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What Are Supercookies, and Why Are They Dangerous?


In March 2016, Verizon was hit with a $ 1.35 million fine for tracking customers with a unique identifier header (UIDH), also known as a “supercookie.” It was big news when Verizon was forced to make this tracking known and allow customers to opt out of it. But what is a supercookie? And why is it so much worse than a regular cookie? Here’s what you need to know. Cookies and Supercookies To understand supercookies, it’s important that you know what regular cookies are. An HTTP cookie, usually just known as a cookie, is a small piece of code that’s downloaded to…

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