![]() This is a very simplistic version of cache timing attacks that take place regularly-more sophisticated attacks may focus on elements that strongly imply a user is currently logged in to an unrelated site, rather than simply having visited it recently. Since there's no copy of the file in shadywebsite's site-specific cache pool, logo.jpg must be loaded directly-whether it's in coolwebsite's cache pool or not. When using a partitioned cache, the copy of that was downloaded and cached when the user visited coolwebsite isn't available when the user visits shadywebsite. shadywebsite now knows that the user has recently visited -because if logo.jpg hadn't been cached, it would have taken longer to render in-browser.Since was in cache, it renders in under five milliseconds.shadywebsite uses JavaScript elements to time how long the user's browser needs to render logo.jpg. ![]()
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