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Due to the difference of body shapes and motion patterns, each person can have specific influence patterns on surrounding WIFI signals while she moves indoors, generating a unique pattern on the CSI time series of the WIFI device," the team writes in its report. "FreeSense…is nonintrusive and privacy-preserving compared with existing methods [of human identification].

"This discussion paper explores the rapidly evolving landscape of how we behave and interact online, and how businesses respond. The internet has transformed how we live, work and relate to one another. We can make 'friends' around the world without ever saying 'hello', compare products from dozens of shops without leaving the house, or plan a date with a stranger without breaking a sweat. Overall it has proven a powerful force for good; delivering significant benefits to the economy and to consumers in the form of greater choice, personalisation, and incredible convenience."