The process of selecting optional parts of an operating system and of creating a particular operating system tailored to the requirements of a data processing installation.

1. [An] information system (IS) security mode of operation wherein each user, with direct or indirect access to the information system (IS), its peripherals, remote terminals, or remote hosts, has all of the following: (a) valid security clearance for all information within an IS; (b) formal access approval and signed nondisclosure agreements for all the information stored and/or processed (including… (Read More →)

[A] symbol or group of symbols in an off-line encrypted message identifying the specific cryptosystem or key used in the encryption. [INFOSEC-99]

The progressive linking and testing of system components to merge their functional and technical characteristics into a comprehensive, interoperable system.
Note: Integration of data systems allows data existing on disparate systems to be shared or accessed across functional or system boundaries.

1. That condition of a system wherein its mandated operational and technical parameters are within the prescribed limits.
2. [The] Attribute of an information system (IS) when it performs its intended function in an unimpaired manner, free from deliberate or inadvertent unauthorized manipulation of the system. [INFOSEC-99]

A bilateral memorandum of agreement between two System Managers on the security aspects of an interconnection between their two systems [CESG]. See also: Community Security Policy.

The interface between application platform service components within that platform; it may be standardized or non-standard [POSIX.0].

A key used to provide privacy to an encrypted object as it transits a communications network. [After X9.69]

The course of developmental changes through which a system passes from its conception to the termination of its use and subsequent salvage.
Note: For example, a system life cycle might include the phases and activities associated with the analysis, acquisition, design, development, test, integration, operation, maintenance, and modification of the system.

In a frequency-division multiplexed (FDM) transmission system, the absolute power level of the composite signal transmitted in one direction.
Note 1: The absolute power level is referred to a zero transmission level point (0TLP).
Note 2: The composite signal contains signaling, speech, and digital signals.