Why are information systems vulnerable to destruction, error, and abuse?

Why are information systems vulnerable to destruction, error, and abuse?
•           List and describe the most common threats against contemporary information systems.
•           Define malware and distinguish among a virus, a worm, and a Trojan horse.
•           Define a hacker and explain how hackers create security problems and damage systems.
•           Define computer crime. Provide two examples of crime in which computers are targets and two examples in which computers are used as instruments of crime.
•           Define identity theft and phishing and explain why identity theft is such a big problem today.
•           Describe the security and system reliability problems created by employees.

•           Explain how software defects affect system reliability and security.

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