At least nine telcos around the world are using so-called super-cookies to secretly monitor citizens’ online behavior, according to a new study.
A super-cookie is a token unique to each subscriber that is injected into every HTTP request made through a telco’s cellphone networks. They can’t be stripped by the user: every time a subscriber visits a website from his or her smartphone, the telco’s system places the super-cookie in the HTTP headers, so that the site’s servers can identify the visitor.
This super-cookie allows ad networks and media publishers to follow people across the internet even if they clear their cookies. It allows the networks to build up profiles on users’ habits, and pitch them targeted advertising, while the telcos take a cut.
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Source Credits: The Register