By comparison, it takes my 2010 iPad 25 seconds to cold boot, and my iPhone 4 an even longer 35 seconds to boot.

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While the "cold boot" attack had been tried on desktop PCs and laptops, Mr Muller said the trio were the first to try it on phones.

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The Little Devil chassis used for the purpose of this demo has an LED screen displaying the -40-degree operating temperature, but you won't need it: the system automatically shuts down if it gets too cold, and it won't boot into Windows until Phase Change is up and running.

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Cold, cloudy and raw, with a biting wind to boot.

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