KP-ABE mechanism emerges as one of the most
suitable security protocol for asymmetric encryption. It has been
widely used to implement access control solutions. However, due
to its expensive overhead, it is difficult to consider this protocol
in resource-limited networks, such as the IoT. As the cloud
has become a key infrastructural support for IoT applications,
it is interesting to exploit cloud resources to perform heavy
operations. In this paper, a collaborative variant of KP-ABE
named C-KP-ABE for cloud-based IoT applications is proposed.
Our proposal is based on the use of computing power and storage
capacities of cloud servers and trusted assistant nodes to run
heavy operations. A performance analysis is conducted to show
the effectiveness of the proposed solution.