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Demands of IoT have lately attracted huge attention, and organizations are excited about the business value of the data that will be generated by deploying such networks. On the contrary, IoT has various security and privacy concerns for the end users that limit its proliferation. In this paper, we have identified, categorized, and discussed various security challenges and state-of-the-art efforts to resolve these challenges.<\/jats:p>","DOI":"10.1155\/2019\/9629381","type":"journal-article","created":{"date-parts":[[2019,1,10]],"date-time":"2019-01-10T18:34:29Z","timestamp":1547145269000},"page":"1-14","source":"Crossref","is-referenced-by-count":160,"title":["Understanding Security Requirements and Challenges in Internet of Things (IoT): A Review"],"prefix":"10.1155","volume":"2019","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4683-1988","authenticated-orcid":true,"given":"Sufian","family":"Hameed","sequence":"first","affiliation":[{"name":"IT Security Lab, Department of Computer Science, National University of Computer and Emerging Sciences (NUCES), Karachi, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Faraz Idris","family":"Khan","sequence":"additional","affiliation":[{"name":"IT Security Lab, Department of Computer 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