Rethinking Blockchains in the Internet of Things Era from a Wireless Communication Perspective
This work addresses security issues for IoT networks using blockchains, but it is incremental as it focuses on analyzing existing trade-offs without introducing a new method.
The paper tackles the challenge of ensuring security in IoT networks by analyzing how unreliable wireless communication affects blockchain security, showing that adversarial nodes can tamper blocks with less computing power by hindering block propagation.
Due to the rapid development of Internet of Things (IoT), a massive number of devices are connected to the Internet. For these distributed devices in IoT networks, how to ensure their security and privacy becomes a significant challenge. The blockchain technology provides a promising solution to protect the data integrity, provenance, privacy, and consistency for IoT networks. In blockchains, communication is a prerequisite for participants, which are distributed in the system, to reach consensus. However, in IoT networks, most of the devices communicate through wireless links, which are not always reliable. Hence, the communication reliability of IoT devices influences the system security. In this article, we rethink the roles of communication and computing in blockchains by accounting for communication reliability. We analyze the tradeoff between communication reliability and computing power in blockchain security, and present a lower bound to the computing power that is needed to conduct an attack with a given communication reliability. Simulation results show that adversarial nodes can succeed in tampering a block with less computing power by hindering the propagation of blocks from other nodes.