Security Medium 1 — Canvas Fingerprinting
Before we look at canvas finger printing, I just want to set the scene with a reminder of one of the most fundamental truths about how the web was designed – each web page load is an independent event. Because that meant websites had no memory of anything that went before, i.e. no concept of state the original web could not cope with concepts like logging in, or shopping baskets. Something had to be bolted on to allow web servers connect individual requests into related groups of requests.
The official mechanism added to the HTTP protocol for retaining state between requests is the humble cookie. Cookies gave us the ability to log in, and basically, the modern web. But, they came with a dark side — as well as enabling all the cool things we like about the modern web, they also enabled tracking.