If you want to secure the data on your computer, one of the most important steps you can take is encrypting its hard drive. That way, if your laptop gets lost or stolen—or someone can get to it when you're not around—everything remains protected and inaccessible. But researchers at the security firm F-Secure have uncovered an attack that uses a decade-old technique, which defenders thought they had stymied, to expose those encryption keys, allowing a hacker to decrypt your data.
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