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Note that Security should not be confused with Safety. In some languages (e.g. German, Spanish, Swedish ...) both meanings are represented by the same word. In Hebrew security is a name of action ( אבטחה , avtacha ) which should lead to safety ( ביטחון , bitachon ); Both words are derived from the same root bet- tet- heth ב-ט-ח .

1 Finance

In finance, a security is an instrument traded in the financial markets. See Securities.

2 Private security

In private security, security is the result of services provided to prevent, deter, detect and/or document crime, fire, disorder or violations of company rules. These services may be provided by a security guard or by alarms, security cameras, or as a routine part of the performance of every employee's duties (especially in smaller companies).

Compare with: National security, PoliceFor the band, see The Police. For the Polish town, see Police, Poland. Police forces are government organisations ostensibly charged with the responsibility of maintaining law and order. The word comes from the French, and less directly from the Greek pol

3 Telecommunications

In telecommunicationTelecommunication is the extension of communication over a distance. In practice it also recognizes that something may be lost in the process; hence the term 'telecommunication' covers all forms of distance and/or conversion of the original communications, the term security has the following meanings:

• A condition that results from the establishment and maintenanceRepair and Maintenance is fixing any sort of mechanical or electrical device should it get out of order or broken (repair) as well as performing the routine actions which keep the device in working order (maintenance) or prevent trouble from arising (prev 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 accessThis is a list of articles related to the notion of access information transfer, computer storage, telecommunication and computer networks: ACCESS. bus access charge access method access time broadband Internet access broadband wireless access code divisi to official informationInformation is a term with many meanings depending on context, but is as a rule closely related to such concepts as meaning, knowledge, instruction, communication, representation, and mental stimulus. Although many people speak of the advent of the "infor 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 1037CFederal Standard 1037C entitled Telecommunications: Glossary of Telecommunication Terms is a U. Federal Standard, issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended. This docu and adapted from the Department of Defense Dictionary of Military and Associated TermsThe Department of Defense Dictionary of Military and Associated Terms is a compedium of terminology used by the United States Department of Defense (DOD). External links See also: METT-TC. and from the Department of Defense Dictionary of Military and Associated TermsThe Department of Defense Dictionary of Military and Associated Terms is a compedium of terminology used by the United States Department of Defense (DOD). External links See also: METT-TC.

Another proposed alternative definition:

• When our expectations are met, we can say that quality has been met. When our expectations are met once and again, despite of 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 falsable (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.

See also: classified information, insecurity, information security, computer security, hacking, cracking, phreaking, CISSP, search, ilities.