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While the analysis of the generated datastream can have many benefits from a health point of view, it can also lead to privacy threats by exposing highly sensitive information. In this article, we propose a framework that relies on machine learning to efficiently recognise the user activity, useful for personal healthcare monitoring, while limiting the risk of users re-identification from biometric patterns characterizing each individual. To achieve that, we show that features in temporal domain are useful to discriminate user activity while features in frequency domain lead to distinguish the user identity. We then design a novel protection mechanism processing the raw signal on the user\u2019s smartphone to select relevant features for activity recognition and normalise features sensitive to re-identification. These unlinkable features are then transferred to the application server. We extensively evaluate our framework with reference datasets: Results show an accurate activity recognition (87%) while limiting the re-identification rate (33%). This represents a slight decrease of utility (9%) against a large privacy improvement (53%) compared to state-of-the-art baselines.<\/jats:p>","DOI":"10.1145\/3416947","type":"journal-article","created":{"date-parts":[[2020,12,31]],"date-time":"2020-12-31T05:06:56Z","timestamp":1609391216000},"page":"1-22","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":14,"title":["Privacy-preserving IoT Framework for Activity Recognition in Personal Healthcare Monitoring"],"prefix":"10.1145","volume":"2","author":[{"given":"Theo","family":"Jourdan","sequence":"first","affiliation":[{"name":"Universit\u00e9 de Lyon, INSA Lyon, Inria, CITI, CNRS, Inserm, CREATIS UMR 5220, U1206, F-69621, Villeurbanne, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Antoine","family":"Boutet","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Lyon, INSA Lyon, Inria, CITI, F-69621 Villeurbanne, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Amine","family":"Bahi","sequence":"additional","affiliation":[{"name":"Universit Mohammed 6 polytechnique, Ben Guerir, Maroc"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carole","family":"Frindel","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Lyon, INSA Lyon, CNRS, Inserm, CREATIS UMR 5220, U1206, F-69621 Villeurbanne, France"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2020,12,30]]},"reference":[{"key":"e_1_2_1_1_1","unstructured":"[n.d.]. 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