基于Rossler超混沌系统的军事图像加密算法研究

Research on Military Images Encryption Algorithm Based on the Rossler Hyperchaotic System

对军事图像加密是确保其安全传输常用的方法。和一般图像相比,军事图像信息加密传输具有更高的安全保密要求。利用Rossler超混沌系统,提出基于位平面变换的混沌图像加密算法。该算法根据Rossler超混沌系统产生的混沌随机序列置乱明文图像,并对置乱图像进行位平面变换和按位异或操作,最后对像素值进行相应的扩散。理论分析和仿真实验结果表明,该算法加密效率高,能够较好地隐藏明文的统计特性,同时有效地防止选择密文攻击、统计及差分分析等攻击,可满足军事图像加密传输过程中高安全性的要求。

Encrypting military images is a regular method to ensure the safety of transmission.Compared with general images,the encrypted transmission of military images has higher security and confidentiality requirements.A chaotic image encryption algorithm based on bit plane transformation was proposed by using the Rossler hyperchaotic system.The plaintext was scrambled by the chaotic random sequence generated by the Rossler hyperchaotic system,and the bit plane transformation and Bitxor ope-ration was used on the scrambled image.At last,the pixel value of the processed image was diffused accordingly.Theoretical analysis and simulation results show that the method has high encryption efficiency,which can better hide the statistical characteristics of plaintext,and avoid chosen ciphertext attack,statistic and difference analysis attack.The method can satisfy the requirements of high security in the process of encrypted transmission of military images.