...do business over the Internet with reputable firms. However, this may not be as easy as it sounds. Recently, a phony Web site posing as Best Buy was exposed as a scam. So here's what it boils down to. Do not reveal your credit card numbers...

...passwords can be stolen in a "man-in-the-middle" attack, in which a con artist harvests a victim's code on a phony Web site and instantly relays it to the real bank, then conducts transactions in her name. Such frauds are rare - if they...

...you fall victim to a "phishing" scheme (an e-mail that entices you to enter personal information in a form on a phony Web site that looks like your bank's or credit-card company's), it doesn't matter what brand of computer you use...