In March, unknown intruders broke into the computer systems of database giant LexisNexis, gaining access to the Social Security numbers and personal data of hundreds of thousands of people.

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What would happen if the security services demanded access to such a database?

ECONOMIST: The measure of man | The

Florida Gov. Rick Scott, a Republican, told Fox News Monday that the state plans to sue the Department of Homeland Security to get access to the federal citizenship database so that it can better determine who is voting legally.

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The programme, called I-Checkit, is intended to allow security checks to start as soon as a potential flyer books a ticket by extending access to the database to airlines, hotels and banks.

BBC: How safe is your passport?