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Potentially damage program that infect a computer, and alter files or the way it works, without the user's knowledge or permission virus Attack that disrupts a computer's asscess to an internet service (DOS) Denial of Service Conver plain text to ciphered text to enforce security or confidentiality. encryption Identity verification using physical characteristics Biometrics Looks legitimate, but contain malicious code Trojan horse hardware or software to keep hackers and malcious programs from entering a network firewall An attack where a hacker control a large number of "Zombie" computers against a victim server computer. distributed DOS It is easier to hack a___network a than a wired network wireless network Which is not malicious software: spyware, cookie, virus, worm. cookie