Computer security

Computer security is a branch of technology known as information security as applied to computers and networks.

The objective of computer security includes protection of information and property from theft, corruption, or natural disaster, while allowing the information and property to remain accessible and productive to its intended users.

The terms computer system security, means the collective processes and mechanisms by which sensitive and valuable information and services are protected from publication, tampering or collapse by unauthorised activities or untrustworthy individuals and unplanned events respectively.

The technologies of computer security are based on logic. As security is not necessarily the primary goal of most computer applications, designing a program with security in mind often imposes restrictions on that program's behavior.

There are several approaches to security in computing:

1. Trust all the software to abide by a security policy but the software is not trustworthy .

2. Trust all the software to abide by a security policy and the software is validated as trustworthy .

3. Trust no software but enforce a security policy with mechanisms that are not trustworthy .

4. Trust no software but enforce a security policy with trustworthy mechanisms.