Research on Design Document Tampering Detection and Location Based on Blockchain Technology

This paper decomposes the multi-element DXF format design file, extracts the most important layer, block, entity element and the number of entities according to the elements, and constitutes the characteristics of the design file; Then, the extracted features are taken as the underlying leaves, and the Merkel tree based on MD5 algorithm is used to get the tamper proof code. By comparing the tamper resistant code, we can detect whether tampering occurs and locate the tampering location, and store the tamper resistant code and tampering location information on the chain, using the characteristics of the blockchain to ensure that they are not tampered and traceable.