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The existing revocable ABE schemes have the drawbacks of heavy computational costs on key updates and encryption operations, which make the entities for performing these operations a possible bottleneck in practice applications. In this paper, we propose an efficient Ciphertext-Policy Attribute-Based Online\/Offline Encryption with user Revocation (R-CP-ABOOE). We integrate the subset difference method with ciphertext-policy ABE to significantly improve key-update efficiency on the side of the trusted party from <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M1\"><mml:mi mathvariant=\"normal\">O<\/mml:mi><mml:mo stretchy=\"false\">(<\/mml:mo><mml:mi>r<\/mml:mi><mml:mrow><mml:mrow><mml:mi mathvariant=\"normal\">log<\/mml:mi><\/mml:mrow><mml:mo>\u2061<\/mml:mo><mml:mrow><mml:mo stretchy=\"false\">(<\/mml:mo><mml:mi>N<\/mml:mi><mml:mo>\/<\/mml:mo><mml:mi>r<\/mml:mi><mml:mo stretchy=\"false\">)<\/mml:mo><\/mml:mrow><\/mml:mrow><mml:mo stretchy=\"false\">)<\/mml:mo><\/mml:math> to <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M2\"><mml:mi mathvariant=\"normal\">O<\/mml:mi><mml:mo stretchy=\"false\">(<\/mml:mo><mml:mi>r<\/mml:mi><mml:mo stretchy=\"false\">)<\/mml:mo><\/mml:math>, where <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M3\"><mml:mrow><mml:mi>N<\/mml:mi><\/mml:mrow><\/mml:math> is the number of users and <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M4\"><mml:mrow><mml:mi>r<\/mml:mi><\/mml:mrow><\/mml:math> is the number of revoked users. To reduce the encryption burden for mobile devices, we use the online\/offline technology to shift the majority of encryption work to the offline phase, and then mobile devices only need to execute a few simple computations to create a ciphertext. In addition, we exploit a novel trick to prove its selective security under the <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M5\"><mml:mrow><mml:mi>q<\/mml:mi><\/mml:mrow><\/mml:math>-type assumption. Performance analysis shows that our scheme greatly improves the key-update efficiency for the trusted party and the encryption efficiency for mobile devices.<\/jats:p>","DOI":"10.1155\/2019\/8093578","type":"journal-article","created":{"date-parts":[[2019,2,14]],"date-time":"2019-02-14T18:31:12Z","timestamp":1550169072000},"page":"1-11","source":"Crossref","is-referenced-by-count":11,"title":["Efficient Ciphertext-Policy Attribute-Based Online\/Offline Encryption with User Revocation"],"prefix":"10.1155","volume":"2019","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7209-5318","authenticated-orcid":true,"given":"Haiying","family":"Ma","sequence":"first","affiliation":[{"name":"School of Computer Science and Technology, Nantong University, Nantong 226019, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0011-7861","authenticated-orcid":true,"given":"Zhanjun","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Science, Nantong University, Nantong 226019, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0350-3258","authenticated-orcid":true,"given":"Zhijin","family":"Guan","sequence":"additional","affiliation":[{"name":"School of Computer Science and Technology, Nantong University, Nantong 226019, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","reference":[{"key":"1","doi-asserted-by":"publisher","DOI":"10.1007\/11426639_27"},{"key":"6","doi-asserted-by":"publisher","DOI":"10.1007\/3-540-44647-8_3"},{"key":"8","doi-asserted-by":"publisher","DOI":"10.1007\/s10623-016-0287-3"},{"key":"9","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-54631-0_17"},{"issue":"6","key":"10","first-page":"1595","volume":"32","year":"2016","journal-title":"Journal of Information Science and Engineering"},{"key":"11","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-319-17533-1_23"},{"key":"12","doi-asserted-by":"publisher","DOI":"10.1016\/j.cose.2017.08.007"},{"key":"13","doi-asserted-by":"publisher","DOI":"10.1109\/tsc.2016.2520932"},{"key":"14","doi-asserted-by":"publisher","DOI":"10.1109\/TSC.2017.2710190"},{"key":"15","doi-asserted-by":"publisher","DOI":"10.1109\/tpds.2013.271"},{"key":"16","doi-asserted-by":"publisher","DOI":"10.1109\/TIFS.2015.2449264"},{"key":"17","year":"2017","journal-title":"Future Generation Computer Systems"},{"key":"18","doi-asserted-by":"publisher","DOI":"10.3724\/SP.J.1016.2012.01845"},{"key":"19","doi-asserted-by":"publisher","DOI":"10.1016\/j.future.2017.01.026"},{"issue":"8","key":"20","first-page":"1867","volume":"53","year":"2016","journal-title":"Jisuanji Yanjiu yu Fazhan\/Computer Research and Development"},{"key":"34","doi-asserted-by":"publisher","DOI":"10.1016\/j.ins.2018.07.077"},{"key":"21","doi-asserted-by":"publisher","DOI":"10.1007\/BF02254791"},{"key":"22","first-page":"247","volume-title":"Identity-based online\/offline encryption","year":"2008"},{"key":"25","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-03298-1_16"},{"key":"26","doi-asserted-by":"publisher","DOI":"10.1504\/IJSN.2013.055036"},{"key":"27","doi-asserted-by":"publisher","DOI":"10.1016\/j.ins.2014.10.020"},{"key":"28","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-32009-5_13"},{"key":"31","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-319-31517-1_17"},{"key":"33","doi-asserted-by":"publisher","DOI":"10.1109\/TIFS.2015.2410137"}],"container-title":["Security and Communication Networks"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/downloads.hindawi.com\/journals\/scn\/2019\/8093578.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/downloads.hindawi.com\/journals\/scn\/2019\/8093578.xml","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/downloads.hindawi.com\/journals\/scn\/2019\/8093578.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2019,2,14]],"date-time":"2019-02-14T18:31:17Z","timestamp":1550169077000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.hindawi.com\/journals\/scn\/2019\/8093578\/"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,2,14]]},"references-count":24,"alternative-id":["8093578","8093578"],"URL":"https:\/\/doi.org\/10.1155\/2019\/8093578","relation":{},"ISSN":["1939-0114","1939-0122"],"issn-type":[{"value":"1939-0114","type":"print"},{"value":"1939-0122","type":"electronic"}],"subject":[],"published":{"date-parts":[[2019,2,14]]}}}