malicious and spyware
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The most perfidious form but is ransomware . Kidnaps you the computer literally makes him hostage. It hinders or prevents the normal functioning, invites viruses from the net and makes demands on a “cleaning fee” or release fee, which is nothing more than a ransom: Only when you pay, you can work with the computer again. War 2006/2007 often, but has since declined.
risk number one: User
The biggest security risk in the world of computer sitting in front of the computer. Not only lack of discipline in necessary software updates do not make users dangerous: He also has a great taste for free music from obscure sources, funny file attachments in e-mails and a great communication pleasure in the oh-so-informal chat space of the web. Most damage in IT are likely to be caused by user-fingers on the mouse buttons.