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In PUBA, users keep an unlinkable but authenticated cryptographic logbook containing their historic data on their device. This logbook can only be updated by the operator while its content is not revealed. Users can take part in a privacy-preserving analytics computation, where it is ensured that their logbook is up-to-date and authentic while the potentially secret analytics function is verified to be privacy-friendly. Taking constrained devices into account, users may also outsource analytic computations (to a potentially malicious proxy not colluding with the operator).We model our novel building block in the Universal Composability framework and provide a practical protocol instantiation. To demonstrate the flexibility of PUBA, we sketch instantiations of privacy-preserving fraud detection and targeted advertising, although it could be used in many more scenarios, e.g. data analytics for multi-modal transportation systems. We implemented our bookkeeping protocols and an exemplary outsourced analytics computation based on logistic regression using the MP-SPDZ MPC framework. Performance evaluations using a smartphone as user device and more powerful hardware for operator and proxy suggest that PUBA for smaller logbooks can indeed be practical.<\/jats:p>","DOI":"10.2478\/popets-2022-0054","type":"journal-article","created":{"date-parts":[[2022,3,5]],"date-time":"2022-03-05T04:34:02Z","timestamp":1646454842000},"page":"447-516","source":"Crossref","is-referenced-by-count":2,"title":["PUBA: Privacy-Preserving User-Data Bookkeeping and Analytics"],"prefix":"10.56553","volume":"2022","author":[{"given":"Valerie","family":"Fetzer","sequence":"first","affiliation":[{"name":"Karlsruhe Institute of Technology , KASTEL"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marcel","family":"Keller","sequence":"additional","affiliation":[{"name":"CSIRO\u2019s Data61"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sven","family":"Maier","sequence":"additional","affiliation":[{"name":"Karlsruhe Institute of Technology , KASTEL"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Markus","family":"Raiber","sequence":"additional","affiliation":[{"name":"Karlsruhe Institute of Technology , KASTEL"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andy","family":"Rupp","sequence":"additional","affiliation":[{"name":"University of Luxembourg and KASTEL SRL"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rebecca","family":"Schwerdt","sequence":"additional","affiliation":[{"name":"Karlsruhe Institute of Technology , KASTEL"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"35752","published-online":{"date-parts":[[2022,3,3]]},"reference":[{"key":"2022060209291974941_j_popets-2022-0054_ref_001","doi-asserted-by":"crossref","unstructured":"[1] M. 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