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International Definitions

EU COM (2013)343

[Nuclear]‘Defence-in-depth’ means a hierarchical deployment of different levels of diverse equipment and procedures to prevent the escalation of anticipated operational occurrences and to maintain the effectiveness of physical barriers placed between a radiation source or radioactive material and workers, members of the public or the air, the water and the soil, in operational states and, for some barriers, in accident conditions. [1]


Defence in depth is implementing several layers of defence, including both administrative aspects (procedures, instructions, sanctions, access control rules, confidentiality rules) and technical aspects (multiple layers of protection together with measures for detection and delay) that adversaries would have to overcome or circumvent to achieve their objectives. [2]

Defence in depth is the combination of multiple layers of systems and measures that have to be overcome or circumvented before nuclear security is compromised.

National Definitions


[Nuclear] "verdediging in de diepte": een hiërarchische inzet van verschillende niveaus van diverse apparatuur en procedures om de escalatie van verwachte operationele gebeurtenissen te voorkomen en de doeltreffendheid van de fysieke barrières, die geplaatst zijn tussen een stralingsbron of een radioactief materiaal en de werkers, het publiek en de lucht, het water en de bodem, te handhaven in gewone bedrijfsomstandigheden en, wat sommige barrières betreft, in ongevalssituaties. [3]


Defence-in-depth: An IT security concept (also known as the Castle Approach) in which multiple layers of security are used to protect the integrity of information. These layers can include antivirus and antispyware software, firewalls, hierarchical passwords, intrusion detection, and biometric identification. [4]

Défense en profondeur: Mesure de sécurité des TI consistant à établir de multiples couches de protection pour assurer l’intégrité de l’information. Ces couches de protection sont généralement constituées de logiciels antivirus, d’anti logiciels espions, de coupe feu, de mots de passe hiérarchiques, de mesures de détection des intrusions et de données biométriques. [5]

Hong Kong

縱深防禦是利用多層次的資訊保安措施,以在單一保安組件發 生故障時作出保護。

Defence-in-Depth is the approach of using multiple layers of security to guard against failure of a single security component. [6]


Defense In-Depth is the approach of using multiple layers of security to guard against failure of a single security component. [7]


Defence in Depth (DID): The application of multiple security measures that span multiple domains (physical, personnel, technical, etc.) to protect an asset or data or system. [8]

United Arab Emirates

Defence in Depth: The strategy of forming layers of protection for an asset. [9]

United States

Defense-in-Depth is an information security strategy integrating people, technology, and operations capabilities to establish variable barriers across multiple layers and missions of the organization. [10]

Standard Definition


Defense-in-depth is the provision of multiple security protocols, especially in layers, with the intent to delay if not prevent an attack. [11]

Other definitions


Defense-in-depth: A principle for building systems stating that multiple defensive mechanisms at different layers of a system are usually more secure than a single layer of defense. [12]

See also


  1. COUNCIL DIRECTIVE amending Directive 2009/71/EURATOM establishing a Community framework for the nuclear safety of nuclear installations COM (2013)343
  2. IAEA - Nuclear Security Series Glossary Version 1.3 (November 2015)
  3. EU RICHTLIJN VAN DE RAAD houdende wijziging van Richtlijn 2009/71/EURATOM tot vaststelling van een communautair kader voor de nucleaire veiligheid van kerninstallaties COM 2013/343
  4. Glossary - Canadian Centre for Cyber Security
  5. Glossaire - Centre Canadien pour la Cybersécurité
  6. Information Security Glossary
  7. Oman CERT Glossary
  8. NHS Cyber security glossary
  9. Abu Dhabi Safety and Security Planning Manual
  10. NIST Special Publication 800-53 Rev 4: Security and Privacy Controls for Federal Information Systems and Organizations (April 2013)
  11. ISA99 Committee Master Glossary.
  12. OWASP Glossary