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With the rapid development of the Internet of things (IoT), more and more IoTdevices are connected and communicate frequently. In this background, thetraditional centralized security architecture of IoT will be limited in termsof data storage space, data reliability, scalability, operating costs andliability judgment. In this paper, we propose an new key information storageframework based on a small distributed database generated by blockchaintechnology and cloud storage. Specifically, all encrypted key communicationdata will be upload to public could server for enough storage, but theabstracts of these data (called "communication logs") will be recorded in "IoTledger" (i.e., an distributed database) that maintained by all IoT devicesaccording to the blockchain generation approach, which could solve the problemof data reliability, scalability and liability judgment. Besides, in order toefficiently search communication logs and not reveal any sensitive informationof communication data, we design the secure search scheme for our "IoT ledger",which exploits the Asymmetric Scalar-product Preserving Encryption (ASPE)approach to guarantee the data security, and exploits the 2-layers index whichis tailor-made for blockchain database to improve the search efficiency.Security analysis and experiments on synthetic dataset show that our schemesare secure and efficient.

Secure and Efficiently Searchable IoT Communication Data Management Model: Using Blockchain as a new tool