Without protection, trackers can identify which websites a browsing user is logged into and use the information as a fingerprint. Third-party cookies blocking by default would disable login fingerprinting, a problem already described 12 years ago. John Wilander, software engineer at Apple, mentioned in the blog a few advantages related to the default third-party cookies blocking. Safari 13.1 will now block all third-party cookies by default for all users. ITP additionally blocked some, but not all, third-party cookies by default on both desktop and mobile platforms. ITP reduced over the years the time limit on persistent client-side cookies to 24 hours from over a year. This is a significant improvement for privacy since it removes any sense of exceptions or “a little bit of cross-site tracking is allowed.”Īlongside the existing privacy features of Mozilla’s Firefox, which also blocks known third-party cookies by default since last year, Apple has continuously updated ITP and further restricted the conditions of usage of first-party and third-party cookies. Safari describes the changes as improving privacy for users:Ĭookies for cross-site resources are now blocked by default across the board. The move comes after gradually increasing cookie restrictions which started with the introduction of Safari’s Intelligent Tracking Prevention (ITP) in 2017 (now in version 2.3). Safari recently announced blocking cookies for cross-site resources by default. Third-party cookie blocking by default may disable login fingerprinting, and some cross-site request forgery attacks. Google, which announced moving in that direction in May 2019, will not support third-party cookie blocking by default for all Chrome users until 2022. Safari joins privacy-focused web browsers like Tor and Brave in blocking third-party cookies by default in a move aimed at taking a step forward in web privacy.
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