基于离散余弦变换与二维Ushiki混沌的图像加密

Image encryption based on discrete cosine transform and Ushiki map

提出了一种基于离散余弦变换与混沌随机相位掩模的图像加密方法。起密钥作用的两块混沌随机相位掩模由二维Ushiki混沌系统生成,Ushiki混沌系统的初值和控制参数可以替代随机相位掩模作为加解密过程中的密钥,因此便于密钥管理和传输。通过对密钥敏感性、图像相邻像素间的相关性、抗噪声攻击及抗剪切攻击等分析表明,图像加密方法具有较强的抵抗暴力攻击、统计攻击、噪声攻击和剪切攻击能力。

An image encryption method based on discrete cosine transform and Ushiki map is proposed.The two random phase masks are generated by Ushiki map.The initial values and control parameters of Ushiki map can replace the random phase masks to serve as the security keys.The management and transmission of security keys are convenient.The sensitivity of secret keys,the correlation of adjacent pixels,the robustness against noise and occlusion attacks demonstrate that the method has robustness against brute-force attack,statistical attack,noise attack and occlusion attack,etc.