centralized operationOperation of a communication network in which transmission may occur between the control station and any tributary station, but not between tributary…
centralized ordering group (COG)An organization provided by some communications service providers to coordinate services between the companies and vendors.
Centrex® (CTX) serviceA service offered by Bell Operating Companies that provides functions and features comparable to those provided by a PBX or a PABX. Note: "Centrex® C.O.
Certificate Authority certificateA binary file stored on the CA server's hard drive that contains a public key, a name, and a digital signature.
certificate holdIn cryptography, an order suspending the use of a certificate. Note: A certificate hold is a security procedure that is analogous to placing a hold on a…
certificate informationIn cryptography, the information in a certificate which is signed. [After X9.57]
certificate management[The] process whereby certificates . . . are generated, stored, protected, transferred, loaded, used, and destroyed. [INFOSEC-99]
Certificate Policy (CP)A Certificate Policy is a specialized form of administrative policy tuned to electronic transactions performed during certificate management.
certificate serial numberIn cryptography, an integer value that is (a) unique within the issuing certificate authority (CA), and (b) unambiguously associated with a certificate…
Certificate ServicesA software service that issues certificates for a particular certification authority (CA).
Certificate Status AuthorityA trusted entity that provides on-line verification to a Relying Party of a subject certificate's trustworthiness, and may also provide additional…
certificate subjectAn identifier for the certificate owner, e.g. "/DC=org/DC=doegrids/OU=People/CN=John Doe 123456".
certificate userIn cryptography, a station, agency, or individual user that needs to know, with certitude, the public key of another entity. [After X.509]
CertificationCertification means the approval by a certifying official that a labor condition application is complete and does not contain obvious inaccuracies.
Certification AgentThe individual, group, or organization responsible for conducting a security certification.
Certification and Accreditation (C&A)A comprehensive assessment of the management, operational, and technical security controls in an information system, made in support of security…
certification authority (CA)In cryptography, a center trusted by one or more agencies or individuals to create and assign certificates and, optionally, to create user's keys.
Certification Authority FacilityThe collection of equipment, personnel, procedures and structures that are used by a Certification Authority to perform certificate issuance and…
certification pathIn cryptography, the ordered sequence of entity certificates that can be processed, with the public key of the initial entity in the path, to determine…
Certification Practice Statement (CPS)A statement of the practices that a Certification Authority employs in issuing, suspending, revoking and renewing certificates and providing access to…
certified copyA copy of a document attested to be a true copy by the official custodian of the original document
certified identityAn identity in the form of an attribute in a certificate. The issuing authority will have authenticated the owner of the certificate [ECMA138].
certified network engineerIn computer networking, one who has met proprietary training and certification requirements pertinent to network design or maintenance.
CertifierPerson responsible for certification of a system and/or product [CESG]
certifier IDA file that generates an electronic "stamp" that indicates a trust relationship.
CES(1) Cost Element Structure. (2) Civil Engineering Squadron.
cesium clockA clock containing a cesium standard as a frequency-determining element.
cesium standardA primary frequency standard in which electronic transitions between the two hyperfine ground states of cesium-133 atoms control the output frequency.
CESTCINC Exercise Support Team (BM/C3 warfighter exercise term).
CFR (Code of Federal Regulations)A codification of rules, including those relating to recordkeeping, published in the Federal Register by the executive and other branches of the federal…
CGIAbbreviation for common gateway interface. A means for allowing programs or scripts (usually written in C++ or Perl) to add functionality to the World…
CGI (Common Gateway Interface)Abbreviation for Common Gateway Interface (CGI). CGI is a standard that connects external programs with information servers such as Web servers or HTTP…
CGI ProgramStrictly, any program which handles its input and output data according to the CGI standard.
Cgi-bina "virtual" directory contained in URLs indicates a CGI (Common Gateway Interface) script is in use.
cgmAbbreviation for computer graphics metafile. A digital file format (standard) used for the storage or transmission of digital representations of graphics…
CGS(1) Common Ground Station (Part of Joint STARS). (2) Continental Ground Station.
Chaff(1) Radar confusion reflectors, which consist of thin, narrow metallic strips of various lengths and frequency responses, used to create false echoes for…
Chaff PuffVolume of space containing a relatively high density of chaff.
chain indexA hierarchy of terms in a classification scheme that progresses from general to specific terms (e.g.
Chain of CustodyA process used to maintain and document the chronological history of electronic evidence.
chain server topologyConnects servers one-to-one, end-to-end. Information travels along the chain and then back.
Chairmans Program Assessment (CPA)Summarizes the views of the Chairman, Joint Chiefs of Staff, on the balance and capabilities of the Program Objective Memorandum (POM) force and the…
challenge and reply authentication[A] prearranged procedure in which a subject requests authentication of another, and the latter establishes validity with a correct reply. [INFOSEC-99]
Challenge ResponseA method used to confirm the presence of a person by eliciting direct responses from the individual. Responses can be either voluntary or involuntary.
Challenge-Response ProtocolAn authentication protocol where the verifier sends the claimant a challenge (usually a random value or a nonce) that the claimant combines with a shared…
change backThe procedure of transferring signaling traffic from alternative signaling link(s) to the signaling link which has become available as a result of having…
change logThe log where the quorum resource stores data. This data is maintained by the clustering software.
Change of Operational Control (CHOP)The date and time at which the responsibility for operational control of a force or unit passes from one operational control authority to another.
Change OrderUnilateral written order to a contractor to modify a contractual requirement within the scope of the contract, pursuant to the changes clause contained in…
changeoverThe procedure of transferring signaling traffic from one signaling link to one or more different signaling links, when the link in use fails or is…
ChannelThe bed of a stream or river. This can also refer to a submerged stream or river channel in a reservoir.
channel bankThe part of a carrier-multiplex terminal that performs the first step of modulation by multiplexing a group of channels into a higher bandwidth analog…
channel bitsBinary data transmitted over a communications link. Note: Channel bits are derived from user information by FEC (forward error correction) coding and…
channel capacity1. The maximum possible information transfer rate through a channel, subject to specified constraints. 2.
channel gateA device for connecting a channel to a highway, or a highway to a channel, at specified times.
channel noise levelThe ratio of the channel noise at any point in a transmission system to an arbitrary level chosen as a reference.
channel offsetThe constant frequency difference between a channel frequency and a reference frequency which may frequency hop.
channel packingMaximizing the use of voice frequency channels for data transmission by multiplexing a number of channels of lower data rate into a single voice frequency…
channel reliability (ChR)The percentage of time a channel was available for use in a specified period of scheduled availability.
channel service unit (CSU)A line bridging device that (a) is used to perform loop-back testing, (b) may perform bit stuffing, (c) may also provide a framing and formatting pattern…
channel time slotA time slot that starts at a particular instant in a frame and is allocated to a channel for transmitting data, such as a character or an in-slot signal.
channel-associated signalingSignaling in which the signals necessary to switch a given circuit are transmitted via the circuit itself or via a signaling channel permanently…