Trusted and Flexible Electronic Certificate Catalog Sharing System Based on Consortium Blockchain

The development of information and communication technology has influenced every dimension of society, including the way government interacts with citizens. Government bodies at all levels across the country issued a serial of guidelines to promote e-government services' quality and efficiency which include six national standards for electronic certificates. The legal validity of electronic certificates is equal to that of paper certificates issued by authorities at provincial, autonomous regional, municipal levels and related departments. This fact will accelerate the construction of e-government to further benefit people and motivate the market. In this paper, we propose a trusted and flexible electronic certificates catalog sharing (ECCS) system based on consortium blockchain to promote the accessibility and efficiency of e-government services which take advantage of immutability and time-stamping of transaction data in blockchain. Security analysis indicates that ECCS can achieve privacy-preservation of electronic certificates and catalog against unauthorized users, integrity of electronic data and authentication of data source. In comparison with other existing schemes which also achieve electronic certificates sharing services, ECCS has better efficiency in terms of traffic loads, and can fit for all scenarios related to electronic certificates sharing.