Software, ContinuedLevel ILevel I data (classified) handling requirements and procedures are similar tothose for handling hard copy classified material. You are responsible forsafeguarding this information at all times. Within Level I, the four modes ofsecure electronic processing of classified data are system high, dedicated,multilevel, and controlled mode. The following table specifically defines thefour security modes:ModeSystem highDefinitionAll computers on the network and connectedperipherals protect data according to therequirements for the highest classification categoryand type of material contained in the system. Systemhigh requires a security clearance but not necessarilya need-to-know for all material in the system.DedicatedSpecific users or a group of users with a securityclearance and a need-to-know for the processing of aparticular type of classified material exclusively useand control all of the computers and peripherals on asystem.MultilevelVarious types and categories of classified materialstored and processed concurrently in a computersystem that permits selective access to material byuncleared users and users with differing securityclearances and need-to-know. This is a function ofthe operating system and associated system software.ControlledA computer system in which at least some users withaccess to the system have neither a security clearancenor a need-to-know for all classified material in thesystem.Continued on next page8-9
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