Threats in a Computerized Environment

• Virus  
• inserts itself into another program to propagate; 
• cannot run independently
• Worm 
• propagates itself over a network; 
• run independently; 
• cannot attach to other programs
• Trojan Horse 
• appears to be useful but has a hidden, unintended function that presents security risk; 
• cannot replicate itself
• Denial-of-Service Attack 
• bombards another computer with a flood of information to keep users from accessing the computer/network
• Phishing
• phony e-mails