Three-dimensional information hierarchical encryption based on computer-generated holograms

• Published in: Optics communications 2016-12, Vol.380, p.387-393
• Main Authors: Kong, Dezhao, Shen, Xueju, Cao, Liangcai, Zhang, Hao, Zong, Song, Jin, Guofan
• Format: Article
• Language: English
• Subjects: Chaotic sequence; Computer-generated hologram; Holography; Optical encryption
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2016.06.037

A novel approach for encrypting three-dimensional (3-D) scene information hierarchically based on computer-generated holograms (CGHs) is proposed. The CGHs of the layer-oriented 3-D scene information are produced by angular-spectrum propagation algorithm at different depths. All the CGHs are then modulated by different chaotic random phase masks generated by the logistic map. Hierarchical encryption encoding is applied when all the CGHs are accumulated one by one, and the reconstructed volume of the 3-D scene information depends on permissions of different users. The chaotic random phase masks could be encoded into several parameters of the chaotic sequences to simplify the transmission and preservation of the keys. Optical experiments verify the proposed method and numerical simulations show the high key sensitivity, high security, and application flexibility of the method. •The encrypted 3-D scene is reconstructed based on an encrypted computer generated hologram.•Hierarchical encryption guarantees the security of the 3-D scenes and increases the application flexibility of the method.•The chaotic random phase masks based on logistic map is determined by several parameters to simply the storage and transmission of key.