Varied computer systems require different levels of computer security, as the level of privacy or protection needed is going to vary significantly. Computer systems under government control, for example, require a much higher level of security than computers used by students in a university setting. The level of required computer security, then, along with what forms of security are implemented, are going to vary significantly as well.

Firewall softwares are an example of security meant to protect computers from threats that travel via the internet or peer to peer connections and ensures internet privacy too. Chain of trust techniques are techniques that are used to ensure that all software on a computer is certified as authentic directly from the designers of the system. Access control is used to ensure the separation of privileges, ensuring that only specified people have the right capabilities on a computer system. This way you can have specific softwares for email security and internet privacy. Also find free automatic updates, real-time protection detecting and isolating viruses as files are opened and programs are run; a "virus vault" which holds the virus and keeps it from entering your computer until you can decide what to do with it. Such software is intuitive and easy to use. It works in the background protecting your computer from anti-virus threats allowing you to still work efficiently on your computer.

Computer Security involves three Layers:

• Cracking
• Phreaking
• Hacking

Cracking