Geometry-preserving Encryption for 3D Meshes

This paper introduces a geometry-preserving protection paradigm that heavily distorts 3D objects while preserving some intrinsic geometrical property (e.g. the bounding box or the convex hull), thereby avoiding a global corruption of the whole 3D scene. Backward compatibility is guaranteed de facto : legacy non-compliant rendering engines can display 3D scenes containing protected objects, but only compliant renderers with the necessary credentials can display deprotected objects. We propose a couple of permutation-based encryption algorithms embracing this geometry-preserving strategy and then detail some challenges related to them. For instance, we discuss the sideeffects of such protection mechanisms on other baseline 3D primitives, e.g. the rendering time, as well as the difficulty of assessing the security of such algorithms.