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What’s worse than a cookie? A ‘perma-cookie’

What’s worse than a cookie? A ‘perma-cookie’:

Last fall, Verizon in the U.S. was found to be using the headers to cash in on the mobile advertising market and deliver targeted ads to customers.

It was later revealed that other advertisers, unaffiliated with Verizon’s own advertising program, were taking advantage of the headers to then track and target cellphone users for ads, even if customers had opted out.

Privacy experts also worry about the potential for governments and criminals to hijack the data.

Christopher Parsons, the managing director of a telecom transparency project run out of the Citizen Lab at the University of Toronto, says that national security services and agencies “already track Canadians, Americans and citizens of other nations using unencrypted identifying information and there’s no reason to believe they wouldn’t use perma-cookies for similar tracking purposes.”

 

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How advertising cookies let observers follow you across the web

Source: How advertising cookies let observers follow you across the web