Denial of Service

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National Definitions


Denial of service: Deliberate compromise of the availability of IT systems. [1]

Denial-of-Service (DoS): An attack that is used to stop an online system (such as a website) from being available to legitimate users. [2]
These attacks often flood targeted systems with requests until they are unable to respond.


Déni de service (Deny of service ou Denial of Service ou DoS): Ensemble de techniques d’attaques, venant d’une même source, ayant pour but d’interrompre la fonction d’un serveur et de le rendre indisponible. [3]
La méthode la plus classique consiste à faire crouler le serveur sous une masse de requêtes généralement mal formées pour entraîner une réponse anormale et paralysante. Une attaque distribuée venant de plusieurs sources est appelée DDoS.
DoS, DDoS, Sabotage: By this kind of an attack a system is bombarded with so many packets that the operations are delayed or the system crashes. [4]
Examples of a remote DoS are SYS-a. PING-flooding or E-mail bombing (DDoS: TFN, Trinity, etc.) However, the availability also can be affected by local actions (destruction, disruption of power supply, etc.).


Déni de service (DoS): attaque informatique ayant pour but de rendre indisponible un service en submergent ses ressources informatiques de traffic inutile. Lorsque l'attaque est conduite à l'aide de plusieurs source de traffic malveillant, on parle de déni de service distribué (DDoS). [5]


Denial-of-service attack: Flooding the networks or servers of individuals or organizations with false data requests so they are unable to respond to requests from legitimate users. [6]


Denial of Service is de benaming voor een type aanval die een bepaalde dienst (bijvoorbeeld een website) niet beschikbaar maakt voor de gebruikelijke afnemers. Bij websites wordt meestal een DDoS-aanval uitgevoerd. [7]

Distributed Denial of Service (DDoS) is een vorm van DoS waarbij een bepaalde dienst (bijvoorbeeld een website) niet beschikbaar wordt gemaakt door deze te bestoken met veel netwerkverkeer vanuit een groot aantal verschillende bronnen. [7]


Dénis de services distribués (« DDoS »: un type d’attaque rendant un service inaccessible aux bénéficiaires habituels du service. Il s’agit d’ne technique perturbant fortement le fonctionnement normal du système par un grand nombre de requêtes. [8]


Denial of Service (Deny of Service or DoS): A set of attacking techniques, coming from the same source, intended to interrupt the function of a server and make it unavailable. [9]
The most common method is to cram the server under a mass of queries usually poorly formed to cause an abnormal response and paralyzing. A distributed attack from multiple sources is called DDoS.

United Kingdom

Distributed denial-of-service attack: Where many networked devices try to communicate with another at the same time, causing the targeted device to be significantly slower to respond or cease to function. [10]

United States

Denial of Service is an attack that prevents or impairs the authorized use of information system resources or services. [11]

Distributed denial of service is a Denial of Service technique that uses numerous systems to perform the attack simultaneously. [11]

Denial of Service: Actions that prevent the system from functioning in accordance with its intended purpose (from: NIST SP 800-24) [12]

Denial of Service: The prevention of authorized access to resources or the delaying of time-critical operations. (Time-critical may be milliseconds or it may be hours, depending upon the service provided) (from: NIST SP 800-27 Rev A) [12]

Denial of Service: The prevention of authorized access to resources or the delaying of time-critical operations. (from: NIST SP 800-33) [12]

See also


  1. Protective Security Policy Framework - Glossary Oct 2017
  2. on-line glossary Stay Safe On-line
  3. CIRT-BF Glossary
  4. CIRT-BF Glossary
  5. Revue stratégique de cyberdéfense 12 février 2018
  6. Government of Liberia’s Policy for the Telecommunications and Information Communications Technology (ICT) sectors
  7. 7.0 7.1 Cyber Security Beeld Nederland 2018
  9. ANSI Glossary
  10. Secure by Design: Improving the cyber security of consumer Internet of Things Report (2018)
  11. 11.0 11.1 DHS/NICSS Glossary
  12. 12.0 12.1 12.2 NIST Glossary