With security on the Internet, there's always some nagging doubt. Can you ever be absolutely certain, for example, that the e-mail you're sending with some confidential business information attached isn't going to be intercepted and read as it travels the digital highways and byways?

Using the Internet for anything sensitive requires some faith that everything in place to ensure the security of the information you're working with—all the encryption, passwords, and security policies—will, in fact, work. But as with most things in life, nothing is certain except uncertainty itself.

At BusinessWeek.

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