A blockchain-based trusted sharing method for railway transportation BIM data

In recent years, Building Information Modeling (BIM) has been widely used in the field of rail transit and plays an important role. Due to the numerous and complex elements of BIM file data, they are shared and used by multiple departments. Traditional BIMs that exist in the form of files are stored independently on centralized servers or local machines, lacking systematic management methods. Data update and maintenance are quite cumbersome. Besides, multi-departmental interaction and collaboration are inefficient and untrustworthy. Therefore, we propose a blockchain-based trusted sharing method for rail transit BIM data. First, a blockchain-based distributed BIM data sharing system architecture is proposed. Second, smart contracts are designed to achieve on-chain protection and shared use of digital resources such as rail transit BIM models. Third, the BIM data access control mechanism based on attribute-based encryption is proposed, and we implement a prototype of a trusted shared access system with permission control for multiple departments based on the InterPlanetary File System (IPFS) and the security mechanisms of Software Guard Extensions (SGX). Finally, the feasibility of the method is verified through scheme comparison, security analysis, and prototype system performance testing.