{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,16]],"date-time":"2026-05-16T14:01:31Z","timestamp":1778940091211,"version":"3.51.4"},"reference-count":37,"publisher":"Oxford University Press (OUP)","issue":"8","license":[{"start":{"date-parts":[[2021,5,15]],"date-time":"2021-05-15T00:00:00Z","timestamp":1621036800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["62072051"],"award-info":[{"award-number":["62072051"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Key Project Plan of Blockchain in Ministry of Education of the People's Republic of China","award":["2020KJ010802"],"award-info":[{"award-number":["2020KJ010802"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2022,8,11]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>The ability of Fog computing to admit and process huge volumes of heterogeneous data is the catalyst for the fast expansion of Internet of things (IoT). The critical challenge is secure and differentiated access to the data, given limited computation capability and trustworthiness in typical IoT devices and Fog servers, respectively. This paper designs and develops a new approach for secure, efficient and differentiated data access. Secret sharing is decoupled to allow the Fog servers to assist the IoT devices with attribute-based encryption of data while preventing the Fog servers from tampering with the data and the access structure. The proposed encryption supports direct revocation and can be decoupled among multiple Fog servers for acceleration. Based on the decisional $q$-parallel bilinear Diffie\u2013Hellman exponent assumption, we propose a new extended $q$-parallel bilinear Diffie\u2013Hellman exponent (E$q$-PBDHE) assumption and prove that the proposed approach provides \u2018indistinguishably chosen-plaintext attacks secure\u2019 data access for legitimate data subscribers. As numerically and experimentally verified, the proposed approach is able to reduce the encryption time by 20% at the IoT devices and by 50% at the Fog network using parallel computing as compared to the state of the art .<\/jats:p>","DOI":"10.1093\/comjnl\/bxab031","type":"journal-article","created":{"date-parts":[[2021,5,7]],"date-time":"2021-05-07T11:38:08Z","timestamp":1620387488000},"page":"1948-1963","source":"Crossref","is-referenced-by-count":1,"title":["Secure and Differentiated Fog-Assisted Data Access for Internet of Things"],"prefix":"10.1093","volume":"65","author":[{"given":"Ping","family":"Yu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Switching and Networking Technology , Beijing University of Posts and Telecommunications, Beijing 100876, China"},{"name":"Global Big Data Technologies Centre , University of Technology Sydney 2007, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wei","family":"Ni","sequence":"additional","affiliation":[{"name":"Data61 , CSIRO, Sydney 2122, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hua","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Switching and Networking Technology , Beijing University of Posts and Telecommunications, Beijing 100876, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ren","family":"Ping Liu","sequence":"additional","affiliation":[{"name":"Global Big Data Technologies Centre , University of Technology Sydney 2007, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qiaoyan","family":"Wen","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Switching and Networking Technology , Beijing University of Posts and Telecommunications, Beijing 100876, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenmin","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Switching and Networking Technology , Beijing University of Posts and Telecommunications, Beijing 100876, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fei","family":"Gao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Switching and Networking Technology , Beijing University of Posts and Telecommunications, Beijing 100876, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2021,5,15]]},"reference":[{"key":"2022081612371010400_ref1","first-page":"291","article-title":"A survey on Internet of Things architectures","volume":"30","author":"Ray","year":"2016","journal-title":"J. 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