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+necessitates+robust+access+control+mechanisms+to+secure+a+vast+array+of+interconnected+devices.+Most+of+the+existing+IoT+systems+in+practice+use+centralized+solutions.+We+identify+the+problems+in+such+solutions+and+adopt+the+blockchain+based+decentralized+access+control+approach.+Though+there+are+works+in+the+literature+that+use+blockchain+for+access+control%252C+there+are+some+gaps+in+these+works.+We+develop+a+blockchain+embedded+access+control+(BEAC)+framework+to+bridge+the+gaps.+First%252C+blockchain+based+solutions+for+access+control+require+an+enabling+P2P+network+while+existing+P2P+overlays+do+not+support+some+required+features.+We+develop+a+novel+P2P+infrastructure+to+seamlessly+support+our+BEAC+framework.+Second%252C+most+of+the+works+consider+blockchain+based+access+control+for+a+single+access+control+model%252C+and+we+develop+a+generic+blockchain+mechanism+and+show+that+it+can+support+the+embedding+of+various+access+control+models.+Finally%252C+existing+works+adopt+existing+blockchain+mechanisms+which+may+incur+a+high+communication+overhead.+We+develop+a+shortcut+approach+to+improve+the+number+of+message+rounds+in+the+access+protocol.+Our+experiments+demonstrate+the+efficacy+of+our+system%252C+showing+that+the+shortcut+mechanism+can+reduces+access+time+by+approximately+43%2525.&cdnurl=https%3a%2f%2fth.bing.com%2fth%2fid%2fR.03c159aff97fb82cada61362e9c28a07%3frik%3d6jR9pEU7yqQ34Q%26pid%3dImgRaw%26r%3d0&exph=630&expw=1200&q=Access+Control+in+Privacy+and+Security+in+Iot&FORM=IRPRST&ck=271400A1D29BA6991B63595C18C10F59&selectedIndex=29&itb=0)
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