Glossary
D
A small network with one or more servers that is kept separate from the core network, either on the outside of the firewall, or as a separate network protected by the firewall. Demilitarised zones usually provide information to less trusted networks, such as the internet.
When legitimate users are denied access to computer services or resources, usually due to the service being overloaded with requests.
An action taken by an adversary to prevent legitimate access to online services (typically a website), for example, by consuming the amount of available bandwidth or the processing capacity of the server hosting the online service.
An application that can be used to prevent removable media and mobile devices from being connected to workstations and servers via external communication interfaces.
Software used on a system to restrict access to communications ports. It can block all access to a communications port or allow access based on device types, manufacturer’s identifications, or unique device identifiers.
Diffie-Hellman
Where cyber actors attempting to access a password-protected system or device apply ‘password dictionaries’ or long lists of the most commonly-used passwords and character combinations systematically against a password entry in order to guess it and break into a system.
An electronic document used to identify an entity, like an individual, server, system, company, and to associate a public key with that entity. A digital certificate is issued by a Certification Authority (CA) and is digitally signed by that authority.
The unique set of traceable activities, actions, contributions and communications – in aggregation or isolation – that are manifested on the internet or on digital devices.
The coordinated and ongoing set of processes and activities that ensure long-term, error-free storage of digital information, with means for retrieval and interpretation, for the time span the information is required