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Information security, sometimes shortened to Info Sec, is the practice of preventing unauthorized access, use, disclosure, disruption, modification, inspection, recording or destruction of information.
A computer is any device with a processor and some memory.
It offers many areas for specialization, including securing networks and allied infrastructure, securing applications and databases, security testing, information systems auditing, business continuity planning, electronic record discovery, and digital forensics.
Possible responses to a security threat or risk are: Since the early days of communication, diplomats and military commanders understood that it was necessary to provide some mechanism to protect the confidentiality of correspondence and to have some means of detecting tampering.
Such devices can range from non-networked standalone devices as simple as calculators, to networked mobile computing devices such as smartphones and tablet computers.
IT security specialists are almost always found in any major enterprise/establishment due to the nature and value of the data within larger businesses.