What is Computer Security?

Computer security is the protection of assets from unauthorized access, use, alteration, or destruction.

Computer security is generally classified into three categories:-

  1. Secrecy \ confidentiality
  2. Integrity
  3. Necessity


  1. Secrecy \ confidentiality

Secrecy refers to protecting against unauthorized data disclosure and ensuring the authenticity of the data’s source.

The main objective of computer security is to stop unauthorized users from reading sensitive data. More generally, an unauthorized user should not learn sensitive information. Confidentiality captures this aspect of computer security.

Thus, a secure computer system must not allow information to be disclosed to anyone who is not authorized to access it. Secrecy is of paramount importance in protecting national defense information and highly proprietary business information.

  1. Integrity:-

Integrity refers to preventing unauthorized data modification.

A secure computer system must maintain the continuing integrity of the information stored in it. Integrity or accuracy means that the system must not corrupt the information or allow any unauthorized malicious or accidental changes to it.

  1. Necessity:-

Necessity refers to preventing data delays or denials.

The information that is being stored or transmitted across communication network should be available whenever required and to whatever extent as desired within pre-established time constraints.


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