Partitioning Communication System

Partitioning Communication System is a computer and communications security architecture based on an information flow separation policy. The PCS extends the four foundational security policies of a MILS software architecture to the network:

End-to-end Information Flow
End-to-end Data Isolation
End-to-end Periods Processing
End-to-end Damage Limitation

The PCS leverages software separation to enable application layer entities to enforce, manage, and control application layer security policies in such a manner that the application layer security policies are:

Non-bypassable
Evaluatable
Always-invoked
Tamper-proof

The result is a communications architecture that allows a software separation kernel and the PCS to share responsibility of security with the application.
The PCS was invented by OIS. OIS collaborated extensively on the requirements for the PCS with:

National Security Agency
Air Force Research Laboratory
University of Idaho
Lockheed Martin
Boeing
Rockwell Collins