Journal
IEEE INTERNET OF THINGS JOURNAL
Volume 6, Issue 3, Pages 4671-4679Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JIOT.2018.2874222
Keywords
Blockchain; Internet of Things (IoT); security; time synchronization
Categories
Funding
- National Key Research and Development Program of China [2017YFB0802300]
- National Natural Science Foundation of China [61772403, U1401251]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JM6004]
- Fundamental Research Funds for the Central Universities
- National 111 Program of China [B16037, B08038]
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Internet of Things (IoT) has been developed rapidly to make our life easier. In many loT applications (e.g., smart homes, healthcare, etc.), all the IoT devices should be synchronized in time. However, some malicious nodes located in the IoT network can influence the time synchronization, which may interrupt the IoT system and lead to serious accidents. Therefore, it is critical and challenging to guarantee the accuracy and consistency of time during the time synchronization among all the IoT devices. In this paper, we propose a blockchain-based scheme to assure the security during time synchronization in IoT. Specifically, a publicly verifiable ledger is utilized to record and broadcast time, which can minimize many attacks from external environments. The use of multiple time sources can avoid the vulnerabilities caused by the centralized generation of accurate time. Moreover, the decentralized structure of this scheme has the advantage of adapting the changes of network topology. By employing an improved practical Byzantine fault tolerance consensus mechanism, time synchronization can be implemented efficiently. At last, the analysis results show that our proposed scheme can achieve the desired security with high efficiency.
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