Private Personal Information Verification

Abstract

Physical document verification is a necessary task in the process of reviewing applications for a variety of services, such as loans, insurance, and mortgages. This process consumes a large amount of time, money, and human resources, which leads to limited business throughput. Furthermore, physical document verification poses a critical risk to clients’ personal information, as they are required to provide sensitive details and documents to verify their information. In this paper, we present a systematic approach to address shortcomings in the current state of the processes used for physical document verification. Our solution leverages a semi-trusted party data source ( i.e. a governmental agency) and cryptographic protocols to provide a secure digital service. We make use of homomorphic encryption and secure multi-party computation to develop a series of protocols for private integer comparison and (non-) membership testing. Secure boolean evaluation and secure result aggregation schemes are proposed to combine the results of the evaluation of multiple predicates and produce the final outcome of the verification process. We also discuss possible improvements and other applications of the proposed secure system of protocols. Our framework not only provides a cost-efficient and secure solution for document verification, but also creates space for a new service.