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To solve with this issue, a hybrid outsourcing model that exploits both cloud server and edge devices to store data is needed. Meanwhile, the requirements of security and efficiency are different under specific scenarios. There is a lack of a comprehensive solution that considers all of the above issues. In this work, we overcome the above issues by proposing the first hybrid user-centric data outsourcing (HUCDO) scheme. It allows users to outsource data securely, efficiently, and economically via different CPSs. Brielly, our contributions consist of theories, implementations, and evaluations. Our theories include the first homomorphic collision-resistant chameleon hash (HCCH) and homomorphic designated-receiver signcryption (HDRS). As implementations, we instantiate how to use our proposals to outsource small- or large-scale data through distinct CPS, respectively. Additionally, a blockchain with proof-of-discrete-logarithm (B-PoDL) is instantiated to help improve our performance. Last, as demonstrated by our evaluations, our proposals are secure, efficient, and economic for users to implement while outsourcing their data via CPSs.<\/jats:p>","DOI":"10.1145\/3379464","type":"journal-article","created":{"date-parts":[[2020,5,25]],"date-time":"2020-05-25T21:26:46Z","timestamp":1590442006000},"page":"1-23","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":5,"title":["HUCDO"],"prefix":"10.1145","volume":"4","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5102-610X","authenticated-orcid":false,"given":"Ke","family":"Huang","sequence":"first","affiliation":[{"name":"University of Electronic Science and Technology of China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaosong","family":"Zhang","sequence":"additional","affiliation":[{"name":"University of Electronic Science and Technology of China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaofen","family":"Wang","sequence":"additional","affiliation":[{"name":"University of Electronic Science and Technology of China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yi","family":"Mu","sequence":"additional","affiliation":[{"name":"Fujian Normal University"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fatemeh","family":"Rezaeibagha","sequence":"additional","affiliation":[{"name":"Murdoch University"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guangquan","family":"Xu","sequence":"additional","affiliation":[{"name":"Tianjin University"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hao","family":"Wang","sequence":"additional","affiliation":[{"name":"Norwegian University of Science and Technology"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xi","family":"Zheng","sequence":"additional","affiliation":[{"name":"Maquarie University"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guomin","family":"Yang","sequence":"additional","affiliation":[{"name":"University of Wollongong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qi","family":"Xia","sequence":"additional","affiliation":[{"name":"University of Electronic Science and Technology of China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaojiang","family":"Du","sequence":"additional","affiliation":[{"name":"Temple University"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2020,5,22]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1109\/ISORC.2008.25"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.mfglet.2014.12.001"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.comnet.2010.05.010"},{"volume-title":"Cloud Infrastructures, Services, and IoT Systems for Smart Cities","author":"Puthal Deepak","key":"e_1_2_1_4_1","unstructured":"Deepak Puthal , Rajiv Ranjan , Surya Nepal , and Jinjun Chen . 2017. 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