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Smart medical systems have become the most effective and practical solutions to provide users with low-cost, noninvasive, and long-term continuous health monitoring. Recently, Jia et al. proposed an authentication and key agreement scheme for smart medical systems based on fog computing and indicated that it is safe and can withstand a variety of known attacks. Nevertheless, we found that it consists of several flaws, including known session-specific temporary information attacks and lack of per-verification. The opponent can readily recover the session key and user identity. In this paper, we propose a secure authentication and key agreement scheme, which compensates for the imperfections of the previously proposed. For a security evaluation of the proposed authentication scheme, informal security analysis and the Burrows\u2013Abadi\u2013Needham (BAN) logic analysis are implemented. In addition, the ProVerif tool is used to normalize the security verification of the scheme. Finally, the performance comparisons with the former schemes show that the proposed scheme is more applicable and secure.<\/jats:p>","DOI":"10.1155\/2021\/6658041","type":"journal-article","created":{"date-parts":[[2021,1,31]],"date-time":"2021-01-31T22:50:10Z","timestamp":1612133410000},"page":"1-16","source":"Crossref","is-referenced-by-count":41,"title":["Improved Authenticated Key Agreement Scheme for Fog-Driven IoT Healthcare System"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8970-2452","authenticated-orcid":true,"given":"Tsu-Yang","family":"Wu","sequence":"first","affiliation":[{"name":"College of Computer Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China"},{"name":"School of Information Science and Engineering, Fujian University of Technology, Fuzhou 350118, China"},{"name":"Fujian Provincial Key Laboratory of Big Data Mining and Applications, Fujian University of Technology, Fuzhou 350118, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3640-589X","authenticated-orcid":true,"given":"Tao","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Information Science and Engineering, Fujian University of Technology, Fuzhou 350118, China"},{"name":"Fujian Provincial Key Laboratory of Big Data Mining and Applications, Fujian University of Technology, Fuzhou 350118, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8198-2549","authenticated-orcid":true,"given":"Yu-Qi","family":"Lee","sequence":"additional","affiliation":[{"name":"School of Information Science and Engineering, Fujian University of Technology, Fuzhou 350118, China"},{"name":"Fujian Provincial Key Laboratory of Big Data Mining and Applications, Fujian University of Technology, Fuzhou 350118, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3860-4208","authenticated-orcid":true,"given":"Weimin","family":"Zheng","sequence":"additional","affiliation":[{"name":"College of Computer Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China"},{"name":"School of Information Science and Engineering, Fujian University of Technology, Fuzhou 350118, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4929-5383","authenticated-orcid":true,"given":"Saru","family":"Kumari","sequence":"additional","affiliation":[{"name":"Department of Mathematics, Chaudhary Charan Singh University, Meerut, Uttar Pradesh 250004, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5324-2156","authenticated-orcid":true,"given":"Sachin","family":"Kumar","sequence":"additional","affiliation":[{"name":"Department of Computer Science and Engineering, Ajay Kumar Garg Engineering College, Ghaziabad 201009, India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","reference":[{"issue":"1","key":"1","first-page":"1","article-title":"A survey on intelligent sensor network and its applications","volume":"1","author":"F. 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