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1. something given or pledged to secure the fulfilment of a promise or obligation
2. a person who undertakes to fulfil another person's obligation
3. the protection of data to ensure that only authorized personnel have access to computer files


(computer science)
The existence and enforcement of techniques which restrict access to data, and the conditions under which data may be obtained.
The ability of an electric power system to suitably respond to disturbances arising within that system, including both local and widespread disturbances and the loss of major generation and transmission facilities.
Measures taken by a command to protect itself from espionage, observation, sabotage, annoyance, or surprise.
A condition which results from the establishment and maintenance of protective measures which ensure a state of inviolability from hostile acts or influences.
Protection of supplies or supply establishments against enemy attack, fire, theft, and sabotage.


A combination of measures and human and material resource intended to safeguard international civil aviation against acts of unlawful interference (ICAO).


Protection against unauthorized access to, or alteration of, information and system resources including CPUs, storage devices and programs.

Security includes:

* confidentiality - preventing unauthorized access; integrity - preventing or detecting unauthorized modification of information.

* authentication - determining whether a user is who they claim to be.

* access control - ensuring that users can access the resources, and only the resources, that they are authorised to.

* nonrepudiation - proof that a message came from a certain source.

* availability - ensuring that a system is operational and accessible to authorised users despite hardware or software failures or attack.

* privacy - allowing people to know and control how information is collected about them and how it is used.

Security can also be considered in the following terms:

* physical security - who can touch the system to operate or modify it, protection against the physical environment - heat, earthquake, etc.

* operational/procedural security - who is authorised to do or responsible for doing what and when, who can authorise others to do what and who has to report what to who.

* personnel security - hiring employees, background screening, training, security briefings, monitoring and handling departures.

* System security - User access and authentication controls, assignment of privilege, maintaining file and filesystem integrity, backup, monitoring processes, log-keeping, and auditing.

* network security - protecting network and telecommunications equipment, protecting network servers and transmissions, combatting eavesdropping, controlling access from untrusted networks, firewalls, and intrusion detection.

Encryption is one important technique used to improve data security.

OWASP is the free and open application security community.


An umbrella term for the protection of electronic data and networks. In the IT world, security comprises authorization (who has access?), authentication (is this "really" the authorized user?), encryption (scrambling data for privacy), malware protection (avoiding destructive infiltration), as well as backup and disaster recovery (assurance against failure). See security suite, computer security, information security, security audit, security protocol, access control, authentication, cryptography, malware, backup and disaster recovery.
References in periodicals archive ?
The foreign ministry, judicial colonies, Dchowk and two hotels have also been included in the high security zones.
A regional Independent Election Commission ( IEC ) official, who wished not be named, said 15 polling sites were under high security threat in Nimroz, but authorities had promised to ensure security for them.
Reconnaissance International, organisers of the High Security Printing Conferences, is also managing the African Banknote Conference on behalf of the Association of African Banknotes and Security Documents Printers (AABSDP).
8220;Our High Security HP enclosure offers enhanced protection on every level and protects against every significant threat to a continuous power operation.
Berger opens with a review of the history of high security holograms and an overview of holo-gram producers.
There will also be a series of presentations on the design and production of currency, cost versus security in ID cards, worldwide trends in ID documents, a comparison of the high security printing markets in all three regions, and a session focused on R&D innovation.
By utilizing its own technologies, XTec is able to deliver a complete solution to both large and small agencies with its integrated AuthentX[TM] Credential Management and Access Control system, using the complete line of XTec IP addressable, high security smart card readers.
The next Asian High Security Printing Conference will be held in Beijing from October 13-15 with the support of China Banknote Printing and Minting Corporation.
The DSC501 Very High Security Barricade System not only survives a 15,000-pound vehicle traveling at 50 mph, but it also continues to operate after impact.
The company's solutions address the high security electronic transaction needs of banks and other financial institutions, large scale retailers, smaller merchants, quick service restaurants, and users in the transportation, healthcare, prepaid, unattended and many other markets.
The DSC720 High Security Bollard system is Delta's highest crash-rated bollard system.