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The ubiquitous presence of smart devices along with advancements inconnectivity coupled with the elastic capabilities of cloud and edge systemshave nurtured and revolutionized smart ecosystems. Intelligent, integratedcyber-physical systems offer increased productivity, safety, efficiency, speedand support for data driven applications beyond imagination just a decade ago.Since several connected devices work together as a coordinated unit to ensureefficiency and automation, the individual operations they perform are oftenreliant on each other. Therefore, it is important to control what functions oractivities different devices can perform at a particular moment of time, andhow they are related to each other. It is also important to consider additionalfactors such as conditions, obligation or mutability of activities, which arecritical in deciding whether or not a device can perform a requested activity.In this paper, we take an initial step to propose and discuss the concept ofActivity-Centric Access Control (ACAC) for smart and connected ecosystem. Wediscuss the notion of activity with respect to the collaborative anddistributed yet integrated systems and identify the different entities involvedalong with the important factors to make an activity control decision. Weoutline a preliminary approach for defining activity control expressions whichcan be applied to different smart objects in the system. The main goal of thispaper is to present the vision and need for the activity-centric approach foraccess control in connected smart systems, and foster discussion on theidentified future research agenda.

Towards Activity-Centric Access Control for Smart Collaborative Ecosystems