cooperative key generationElectronically exchanging functions of locally generated, random components, from which both terminals of a secure circuit construct traffic encryption…
coordinated clockOne of a set of clocks distributed over a spatial region, producing time scales that are synchronized to the time scale of a reference clock at a…
Coordinated ConversionA process whereby a portion of the equipment or facilities from an existing service is to be reused in a replacement service.
coordinated time scaleA time scale synchronized within given tolerances to a reference time scale.
Coordinated Universal Time (UTC)By international agreement, the local time at the prime meridian, which passes through Greenwich, England.
coordination areaThe area associated with an Earth station outside of which a terrestrial station sharing the same frequency band neither causes nor is subject to…
coordination contour1. The line enclosing the coordination area. [NTIA] [RR] 2. The perimeter of the coordination area.
coordination distanceDistance on a given azimuth from an Earth station beyond which a terrestrial station sharing the same frequency band neither causes nor is subject to…
copyA reproduction of an original document See also duplication.
copy watchA radio- or video-communications watch in which an operator is required to maintain a continuous receiver watch and to keep a complete log.
copy-protectedOf a data medium such as a diskette, pertaining to the use of one or more schemes designed to thwart copying in violation of copyright law or security…
cord circuitA switchboard circuit in which a plug-terminated cord is used to establish connections manually between user lines or between trunks and user lines.
cord lampThe lamp associated with a cord circuit that indicates supervisory conditions for the respective part of the connection.
cordless switchboardA telephone switchboard in which manually operated keys are used to make connections.
Core(Kor) the central part of anything, such as the central mass of necrotic matter in a boil.
core areaThe part of the cross-sectional area of an optical fiber within which the refractive index is everywhere greater than that of the innermost homogeneous…
core diameterIn the cross section of a realizable optical fiber, ideally circular, but assumed to a first approximation to be elliptical, the average of the diameters…
core dumpThe corpse of a "process", in the form of a file left in the "working directory" of the process, usually as a result of certain kinds of fatal error.
Corner Reflector(1) A device, normally consisting of three metallic surfaces or screens perpendicular to one another, designed to act as a radar target or marker.
corrective maintenanceMaintenance actions carried out to restore a defective item to a specified condition. 2.
CorrectnessA property of a representation of a Target of Evaluation such that it accurately reflects the stated security target for that system or product [ITSEC].
correctness proofA mathematical proof of consistency between a specification and its implementation. [INFOSEC-99]
corresponding entitiesPeer entities with a lower layer connection among them. [T1.629-1999]
COSINEAbbreviation for Cooperation for Open Systems Interconnection Networking in Europe.
cositeCollocation of electronic equipment on the same vehicle, station, or base. Note: Equipment so located is often subject to interference because of its…
cosmic noiseRandom noise that originates outside the Earth's atmosphere. Note: Cosmic noise characteristics are similar to those of thermal noise.
Costas loopA phase-locked loop used for carrier phase recovery from suppressed-carrier modulation signals, such as from double-sideband suppressed carrier signals.
Coulomb's lawThe universal law of attraction and repulsion of electric charges.
CountermeasureA design or procedural measure taken against covert or overt attacks.
counterpoiseA conductor or system of conductors used as a substitute for earth or ground in an antenna system. [From Weik '89]
country code1. In international direct telephone dialing, a code that consists of 1-, 2-, or 3-digit numbers in which the first digit designates the region and…
coupled bonding conductorA conductor used to extend the ground at an approved building entrance facility to certain types of ac-powered equipment.
coupled modesIn fiber optics, a mode that shares energy among one or more other modes, all of which propagate together.
couplingThe phase state in which either two dominant or two recessive alleles of two different genes occur on the same chromosome. Synonym: cis configuration.
coupling coefficientA number that expresses the degree of electrical coupling that exists between two circuits.
coupling efficiencyIn fiber optics, the efficiency of optical power transfer between two optical components.
coupling lossThe loss that occurs when energy is transferred from one circuit, circuit element, or medium to another.
coverNatural or manmade objects on the bottom of lakes, rivers, or impoundments, especially those that influence fish behavior.
coverageThe scope of protection provided by an insurance contract which includes any of the listed benefits in an insurance policy.
covert channel1. A transmission channel that may be used to transfer data in a manner that violates security policy. [2382-pt.8] 2.
covert storage channel1. [A] covert channel involving the direct or indirect writing to a storage location by one process and the direct or indirect reading of the storage…
Covert Timing ChannelA covert channel in which one process signals information to another by modulating its own use of system resources in such a way that this manipulation…
credentialDetailed information, which is acquired during authentication, that describes the user, any group associations, and other security-related identity…
CRENAbbreviation for Corporation for Research and Educational Networking. The organization resulting from the merger of BITNET and the academic computer…
crest factorThe peak-to-rms voltage ratio of an alternating current (ac) signal. [T1.401-1988]
critical angleIn geometric optics, at a refractive boundary, the smallest angle of incidence at which total internal reflection occurs.
critical areaAn operational area that requires specific environmental control because of the equipment or information contained therein.
critical frequencyIn radio propagation by way of the ionosphere, the limiting frequency at or below which a wave component is reflected by, and above which it penetrates…
critical infrastructureElements of a system that are so vital that disabling any of them would incapacitate the entire system. 2.
critical mechanismA mechanism within a Target of Evaluation whose failure would create a security weakness [ITSEC].
critical technical loadThat part of the total technical power load required for synchronous communications and automatic switching equipment.
critical wavelengthThe free-space wavelength that corresponds to the critical frequency. Note: The critical wavelength is equal, in meters, to the speed of light (3 × 108…
CRLAbbreviation for certificate revocation list. In cryptography, a list of revoked certificates.
cross assemblerAn assembler that can run symbolic-language input on one type of computer and produce machine-language output for another type of computer.
cross certificationEnables organizations to establish trust with other organizations so that users can verify the digital signature of messages sent by users in other…
cross couplingThe coupling of a signal from one channel, circuit, or conductor to another, where it is usually considered to be an undesired signal.
cross modulationIntermodulation caused by the modulation of the carrier of a desired signal by an undesired signal.
cross office checkA check made across the exchange to verify that an acceptable speech path exists. [T1.226-1992]
cross-band radiotelegraph procedureA radiotelegraph network operational procedure in which calling stations, such as ship stations, call other stations, such as shore stations, using one…
cross-connectionConnections between terminal blocks on the two sides of a distribution frame, or between terminals on a terminal block.
cross-office trunkA trunk that has its terminations within a single facility.
cross-platformPertaining to software that will run on more than one operating system (i.e., on more than one platform).
cross-polarized operationThe operation of two transmitters on the same frequency, but with polarizations in the opposite sense, e.g.
cross-site linkIn a satellite communications system, the signal power and control connections between the components of an Earth station.
crossbar switchA switch that has a plurality of vertical paths, a plurality of horizontal paths, and electromagnetic means, i.e.
crossfade1. In audio programming, recording, or mixing, to combine signals in such a manner that one channel or source fades out as another fades in, while…
crosspointA single element that (a) is in the array of elements that compose a switch and (b) consists of a set of physical or logical contacts that operate…
crosstalk (XT)1. Undesired coupling of a signal from one circuit, part of a circuit, or channel, to another. 2.
crosstalk couplingThe ratio of the power in a disturbing circuit to the induced power in the disturbed circuit observed at specified points of the circuits under specified…
Cryptanalysis1) Operations performed in defeating cryptographic protection without an initial knowledge of the key employed in providing the protection.