Most mobile calls are protected with an encryption system that uses a huge number of keys to stop eavesdropping. The vast amount of time it would take to try all the keys just to get at the contents of one call makes it effectively impossible to eavesdrop.
Dr Nohl said he, his colleagues and a few dozen others have found a way to shrink the amount of storage needed to hold a complete list of the keys and speed up the way to find the one that unscrambles a conversation.
Without these innovations the call cracking project would have got nowhere, said Dr Nohl.
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