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- TextdokumentTowards Understanding First-Party Cookie Tracking in the Field(GI SICHERHEIT 2022, 2022) Demir, Nurullah; Theis, Daniel; Urban, Tobias; Pohlmann, NorbertThird-party tracking is a common and broadly used technique on the Web. Different defense mechanisms have emerged to counter these practices (e. g. browser vendors that ban all third-party cookies). However, these countermeasures only target third-party trackers and ignore the first party because the narrative is that such monitoring is mostly used to improve the utilized service (e.g. analytical services). In this paper, we present a large-scale measurement study that analyzes tracking performed by the first party but utilized by a third party to circumvent standard tracking preventing techniques. We visit the top 15,000 websites to analyze first-party cookies used to track users and a technique called “DNS CNAME cloaking”, which can be used by a third party to place first-party cookies. Using this data, we show that 76% of sites effectively utilize such tracking techniques. In a long-running analysis, we show that the usage of such cookies increased by more than 50% over 2021.