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Security
Security is the condition of being protected against danger or loss. In the general sense, security is a concept similar to safety. The nuance between the two is an added emphasis on being protected from dangers that originate from outside. more...
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Individuals or actions that encroach upon the condition of protection are responsible for the breach of security.
Definition of security
A simple and clear definition of effective security could be:
a secure system is a system which does exactly what we want it to do and nothing that we don't want it to do even when someone else tries to make it behave differently.;
Another proposed definition:
When our expectations are met, we can say that quality has been met. When our expectations are met once and again, despite errors, catastrophes and attacks which in principle could prevent our expectations to be met, we can say that security has been met. Security is not falsifiable (Popper). We can prove that there has been a security failure, but we can't prove that there hasn't. Security measures improve the likeliness of expectations to be met, and therefore improve security. With respect to classified matter there is an expectation of the classified matter to remain secret for as long as we wish. A control access system is the security measure that helps this expectation to be accomplished.;
The word "security" in general usage is synonymous with "safety," but as a technical term "security" means that something not only is secure but that it has been secured. In telecommunications, the term security has the following meanings:
A condition that results from the establishment and maintenance of protective measures that ensure a state of inviolability from hostile acts or influences.;
With respect to classified matter, the condition that prevents unauthorized persons from having access to official information that is safeguarded in the interests of national security.;
Measures taken by a military unit, an activity or installation to protect itself against all acts designed to, or which may, impair its effectiveness.;
Sources: from Federal Standard 1037C and adapted from the Department of Defense Dictionary of Military and Associated Terms
Security has to be compared and contrasted with other related concepts: Safety, continuity, reliability. The key difference between security and reliability is that security must take into account the actions of active malicious agents attempting to cause destruction.
Perceived security compared to real security
It is very often true that people's perception of security is not directly related to actual security. For example, a fear of flying is much more common than a fear of driving; however, driving is generally a much more dangerous form of transport.
Read more at Wikipedia.org
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