基于二维压缩感知的有意义图像加密算法研究  

Research on meaningful image encryption algorithm based on 2-dimensional compressive sensing

作　　者：任花 牛少彰[1] 任如勇 岳桢 REN Hua;NIU Shaozhang;REN Ruyong;YUE Zhen(School of Computer,Beijing University of Posts and Telecommunications,Beijing 100876,China;Modern Educational Technology Center,Henan Normal University,Xinxiang 453007,China)

机构地区：[1]北京邮电大学计算机学院,北京100876 [2]河南师范大学现代教育技术中心,河南新乡453007

出　　处：《通信学报》2022年第5期45-57,共13页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61370195,No.U1536121)。

摘　　要：针对基于压缩感知的有意义图像加密算法存在加密图像视觉安全性不高及重构图像质量不佳的问题,提出了一种基于二维压缩感知的有意义图像加密算法。首先,设计了一种与明文相关联的混沌伪随机序列生成方法,利用全局随机置乱和灰度变换操作进行预加密,改进了重构图像质量。生成的预加密图像作为二维压缩感知的输入,在压缩加密和量化操作后,生成秘密图像。其次,考虑了待嵌入数据和待修改数据之间的关系,利用自适应嵌入方法修改载体系数值,提高了有意义加密图像的视觉安全性。最后,采用二维投影梯度重构方法联合执行解压缩和解密操作,获取重构图像。实验结果表明,与现有算法相比,所提算法不仅提高了加密图像视觉安全性和重构图像质量,而且能抵抗噪声和裁剪攻击。Aiming at the problems that the existing compressive sensing-based meaningful image encryption algorithms have low visual security of the encrypted images and poor quality of the reconstructed images,a 2-dimensional compressive sensing-based(2DCS)meaningful image encryption algorithm was proposed.Firstly,a chaotic pseudo-random sequence generation method associated with plaintext was designed,and the global random permutation and grayscale transformation operations were used for pre-encryption to improve the decrypted image quality.The generated pre-encrypted image was used as the input for 2DCS,and the secret image was generated after the compression encryption and quantization operations.Secondly,the relationship between the hidden and the modified data was considered,and an adaptive embedding method was adopted to modify the carrier coefficient values to improve the visual security of meaningful encrypted image.Finally,the 2-dimensional projection gradient reconstruction method was adopted to decompress and decrypt to obtain the decrypted image.The experimental results show that,compared with the existing algorithms,the proposed algorithm not only improves the visual security of encrypted image and the quality of reconstructed image,but also can resist noise and cropping attacks.

关 键 词：图像加密 二维压缩感知 有意义图像加密 嵌入技术 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]