centrex
Short for central office exchange service, a type of PBX service in which switching occurs at a local telephone station instead of at the company premises. Typically, the telephone company owns and manages all the communications equipment necessary to implement the PBX and then sells various services to the company.
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- certification
In computer-based training (CBT) also called computer-assisted instruction (CAI), certification refers to both the program and the process a student must go through to obtain certification in the studied area. Certification also includes testing and assessment that must be met by the learner with a minimum acceptable score.
- certification authority
Abbreviated as CA, a trusted third party organization or company that issues digital certificates used to create digital signatures and public-private key pairs. The role of the CA in this process is to guarantee that the individual granted the unique certificate is, in fact, who he or she claims to be. Usually, this means that […]
- chad
Confetti-like pieces of paper formed from punch cards or paper tapes. May have been derived from the word Chadless keypunch, which did not create the confetti-like substance; therefore, it was assumed the stuff created must then be called chad. U.S. Navy teletype machines produced chad from paper tape since before the Korean War. Chad was […]
- chain e-mail
Chain e-mails are those that, in the body or subject of the message, asks the recipient to forward the e-mail on to multiple people. Many chain letter e-mails are hoaxes and are often considered to be a security and privacy risk. If the message is forwarded on by a person, it will usually show the […]
- challenge-response
(1) A common authentication technique whereby an individual is prompted (the challenge) to provide some private information (the response). Most security systems that rely on smart cards are based on challenge-response. A user is given a code (the challenge) which he or she enters into the smart card. The smart card then displays a new […]