基于混沌映射的图像块加密算法

针对图像置乱和扩散加密算法中的漏洞,提出一个明文信息可以参与的加密算法.通过耦合混沌序列来提取部分明文信息,采用提取的明文信息控制密钥的产生进而对明文加密.在加密的过程中,利用计算机二进制的特点进行分块加密,并对图像进行扩散处理.理论分析和仿真实验结果表明,该算法具有足够大的密钥空间,密文对密钥很敏感,能够抵抗明文攻击和统计攻击,比仅对图像置乱和扩散加密更安全,并且加密效果较理想,可广泛应用于信息安全领域.

Image Block Encryption Algorithm Based on Chaotic Maps

Aiming at the defects of image encryption algorithms which only use the chaotic system’s significant properties,such as sensitivity to initial condition,to scrambling and diffusion,a new image encryption method that has to do with the plaintext image is proposed.Partial plaintext information is extracted,which is used to control the generation of keys that are prepared for encrypting the plaintext,then in the process of encryption the characteristic of the binary is carried on block encryption,and a diffusion encryption for above image is further treated.Theoretical analysis and simulation demonstrate that the algorithm has a large key space,and its encryption image is very sensitive to keys,so it has a good ability of anti-plaintext attacks and anti-statistics attacks,and is more safer than only scrambling and diffusing for image,moreover the experimental result is ideal,thus it can be widely used in information security field.