云环境下基于自然对数序列的似混沌序列图像加密方案

针对云计算中图像数据的安全问题,提出一种基于自然对数序列的似混沌序列图像加密方案.提出自然对数序列的概念,验证其似混沌特性;使用二维猫映射对图像进行像素置乱,并在此基础上利用SM3杂凑算法和自然对数序列进行像素值扰乱,得到加密图像;在离散对数的假设下,证明方案具有IND-CCA安全.仿真实验表明,该方案在安全性上与混沌...

CHAOTIC-LIKE SEQUENCE IMAGE ENCRYPTION SCHEME BASED ON NATURAL LOGARITHMIC SEQUENCE IN CLOUD ENVIRONMENT

Aiming at the security of image data in cloud computing,a chaotic-like sequence image encryption scheme based on natural logarithmic sequences is proposed.Firstly,the concept of natural logarithm sequence was proposed,and its chaotic-like characteristic was verified.Secondly,the two-dimensional cat mapping was used to scramble the pixel position of the image.On this basis,SM3 hash algorithm and the chaotic-like sequence formed by the natural logarithmic sequence were used to disrupt the pixel value to obtain the encrypted image.Finally,under the assumption of the discrete logarithm problem,it is proved that the scheme has IND-CCA security.The simulation results show that the security of the scheme is similar to that of chaotic sequences,and the encrypted image has a larger key space and the ability to resist exhaustive attacks.In terms of efficiency,it has the characteristics of fast encryption and decryption speed and strong real-time,which is suitable for the privacy protection of image data in the cloud environment.