My latest Guardian column "Surveillance: You can know too much," explains how collecting too much information on innocent people makes it harder to catch guilty ones:
At a certain point, data gathered to predict the weather overwhelms your capacity to add it to your calculations efficiently, resulting in ever-longer runtimes that give less accurate predictions. It's better to crunch the data needed to calculate tomorrow's weather in 10 minutes (and refine your guess twice an hour) than to shovel so much data into the hopper that you don't get tomorrow's forecast until next week.
The sweet spot lies somewhere between gathering too much information and gathering too little – and the secret to hitting that spot is intelligent, discriminating data-acquisition.
Take London: cover every square inch of the city with CCTVs and you'll get so much information that you'll never make any sense of it. Scotland Yard says that CCTVs help solve fewer than 3% of all crimes, while a study in San Francisco found that at best, criminals simply move out of camera range, while at worst they assume no one is watching.
Similarly, if you take fingerprints from every person who applies for a visa – or worse still, from every person in Britain who has to carry one of the proposed new biometric cards – you will fill the databases with chaff that slows down searches, generates endless false matches, and threatens everyone in the database with the worst kind of identity theft.
In the wake of the Paris attacks, the French National Assembly has declared a state of emergency with sweeping powers, without any substantial debate. Included in the bill are the power to order the nation’s ISPs to block websites without any judicial review or court order, and for authorities to seize and search electronic devices […]
The $825,000 Z Backscatter Vans the NYPD drives around the city look like regular police vans, but are equipped with powerful X-rays that can see through walls and vehicles. US Customs uses these things to scan cars and freight-containers, but only after they’re sure there are no people around.
“The End of the Internet Dream,” cyberlawyer Jennifer Granick’s keynote at Black Hat, was all anyone could talk about at this year’s Defcon — Black Hat being the grown-up, buttoned-down, military-industrial cousin to Defcon’s wild and exuberant anarchy.
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