Partitioning Communication System
# 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 (Multiple Independent Levels of Security) 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
