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Losing a laptop computer is one of the hazards of the mobile age. But laptops and the data they contain do not have to be lost for snoopers to get hold of their secrets.
Walk away from an operating laptop for a few moments, and interlopers can help themselves, even if the computer has a cryptographic file system to keep sensitive information secure. That is because once the owner has supplied the initial decryption key, typically when logging in, anyone using the laptop has access to data stored on the disk.
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