Information Security Definitions

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  • C

    CAPTCHA (Completely Automated Public Turing Test to Tell Computers and Humans Apart)

    A CAPTCHA (Completely Automated Public Turing Test to Tell Computers and Humans Apart) is a type of challenge-response system designed to differentiate humans from robotic software programs.

  • capture

    Capture is the process or means of obtaining and storing external data, particularly images or sounds, for use at a later time.

  • card-not-present fraud (card-not-present transaction)

    Card-not-present (CNP) fraud is the unauthorized use of a payment card to conduct a card-not-present transaction when the cardholder cannot or does not physically present the card at the time of the transaction.

  • cardholder data (CD)

    Cardholder data (CD) refers to the primary account number (PAN) of a payment card belonging to a cardholder, along with any of the following data types: cardholder name, expiration date or service code (a three- or four-digit number coded onto the magnetic-stripe that specifies acceptance requirements and limitations for a magnetic-stripe-read transaction).

  • cardholder data environment (CDE)

    A cardholder data environment or CDE is a computer system or networked group of IT systems that processes, stores and/or transmits cardholder data or sensitive payment authentication data, as well as any component that directly connects to or supports this network.

  • Carnivore

    Carnivore was an Internet surveillance system developed for the U.S. Federal Bureau of Investigation (FBI) so that they could monitor the electronic transmissions of criminal suspects. Critics, however, charged that Carnivore did not include appropriate safeguards to prevent misuse and might violate the constitutional rights of the individual. The Electronic Privacy Information Center (EPIC) reported in early 2005 that the FBI had replaced Carnivore with other unspecified surveillance software from commercial sources. Such software usually includes a packet sniffer.

  • CCMP (Counter Mode with Cipher Block Chaining Message Authentication Code Protocol)

    Counter Mode with Cipher Block Chaining Message Authentication Code Protocol (CCMP) is an encryption protocol that forms part of the 802.11i standard for wireless local area networks (WLANs), particularly those using WiMax technology... (Continued)

  • certificate authority (CA)

    A certificate authority (CA) is a trusted entity that issues electronic documents that verify a digital entity’s identity on the Internet.

  • Certificate Revocation List (CRL)

    A Certificate Revocation List (CRL) is a list of digital certificates that have been revoked by the issuing Certificate Authority and should not be trusted. Web browsers use CRLs to determine whether a website's digital certificate is still valid and trustworthy.

  • certified information security manager (CISM)

    Certified Information Security Manager (CISM) is a certification offered by ISACA, a nonprofit, independent association that advocates for professionals involved in information security, assurance, risk management and governance.

  • Certified Information Systems Auditor (CISA)

    Certified Information Systems Auditor is a credential that demonstrates an IT professional's ability to assess risk and institute technology controls. The certification is intended for IT auditors, audit managers, consultants and security professionals.

  • Certified Information Systems Security Professional (CISSP)

    Certified Information Systems Security Professional (CISSP) is an information security certification developed by the International Information Systems Security Certification Consortium, also known as (ISC)².

  • chaffing and winnowing

    Chaffing and winnowing are dual components of a privacy-enhancement scheme that does not require encryption.

  • challenge-response system

    A challenge-response system is a program that replies to an e-mail message from an unknown sender by subjecting the sender to a test (called a CAPTCHA) designed to differentiate humans from automated senders.

  • Chameleon Card

    The Chameleon Card is a programmable card in development at Chameleon Network that can represent each of the owner's credit, debit, and customer cards as required, making it unnecessary to carry all of the aforementioned.

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