Arnold变换和混沌映射的计算全息多图像同步加密

Multiple-image encryption using computer generated hologram based on Arnold transform and chaotic mapping

为同步加密多幅图像信息,提出一种基于计算全息的多图像加密方法。该方法使用全息图同步记录多图像信息,再利用Arnold变换和混沌映射来置乱、替代全息图的像素值,得到最终的加密图像。解密过程中,使用正确密钥还原全息图的像素值及其像素位置分布,经全息再现即可重建对应的图像信息。较传统的计算全息多图像加密方式,该加密算法提高了密钥空间和密钥敏感度,有利于信息的安全传输。实验结果验证了算法的安全性和鲁棒性。

In order to achieve the simultaneous encryption for multiple- image, a multiple- image encryption method based on computer generated hologram （CGH） is proposed. Utilized the Arnold transform and the chaotic mapping to scramble and replace pixel values of the holograms, the final encrypted image is created after the multipleimage information is synchronously recorded with holograms. The corresponding information can be reconstructed by restored pixel values and positions of holograms with correct keys in decrypting. Compared to the traditional CGH multiple-image encryption, the proposed method improves the key space and key sensitivity, and the security of information transmission. The simulation results verify the safety and robustness of the proposed method.