Over the last few decades, the proliferation of the Internet of Things (IoT) has produced an
overwhelming flow of data and services, which has shifted the access control paradigm from …

The last decades have seen a growing interest and demand for community-centered
collaborative systems and platforms. These systems and platforms aim to provide an …

With the rapid advances in computing and information technologies, traditional access
control models have become inadequate in terms of capturing fine-grained, and expressive …

Policy-driven management is gaining popularity today, mainly due to the ever-growing scale
and complexity of large networked systems. In these systems, policies are usually used to …

User-to-user (U2U) relationship-based access control has become the most prevalent
approach for modeling access control in online social networks (OSNs), where authorization …

Users and resources in online social networks (OSNs) are interconnected via various types
of relationships. In particular, user-to-user relationships form the basis of the OSN structure …

Access control policy is typically defined in terms of attributes, but in many applications it is
more natural to define permissions in terms of relationships that resources, systems, and …

The popularity of online social networks (OSNs) makes the protection of users' private
information an important but scientifically challenging problem. In the literature, relationship …

Users and resources in online social networks (OSNs) are interconnected via various types
of relationships. In particular, user-to-user relationships form the basis of the OSN structure …

Any decentralized, distributed network isvulnerable to the Sybil attack wherein a malicious
node masquerade as several different nodes, called Sybil nodes disrupting the proper …