The term computer security is used frequently, but the content of a computer is vulnerable to few risks unless the computer is connected to other computers on a network. Today we can find mostly positive as well as some negative impact of computers on society. Computers are increasingly being used in sensitive areas like civil aviation, banking, insurances, public transportation, national defense and in similar sensitive areas. computers are used to provide better service in sectors like banking or airline, reservation for insurance, or a higher quality product like automobile parts. They are used to provide decision makers, also called expert systems with accurate, up-to-date information, so that better business decisions can be made. The main aim of computer security includes protection of information and property from theft, corruption, or natural disaster, and also allowing the information and property to remain accessible and productive to its intended users.
Information can be stolen, modified, corrupted and even used as a weapon to deny access to information stored on other computer systems or networks.IT Security, as a concept, is often synonymous with Computer Security. Computer security is frequently associated with three core areas, which can be conveniently summarized by the acronym "CIA":
* Confidentiality -- Ensuring that information is not accessed by unauthorized persons
* Integrity -- Ensuring that information is not altered by unauthorized persons in a way that is not detectable by authorized users
* Authentication -- Ensuring that users are the persons they claim to be