A SOLUTION FOR PRIVACY-PRESERVING DATA SHARING ON PEER-TO-PEER NETWORKS

Tóm tắt

Digital data, in many fields, such as banking or medicine, must be protected when storing and sharing on the Internet. Moreover, in some cases, the integrity of shared data must also be guaranteed such that there is no modification on the shared data. In this paper, the following scenario is analysed: A pharmaceutical company which is doing research on a X cancer, broadcasting on the Internet that the company wants to buy DNA data of those having the X. The questions are: (1) How should a user share securely and anonymously her/his DNA data to the company? and (2) How could the company determine the integrity of receiving DNA data before paying for an online contract? These problems can be solved based on the blockchain technology. A protocol is proposed for guaranteeing the privacy, integrity, and authentication of data shared on the peer-to-peer network. The designed protocol is a combination of three components, including the blockchain (BC) technology, the interplanetary file system (IPFS), and cryptosystems. Data are transferred directly to the recipients without using any central system. The information of the data sharing process is published on a blockchain, and users can verify the integrity and authentication of the original data but cannot know the content of the data. The experimental results show that the protocol satisfies the security requirements and can be easily implemented in practice.