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Memory trick breaks PC encryption

Encrypted information held on a laptop is more vulnerable than previously thought, US research has shown.

Scientists have shown that it is possible to recover the key that unscrambles data from a PC's memory.

It was previously thought that data held in so-called "volatile memory" was only retained for a few seconds after the machine was switched off.

But the team found that data including encryption keys could be held and retrieved for up to several minutes.

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