system mode - definition. What is system mode
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System High Mode

System high mode         
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.
Airplane mode         
  • Airplane mode icon
  • Airplane mode in a laptop keyboard
  • Smartphone with airplane mode turned on
SETTING AVAILABLE ON MANY ELECTRONIC DEVICES
Flight Mode; Offline Mode; Flight mode; Airplane Mode; Plane mode; Aeroplane mode; Aeroplane Mode
Airplane mode (also known as aeroplane mode, flight mode, offline mode, or standalone mode) is a setting available on smartphones and other portable devices. When activated, this mode suspends the device's radio-frequency (RF) signal transmission technologies (i.
Unreal mode         
VARIANT OF REAL MODE IN X86 COMPUTING
Big real mode; Flat real mode; Paged real mode; Huge real mode; 32-bit real mode; Big unreal mode; Huge unreal mode; Real big mode; Voodoo Memory Manager; Voodoo Memory Management; Voodoo Memory Management System; Real Big Mode; Big Real Mode; Flat Real Mode; HugeRealMode; HugeRealMode driver; Pseudo real execution mode; Unreal execution mode; 386 real big mode; 386 Real Big Mode; 386 big mode; 386 Big Mode; Real-mode flat memory model; Pseudo-real execution mode; Pseudo real mode; Pseudo-real mode; Unreal Mode
In x86 computing, unreal mode, also big real mode, huge real mode, flat real mode, or voodoo mode is a variant of real mode, in which one or more segment descriptors has been loaded with non-standard values, like 32-bit limits allowing access to the entire memory. Contrary to its name, it is not a separate addressing mode that the x86 processors can operate in.

ويكيبيديا

System high mode

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.