Information Security Definitions

This glossary explains the meaning of key words and phrases that information technology (IT) and business professionals use when discussing IT security and related software products. You can find additional definitions by visiting WhatIs.com or using the search box below.

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  • L

    logon (or login)

    In general computer usage, logon is the procedure used to get access to an operating system or application, usually in a remote computer.

  • LUHN formula (modulus 10)

    The LUHN formula, also called modulus 10, is a simple algorithm used to validate the number on a credit card.

  • M

    macro virus

    A macro virus is a computer virus written in the same macro language used for software programs, including Microsoft Excel or word processors such as Microsoft Word.

  • madware

    Madware is a type of aggressive advertising that affects smartphones and tablets. The name, which is a portmanteau combining the words mobile and adware, was coined by the security vendor Symantec to describe a type of intrusive advertising that currently affects Android smartphones and tablets.

  • mail bomb

    A mail bomb is the sending of a massive amount of e-mail to a specific person or system.

  • Malicious Computer Code: Glossary

    This is a glossary of terms related to malicious computer code.

  • malvertisement (malicious advertisement or malvertising)

    A malvertisement (malicious advertisement) is an advertisement on the Internet that is capable of infecting the viewer's computer with malware.

  • malware (malicious software)

    Malware is software that is harmful to users or their computing systems. Find out about the different kinds of malware and what they can do.

  • Malware: Glossary

    This is a glossary of terms related to malware.

  • man in the browser

    Man in the browser refers to an emerging tactic used by hackers to commit financial fraud... (Continued)

  • man-in-the-disk (MITD) attack

    Man-in-the-disk (MITD) is an attack vector that allows an intruder to intercept and potentially alter data as it moves between Android external storage and an installed app.

  • mandatory access control (MAC)

    Mandatory access control (MAC) is a system-controlled policy restricting access to resource objects (such as data files, devices, systems, etc.) based on the level of authorization or clearance of the accessing entity, be it person, process, or device.

  • masquerade

    In general, a masquerade is a disguise.

  • MD2

    MD2 is an earlier, 8-bit version of MD5, an algorithm used to verify data integrity through the creation of a 128-bit message digest from data input (which may be a message of any length) that is claimed to be as unique to that specific data as a fingerprint is to the specific individual.

  • MD4

    MD4 is an earlier version of MD5, an algorithm used to verify data integrity through the creation of a 128-bit message digest from data input (which may be a message of any length) that is claimed to be as unique to that specific data as a fingerprint is to the specific individual.

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