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Physical barriers

• physical barriers is a s

T ypes of threats

• opportunist threats. People who find an unattended computer which has been
• left logged in to a system may view, steal or damage information, programs or even
• hardware.
• computer viruses. These are small programs which can replicate themselves andspread from computer to computer. They are never benefit coal; usually they will make
• some changes to the system they infect and, even if they do no real damage, they
• are undesirable. They arrive by attaching themselves to files or email messages.
• other malware. Examples of malware include: computer worms (essentially a
• computer virus which does not need to attach itself to a file or message); Trojan
• horses, which appear as some benign program allowing a hacker full access to a
• system; spyware; ad-ware; and various other nasties. Malware is never benefice coal.
• Fishing. This is a type of threat which attempts to gain access to passwords,
• financial details and other such privileged information. Often this is done by email
• messages pretending to come from trusted websites, instant messaging or social
• networks. Normally they try to divert you to a website which looks original and which
• asks for information about you.