From Citizendium, the Citizens' Compendium
- Information security : The set of policies and protective measures used to ensure appropriate confidentiality, integrity and availability to information; usually assumed to be information in a computer or telecommunications network but the principles extend to people and the physical world
- Denial of service : An attack on a computer or communications system that tries to prevent the system delivering its normal services to its users,
- Adware : Add brief definition or description
- Virus (computers) : A piece of malware that can exist only as part of another, authorized piece of software, which is an unauthorized consumer of resources on a computer; it may or may not propagate to other computers inside software sent to them
- Spyware : Malicious software that offers you services or may infiltrate quietly, and then clandestinely steals your personal details.
- Worm (computers) : A form of malware that can spread, among networked computers, without human interaction.
- Rootkit (computers) : The set of nasty things that an attacker installs on a computer system after he or she acquires administrator privileges, or in Unix terms "becomes root".
- : An apparently useful program with some nasty code concealed within it; if a user installs it, system security is breached.
- Nagware : Add brief definition or description
- Scareware : Add brief definition or description
- Botnet : A set of compromised computers which can collectively provide services to a "bot herder".
- Host intrusion detection system : Add brief definition or description
- Malware polymorphism : Methods by which malware, in the process of reproduction and propagation, alters new copies in a way that makes them difficult to be recognized by defensive software
- Miscreant : One who enters a computer or computer network without authorization by the owner or administrator, regardless of the motivation for entry
- Network intrusion detection system : Add brief definition or description
- Phishing : Use of online social engineering methods in order to persuade a victim to part with personal details such as online banking logins, in order to perpetrate fraud.
- Social engineering : Subverting a security system by deceiving its users.