What is the difference between a black hat hacker and a cracker? What is the difference between a virus, worm, a Trojan horse, and a blended threat?  What is the CAN-SPAM Act? What is CAPTCHA? Explain...

What is the difference between a black hat hacker and a cracker? What is the difference between a virus, worm, a Trojan horse, and a blended threat?  What is the CAN-SPAM Act? What is CAPTCHA? Explain how a distributed denial-of-service attack works. Is a root kit a blended threat? Explain. What is the difference between phishing, smashing, and vishing? . What is the role of the US-CERT organization?