A Confidential Information Hiding Scheme for 3D Model Based on Contour Analysis

Shuai Ren ； Aoxiong Fan ； Lei Shi ； Xuemei Lei ； Zhuoyi Dan

《International Journal of Network Security》 23卷4期 (2021/07) Pp. 677-684

https://doi.org/10.6633/IJNS.202107_23(4).13

摘要

3D model-based information hiding is an important topic in carrier-based confidential information sharing. In order to satisfy the requirements of confidential communication such as imperceptibility, robustness and capacity, an information hiding algorithm based on the interval analysis of values on z-axis for the vertical contour curves of 3D models. First, the 3D models will be scaled disproportionately and then rotated. Both the scaling and rotation are used to help the models fit a rectangle with fixed dimensions. And the vertical contour curves can be obtained by horizontal mapping. Second, the vertical contour curves will be mapped into the two-dimensional coordinate system and the interval distance values on the vertical axis can be preset as a fixed number. And then some vertical coordinate values will be picked out by the fixed interval distance. Last, one vertical coordinate value will be considered as the midpoint of a certain range, and all of the vertical coordinate values in this range will be changed into the same as the midpoint, and then will be converted into the binary numbers. From the theory analysis and experiment, it can be seen that the algorithm can effectively resist the scaling attack. According to the fixed rotation angle and the interval distance, the data can be embedded repeatedly as the in redundancy, which means the confidential information can be scattered into the whole model and the algorithm can be robust against cutting. Specifically, this algorithm is of strong robustness against the random noise under 0.2%, remeshing and non-uniform simplification.

關鍵字

3D Mesh ； Contour Analysis ； Information Hiding ； Two-Dimensional Mapping