A 3D Model Authentication Scheme Based on Secret Sharing in Cloud Environment

Abstract

Aiming at the problem that the data of the 3D model is lost or unavailable in the cloud storage of multiple nodes, the node data is easily destroyed and the data integrity cannot be guaranteed, a 3D model authentication scheme based on secret sharing in the cloud environment is proposed. Firstly, the original STL secret file of 3D model was selected from the standard image library, and Lagrange interpolation polynomial was used to construct the secret polynomial to generate secret fragments of 3D model files, which were distributed and stored in multiple secret participants. Secondly, the source file and secret sharing sub-fragment are used as the original structural carrier, and the SM3 hash algorithm of Chinese commercial password is used to generate the digital digest of the source file and each secret fragment, and the digital digest generated by each secret fragment is distributed upload to the cloud. Finally, Shamir's (k, n) threshold secret sharing algorithm is used to detect the change of 3D model information and to protect the integrity of the encrypted 3d model data, the consistency of the digital digests of the encrypted 3D model before and after encryption is verified. Experimental analysis shows that the invisibility, robustness and analyzability of the dense 3D model have been improved, effectively preventing fraud in the secret sharing process, and providing a reliable technical means for protecting 3d model in cloud environment.