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The term cyber security denotes a number of activities, measures, and techniques developed to protect from attacks, service interruptions, and other threats to computers, computer networks, and information they contain and exchange, as well as software, data, and other elements of cyberspace. Therefore, this term refers to united efforts and attempts, which include research and analyses, with the aim of inventing new technologies and improving the existing activities related to the security of cyberspace and the level of its protection from cyber threats. Those activities can contain, for example, an estimate of reliability and vulnerability of the hardware and software used in critical infrastructures of a particular country. The concept of cyber security implies a holistic approach in research and confronting cyber threats to information systems—from standpoints of information and mathematic sciences and their special disciplines (like cryptography and cryptanalysis), and military, legal, crime, and criminology aspects.

Etymologically, roots of the term cyber security date back to the 1960s. At that time, communication security (COMSEC) was dealt with. When computers appeared, during the 1970s, computer security (COMPUSEC) came into being. In the 1980s, because of such threats as Cuckoo's Egg and Morris Worm, it was realized that a network consisting of a large number of computers could be used for malicious aims. That is when the integration of communication and computer security happened, so the term information security (INFOSEC) was coined. Information security has integrated disciplines that used to be separated, such as personnel security, computer security, communication security, and operational security. At that point, information security had already become one of the four cornerstones of U.S. national security (besides diplomacy, economy, and military components).

Definitions of Cyber Security

Today, there is no generally accepted definition of the term cyber security, but the terms information security and information assurance are part of a wider concept of cyber security.

The most widespread is the notion according to which cyber security is identified with information security, which refers to protection of information and information systems against being broken into, used, spread, or subjected to service interruptions, unauthorized changes, or destruction, with the aim of guaranteeing their confidentiality, integrity, and availability. The emphasis in information security is put on preventing unauthorized access to information systems. From this standpoint, confidentiality of information is the main consideration.

According to another, newer, approach, the term cyber security is identified with the term information assurance (IA). IA is defined by the National Security Agency of the United States as a number of measures for protecting and defending information and information systems by means of securing and assuring their availability, integrity, authentication, privacy, and nonrepudiation. It includes measures for backing up a system, its protection, detection that the system is being hacked, and reaction to attacks. Assurance represents the level of confidence that is proportional to the efficiency of additional measures of security. The introduction of this term, in a way, testifies to the change of the granite concept of security, typical for traditional information systems that were not connected to a network, toward a more flexible concept of security that on one hand, implies that the nature of cyberspace is against reaching absolute security and, on the other hand, is measured by the value of information and devices that have to be protected.

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