Research On Data Privacy Protection Of Contact Tracing From The Perspective Of Engineering Ethics

Digital Contact Tracing(DCT)can slow the spread of a pandemic by calculating historical trace data to identify potentially infected people.However,how to reasonably use the spatiotemporal data of users and patients in DCT and protect the privacy of both parties has become a hot research issue in the field of contact tracing.Due to the challenges of spatial and temporal data privacy in the practical application of DCT,for example,in the data collection and storage stage,it is easy to disclose personal privacy due to malicious attacks,or in the data processing and application stage,it is unauthorized to use private data without the user’s authorization and consent.How to find a balance between application implementation and privacy protection has attracted more and more attention.The analysis of the DCT scheme from the perspective of engineering ethics can obtain a more comprehensive perspective of privacy protection,covering as far as possible the possible leakage aspects of spatiotemporal data privacy,to protect personal privacy.Aiming at the shortcomings of existing contact tracking applications,this paper introduced the idea of Private Set Intersection(PSI)and applied it in DCT.A set of solutions to the spatiotemporal data privacy challenges in data processing and application are presented.The main work is as follows:First,this paper designs the spatiotemporal intersection computing protocol(STI-PSI)based on PSI,analyzes the correctness of the protocol under the semi-honest model,and proves its security.Then,the experimental comparison between the STI-PSI protocol and classical PSI protocol shows that when the data scale is large,the protocol proposed in this paper requires a lower running time than the PSI protocol based on homomorphic encryption.Moreover,in the same protocol comparison experiment based on oblivious transfer extension,the STI-PSI protocol also requires a lower running time than the PSI protocol when the data scale reaches millions.Second,this paper designs a contact tracing scheme based on spatiotemporal intersection computing protocol.After combining demand analysis and scheme design,corresponding functional modules are developed for the health center server and the user client respectively.In addition,the performance test of the scheme is carried out in six simulated scenarios,which has the advantage of efficient operation when the data scale is small.Finally,this paper constructs an engineering ethical risk analysis framework for contact tracing,which is analyzed from three perspectives:technical ethics,individual ethics,and social ethics.In addition,the privacy protection measures of contact tracing are discussed and analyzed according to the life cycle of spatiotemporal data.