基于假分数阶激光混沌的数字图像加密研究

为提高信息加密的安全性,设计了一种基于假分数阶激光混沌系统的加密算法,密钥空间由系统的初始状态变量、参数和分数阶次构成,且把所有明文像素值代入密钥,从而提高算法的抗破解能力.数值模拟中对Lena灰度图和Couple彩色图等数字图像进行加密.理论分析和数值仿真表明,该算法的加密空间大,可以有效抵抗密文攻击、差分攻击、选择明文攻击和统计攻击,在多媒体数据的安全通信中具有发展潜力.

Research on Encryption of Digital Image Based on Improper Fractional-order Laser Chaos

To improve the safety of information encryption, based on an improper fractional-order laser chaos, a digital image encryption algorithm is proposed. The key space is formed by initial state variables, parameters and orders of the system. Every pixel value is included in secret key, so as to improve anti-attack capability of the algorithm. Lena gray image and Couple color image are encrypted in numerical simulation. Theoretical analysis and simulation results show that this algorithm with a sufficiently large key space not only can perfectly resist the ciphertext attack and differential attack, but also is excellent against chosen plaintext attack and statistical attack, which can be used in secure communication of multimedia data.