“…They are also illustrated in Figure 1. ("Internet of Things" OR "IoT") AND "Security" AND ("Authentication" OR "Authorization" OR "Identity" OR "Access control") AND NOT ("Network" OR "Hardware" OR "RFID" OR "Protocol" OR "Cryptography" OR "Survey" OR "Study") IEEE Xplore (("Abstract": "Internet of Things" OR "Abstract": "IoT") AND ("Abstract": "Authentication" OR "Abstract": "Authorization" OR "Abstract": "Identity" OR "Abstract":"Access Control") AND "Index Terms": "Security" AND NOT(Search Index Terms: "Network" OR "Abstract": "Hardware" OR "Abstract": "Cryptography" OR "Abstract": "Protocol" OR "Document Title": "Survey" OR "Abstract": "RFID" OR "Document Title":"Study")) ACM DL recordAbstract:(IoT "Internet Of Things") AND recordAbstract:(Authentication Authorization Identity "Access Control" -Hardware -Cryptography -Protocol -RFID) AND acmdlTitle:(-Study -Survey) AND keywords.author.keyword:(-Hardware -Physical -Network) WoS ("internet of things" OR IoT) AND TOPIC: (Security) AND TOPIC: (Authentication OR Authorization OR Identity OR "Access Control") NOT TOPIC: (Hardware OR Cryptography OR Protocol OR RFID OR Physical OR Network) NOT TOPIC: (Study OR Survey) SpringerLink (Authentication OR Authorization OR Identity OR "Access Control") + title ("Internet of Things" OR IoT) ScienceDirect TITLE-ABSTR-KEY("Internet of Things" OR "IoT") AND TITLE-ABSTR-KEY(Authentication OR Authorization OR Identity OR "Access Control") AND KEY(Security) AND NOT (TITLE-ABSTR-KEY(Hardware OR Cryptography OR Protocol OR RFID) OR title(study OR survey) OR key(Physical OR Network)) (viii) healthcare: projects that specifically address the healthcare domain [18,22,28,32,41,53] (ix) attribute-based subset of authorization proposals that involve ABAC [15,28,32,34,38,53] (x) roles: subset of authorization proposals that involve RBAC [18,28,29] Two of the papers do not fit into any of the above categories [55,56]. One article [55] is likely too short for RAKE to perform any meaningful analysis; with the second article [56], we do not identify any obvious reason for not being categorized.…”