Blockchain Covert Communication Model Based on 3D Model Steganography

In order to solve the problems of low embedding rate, weak robustness, and insufficient concealment in current blockchain covert communication, a blockchain covert communication model based on 3D model steganography is proposed. Firstly, combining blockchain and 3D models, a 3D model steganography based on the distance between 3D vertex coordinate vectors is proposed, which embeds hidden data into the 3D model by utilizing the distance between adjacent vertex coordinate vectors. Then, the generative text steganography based on the transaction amount is used to convert the identification information of the dense model into the blockchain transaction amount data according to the real amount distribution law. Subsequently, the Shuffle function and transaction address matrix are used to randomly generate the identity information of both parties in the transaction and package the transaction onto the chain. Finally, the receiving party obtains the encrypted transaction and decodes it in reverse to obtain the encrypted model, ultimately extracting hidden data from it. The experimental results show that the model can achieve MB-level data transmission, and the resistance rate to commonly used attack methods can reach about 90%, with high concealment and security.