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Veugen, P.J.M. (author), Doumen, Jeroen (author), Erkin, Z. (author), Pellegrino, G. (author), Verwer, S.E. (author), Weber, J.H. (author)We consider dynamic group services, where outputs based on small samples of privacy-sensitive user inputs are repetitively computed. The leakage of user input data is analysed, caused by producing multiple outputs, resulting from inputs of frequently changing sets of users. A cryptographic technique, known as random user selection, is...journal article 2017