Approved for publi c release; distribution un1imited DIRECTORATE OF COMPUTER SYSTEMS ENGINEERING DEPUTY FOR COMMAND AND MANAGEMENT SYSTEMS 20100827147 LEGAL NOTICE When U.S. Government drawings, specifications or other data are used for any purpose other than a definitely related government procurement operation, the government thereby incurs no responsibility nor any obligation whatsoeverj and the fact that the government may have formulated, furnished, or in any way supplied the said drawings, specifications, or other data is not to be regarded by implication or otherwise as in any manner licensing the holder or any other person or conveying any rights or permission to manufacture, use, or sell any patented invention that may in any way be related thereto. OTHER NOTICES Do not return this copy. Retain or destroy. REVIEW AND APPROVAL This technical report has been reviewed and is approved for publication.

Contlnu. on rarer., l id. if n.c.. .ay aid idantify by block number) khe various approaches to secure computer processing of classified information are summarized and contrasted. Dedicated processing, period processing, jobstream separation, multilevel security, and other approaches are cl~racterized according to cost and risk factors , and data-sharing capabilities.