  Internet of Things (IoT) provides the possibility for milliards of devices
throughout the world to communicate with each other, and data is collected
autonomously. The big data generated by the devices should be managed securely.
Due to security challenges, like malicious nodes, many approaches cannot
respond to these concerns. In this paper, a robust hybrid method, including
encryption, is used as an efficient approach for resolving the RPL protocol
concerns so that the devices are connected securely. Therefore, the proposed
DSH-RPL method for securing the RPL protocol comprises the four following
phases: The first phase creates a reliable RPL. The second phase detects the
sinkhole attack. The third phase quarantines the detected malicious node, and
the fourth phase transmits data through encryption. The simulation results show
that the DSH-RPL reduces the false-positive rate more than 18.2% and 23.1%, and
reduces the false-negative rate more than 16.1% and 22.78%, it also increases
the packet delivery rate more than 19.68% and 25.32% and increases the
detection rate more than 26% and 31% compared to SecTrust-RPL and IBOOS-RPL.
