4Complete these sentences with the words in the box. You do not need all the words. adware biometric scanning browser hijacker encryption
firewall hacker malware attack spyware Trojan

19A(n) is someone who tries to break into a computer system.
20A program which is usually free but contains a virus is called a(n)
21An effort to get unauthorised access to a computer is called a(n) .
22A(n) is software that replaces the user’s search engine with its own.
23 blocks authorised access.
24Software that sends information about the use of a computer system is called .
25 is one way to make sure that only authorised people access the network.
26 is software that automatically plays commercials on a computer.

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