Research And Design Of Information Hiding Algorithm Based On Geometric Features Of 3D Models

In the era of big data,with the rapid development of emerging computer technology,a large amount of confidential data is transmitted in the network.As an important digital transmission medium,3D models are increasingly widely used in various fields,but the corresponding information security issues are also becoming increasingly severe.The information hiding technology based on 3D models is an effective means of protecting data security,which can achieve the covert transmission of secret information.Studying this technology has important value and significance.This article delves into the representation of 3D models,preprocessing rules for secret information,expression conversion strategies and embedding strategies between secret information and 3D carriers from the perspectives of single and multiple carriers.Based on the characteristics of large hiding capacity,good hiding effect,and multiple hiding methods of 3D models,combined with the geometric features of 3D models,two information hiding algorithms are proposed:1.A 3D model information hiding algorithm based on curvature radius.Firstly,calculate the curvature of all triangles in each 3D model,and use clustering algorithm to group triangles based on their curvature radius;Secondly,the secret information optimized by scrambling and genetic algorithm is embedded by changing the mean curvature radius of each group;Finally,by changing the curvature radius,the vertices of the selected triangular patch are modified to reduce the impact of secret information on the 3D model.2.Information hiding algorithm based on three-dimensional model fusion state spherical analysis.First,the 3D model is normalized,and the global features obtained from the shape distribution function are used to measure the similarity of the 3D model to complete the classification of similar models,and then the similar models are fused by circumscribed sphere to complete the carrier fusion state processing;Secondly,robust points are labeled based on the curvature characteristics of each point in the fusion state point cloud of similar carriers,and the matching relationship between secret information and carriers is optimized through spherical segmentation;Finally,the secret information is embedded by changing the least significant bit of the carrier vertex.The simulation comparison experiment of the 3D model information hiding algorithm based on curvature radius shows that the algorithm has increased the average SNR of 4.31%and 8.57% in terms of invisibility compared to the comparison algorithm,respectively;In terms of robustness,when faced with 2% noise addition,60% mesh simplification,30% cropping,and 60% compression,the algorithm’s Corr value increased by 1.13% and 25.53% respectively compared to the comparison algorithm;7.54% and 17.67%;5.19% and 25.68%;6.08% and15.11%.The simulation comparison experiment of the information hiding algorithm based on three-dimensional model fusion state spherical analysis shows that the algorithm reduces the Hausdorff distance by 7.52% and 14.78% respectively in terms of invisibility compared to the comparison algorithm;In terms of robustness,when faced with joint attacks of 0.5% noise,40%simplification,30% compression and 10% cutting,the BCR value can still be maintained above60%.Compared with the comparison algorithm,the two algorithms proposed in this article have significant improvements in invisibility and robustness,and are suitable for information communication with high requirements for security and reliability.They have a positive role in promoting the healthy development of network security.