In response to Olejnik's Chromium bug report, Google senior software engineer Josh Karlin disputes Olejnik's characterization of the issue. "This information leak works because when browsing in Incognito a call to document.interestCohort() results in an exception," explains Olejnik.Īs he points out, Google acknowledges as much in its FLoC Security and Privacy Self-Review, stating making a FLoC identifier request while in Incognito mode would throw an error, just like the API is supposed to do when an individual's cohort is not eligible to be calculated or blocked, which can happen currently if the browser is set to block third-party cookies. jazz fans) without exposing individual identities or website visits.īut FLoC, scheduled for broader testing in Chrome 90 next month, isn't yet watertight. Thousands of people will share the same cohort ID, which might be something like "498413426628." The general idea is that FLoC will identify interest groups (e.g. The cohort ID is derived from the user's interests as expressed in their web browsing history. The identifier, Olejnik, explains, is obtained by generating a SimHashed fingerprint which provides a way to evaluate set similarity. When FLoC is widely implemented, web sites will be able to request a visitor's interest cohort, which will be returned in the form of an identifier. One of these, FLoC, provides a way to present Chrome users with online ads targeted at their general interests. Google has said it plans to phase out third-party cookies in 2022 and implement a set of still-incomplete technologies, some from ad tech partners, that constitute what the Chocolate Factory calls its Privacy Sandbox.
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