Summary

Access controls are security features that are usually considered the first line of defense in asset

protection.

We say that a system is secure if its resources are used and accessed as intended under all

circumstances.

There are three main security principles for any type of security control: Availability, Integrity, and

Confidentiality.

Protection is a mechanism for controlling the access of programs, processes, or users to the resources

defined by the computer system. A collection of access rights to the resources is the protection domain.

There are two protection domains in the operating system: the user protection domain and the kernel

mode protection domain.

A threat is a possible danger that might exploit a vulnerability to breach security and thus cause possible

harm.

Program threats such as: trojan horse, trap door, and stack overflow.

System threats such as: worms and viruses.

Encryption is the conversion of data into a form, called cipher text that cannot be easily understood by

unauthorized people.

Summary

There is a variety of encryption software available for common operating systems.

Computer security is a branch of computer technology known as information security as applied to

computers and networks.

The term computer system security means the collective processes and mechanisms by which

information and services are protected.

An antivirus is a program that protects the computer from virus infections.

Firewall is a program or device that blocks unrequested communications from the Internet, preventing

the computer from responding to attempts to access.

There are two types of firewalls: software firewall, and hardware firewall.

A way to keep your computer secure is to use a password. Passwords are often used to protect objects

in the computer system.