Abstract
The main objective of this paper is to combine cryptography with digital watermarking to secure 3D multiresolution meshes. The result is a new crypto-watermarking algorithm which contains 3 parts: the first part is called watermark preparation and it aims to encrypt the logo using AES (Advanced Encryption Standard) algorithm, to combine the encrypted logo with a binary sequence obtained by transforming the description of the host mesh using ASCII (American Standard Code for Information Interchange) code and to encode the hole watermark using a convolutional encoder. As for the second part, it is said mesh preparation and it consists in applying a wavelet transform to the mesh in order to generate a wavelet coefficient vector. All these coefficients will be presented in the spherical coordinate system. Finally, the third part of our algorithm intervenes to insert the data in the mesh using the LSB (Least Signifiant Bit) method. Found results prove that we are able to insert a high amount of data without influencing the mesh quality. The application of the most popular attacks does not prevent a correct extraction of data already inserted. Our algorithm is, then, robust against these attacks.