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In the DP - 3 T protocol for proximity tracing against Covid 1 9 , each client device Y compares her stored EphIDs with the
In the DPT protocol for proximity tracing against Covid each client device Y compares her stored EphIDs with the EphIDs in each new infection report published by the server.
a If the number of infection reports published per day is constant, and assuming the number of EphIDs stored by client devices grows linearly with the number d of elapsed days, how does the number of comparisons carried out by Y grow with d
b Regarding privacy, what do the server and the user holding Y learn on the places visited by an infected user X or on the people X approached?
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