Boiled Frog from a Nation of Suspects writes "The Oyster card, an RFID single-swipe card (which was latterly cracked), was introduced to London's public transport users purportedly to make their lives easier. Now, British Intelligence government-provided services want some of the allowances by drifting through the travel data amassed by the card to spy on the 17 million Britons who use it. The article notes, "Currently the security casework can demand the Oyster records of specific individuals under study to establish where they have been, but cannot trawl the whole database. But supporters of calls for more sharing of data argue that apparently trivial snippets — like the journeys an individual makes around the capital — could become important pieces of the jigsaw when fitted into a pattern of other publicly held tip on an individual's movements, habits, education and other personal details. That could lead, they argue, to the unmasking of or then undetected suspects."

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