All Your Most Pressing Heartbleed Questions Answered

A bug in OpenSSL encryption was said to affect about two-thirds of all the Internet's infrastructure. What does that mean, exactly?

"On the scale of 1 to 10, this is an 11," wrote security expert Bruce Schneier in a blog post this week. He was referring to Heartbleed, the devastating two-year-old bug that was only revealed Monday. It is quickly snowballing into the single biggest security vulnerability in Internet history. Here's what you need to know about it, what it's doing to companies, and what you can do to protect your data.

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