Modifications may be controlled by a policy engine within the trusted zone.