Verizon’s ‘Perma-Cookie’ Is a Privacy-Killing Machine

Injecting a unique identifier on to your websites:

The company—one the country’s largest wireless carriers, providing cell phone service for about 123 million subscribers—calls this a Unique Identifier Header, or UIDH. It’s a kind of short-term serial number that advertisers can use to identify you on the web, and it’s the lynchpin of the company’s internet advertising program. But critics say that it’s also a reckless misuse of Verizon’s power as an internet service provider—something that could be used as a trump card to obviate established privacy tools such as private browsing sessions or “do not track” features.

via Verizon’s ‘Perma-Cookie’ Is a Privacy-Killing Machine | WIRED.