Encryption domain three-dimensional model reversible information hiding method based on prediction error extension

Abstract

The invention discloses an encryption domain three-dimensional model reversible information hiding method based on prediction error extension. In a traditional method, due to invisibility of an encrypted three-dimensional model, data security protection of the three-dimensional model cannot be achieved. According to the method, a Paillier encryption system is used for encrypting the three-dimensional model, so that the privacy of the three-dimensional model is protected. The method comprises the following steps: firstly, dividing vertexes into an embedded vertex set and a reference vertex setby utilizing the characteristic that the vertexes of embedded information are not adjacent to each other; secondly, calculating a prediction error of the embedded vertex set by utilizing the referencevertex set; and finally, expanding the module length of the prediction error by utilizing the embedded secret key so as to embed secret information; at a receiving end, extracting secret informationby comparing the module length value ranges of the prediction errors, and recovering the original model by utilizing the reference vertex set. Compared with a traditional method, the method has the advantages that the bit error rate is low when the secret information is extracted, the directly decrypted model has less distortion, and the information hiding capacity is improved to a certain extent.

Description

technical field [0001] Aiming at the field of three-dimensional model reversible information hiding, the invention proposes a three-dimensional model reversible information hiding method based on prediction error expansion. Background technique [0002] With the widespread use of three-dimensional (3D) models and related applications, research on the security protection of 3D model data has been promoted [1-2]. For the security issues of 3D models, the method of embedding watermark is usually adopted. Watermarks are mainly divided into robust watermarks and fragile watermarks. Robust watermarks [3] can resist attacks on data carriers, while fragile watermarks [4] are used to implement integrity authentication. Reversible information hiding (RDH) is a branch of fragile watermarking, which can restore the original data without loss [5-6]. For some occasions that require high data authentication, such as encrypted data labeling and judicial authentication in the cloud environ...

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Problems solved by technology

However, while cloud computing technology facilitates people's lives, it also raises issues of data security and privacy protection.

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