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 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, we consider the following scenario: a pharmaceutical company which is doing research on a X cancer, broadcasts on Internet that the company wants to buy DNA data of those who have had this 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 received DNA data before paying for an online contract? These problems can be solved based on the blockchain technology. We propose a protocol for guaranteeing the privacy, integrity, and authentication of data sharing 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), cryptosystems. Data is transferred directly to recipients without using any central system. The information of the data sharing process is published on a blockchain, users can verify the integrity and authentication of the original data but cannot know the content of the data. The experimental results show that our protocol satisfies the security requirements, can easily implement in practice.