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Researchers with Princeton University and the Electronic Frontier Foundation have found a flaw that renders disk encryption systems useless if an intruder has physical access to your computer — say in the case of a stolen laptop or when a computer is left unattended on a desktop in sleep mode or while displaying a password prompt screen.
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“Unlike many security problems, this isn’t a minor flaw; it is a fundamental limitation in the way these systems were designed.” The researchers successfully performed the attack on several disk encryption systems — Apple’s FileVault, Microsoft’s BitLocker, as well as TrueCrypt and dm-crypt — but said they have no reason to believe it won’t work on other disk encryption systems as well