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This lecture discusses the SwissCovid protocol for digital proximity tracing, which aims to notify users of potential exposure to COVID-19. It covers the goals, operation principles, and technical details of the protocol, including how phones exchange random identifiers, upload keys upon diagnosis, and notify users of exposure. The lecture also explores access control mechanisms such as DAC and MAC, explaining how permissions are assigned and managed in systems like Windows and Linux. Additionally, it delves into the concepts of ACLs, capabilities, and the least privilege principle in access control policies.
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