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Inf. Syst. Secur."],"published-print":{"date-parts":[[2011,11]]},"abstract":"<jats:p>\n            We ask the question: how can Web sites and data aggregators continually release updated statistics, and meanwhile preserve each individual user\u2019s privacy? Suppose we are given a stream of 0\u2019s and 1\u2019s. We propose a differentially private continual counter that outputs at every time step the approximate number of 1\u2019s seen thus far. Our counter construction has error that is only poly-log in the number of time steps. 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