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Statements

Subject Item
dbr:System_High_Mode
dbo:wikiPageWikiLink
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dbr:System_high_mode
Subject Item
dbr:System_high_mode
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yago:Act100030358 yago:WikicatComputerSecurityProcedures yago:Event100029378 dbo:Single yago:YagoPermanentlyLocatedEntity yago:Activity100407535 yago:Procedure101023820 yago:Abstraction100002137 yago:PsychologicalFeature100023100
rdfs:label
System high mode
rdfs:comment
System high mode, or simply system high, is a security mode of using an automated information system (AIS) that pertains to an environment that contains restricted data that is classified in a hierarchical scheme, such as Top Secret, Secret and Unclassified. System high pertains to the IA features of information processed, and specifically not to the strength or trustworthiness of the system.
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dbc:Computer_security_procedures
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dbo:wikiPageRevisionID
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dbr:Secret dbr:Cross-domain_solution dbr:Automated_information_system dbr:Unclassified dbr:Top_Secret dbc:Computer_security_procedures dbr:Multilevel_security dbr:TCSEC
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dbo:abstract
System high mode, or simply system high, is a security mode of using an automated information system (AIS) that pertains to an environment that contains restricted data that is classified in a hierarchical scheme, such as Top Secret, Secret and Unclassified. System high pertains to the IA features of information processed, and specifically not to the strength or trustworthiness of the system. System high mode is distinguished from other modes (such as multilevel security) by its lack of need for the system to contribute to the protection or separation of unequal security classifications. In particular, this precludes use of the features of objects (e.g. content or format) produced by or exposed to an AIS operating in system high mode as criteria to securely downgrade those objects. As a result, all information in a system high AIS is treated as if it were classified at the highest security level of any data in the AIS. For example, Unclassified information can exist in a secret system high computer but it must be treated as secret, therefore it can never be shared with unclassified destinations (unless downgraded by reliable human review, which itself is risky because of lack of omniscient humans.) There is no known technology to securely declassify system high information by automated means because no reliable features of the data can be trusted after having been potentially corrupted by the system high host. When unreliable means are used (including cross-domain solutions and bypass guards) a serious risk of system exploitation via the bypass is introduced. Nevertheless, it has been done where the resulting risk is overlooked or accepted. Example: When Daniel is granted access to a computer system that uses System High mode, Daniel must have a valid security clearance for all information processed by the system and valid "need to know" for some, but not necessary all, informations processes by the system.
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dbr:Mode
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dbr:Multilevel_security
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dbr:Security_modes
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dbr:System_high_mode