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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

• citerefvanfleetlukebeckwithtaylor2005Vanfleet, W. Mark; Luke, Jahn A.; Beckwith, R. William; Taylor, Carol; Calloni, Ben; Unchenick, Gordon (August 2005). "MILS - Architecture for High-Assurance Embedded Computing". Crosstalk (Aug 2005). Archived from the original on 2007-03-19.

• Presentation at OMG Software Based Communications Workshop

• citerefbeckwithBeckwith, R. William. "MILS Partitioning Communication System". Objective Interface Systems, Inc. Archived from the original on 2007-09-28.