论文部分内容阅读
为了提高传统的基于混沌系统的数字图像的加密效果,提出了利用分数阶Liu混沌系统对数字图像进行加密的方法。首先,利用预估-校正法对分数阶Liu混沌系统进行数值计算,产生混沌序列;然后,将产生的混沌序列作为索引序列对数字图像进行混沌置乱加密,并利用反向置乱对加密图像进行解密;最后,通过设置微变分数阶阶数和微变初值对分数阶Liu混沌系统的数字图像加密系统的初值和分数阶阶数敏感性进行验证,并且对像素损坏后的加密数字图像的解密还原性能也进行了验证。实验表明,基于分数阶Liu混沌系统的数字图像加密方法对密钥敏感性和解密还原性都具有良好的效果。
In order to improve the encryption effect of traditional digital image based on chaotic system, a method of using fractional order Liu chaotic system to encrypt digital images is proposed. Firstly, the chaotic sequences of fractional order Liu chaotic system are numerically calculated by using the estimation-correction method. Then, the generated chaotic sequence is used as an index sequence to chaotic scramble the digital images, and the reverse scrambling is used to encrypt the encrypted images Finally, the initial value and fractional order sensitivity of the digital image encryption system of fractional-order Liu chaotic system are verified by setting the order of the micro-variation and the initial value of the micro-variation, and the encrypted digital Image decryption and reduction performance has also been verified. Experiments show that the digital image encryption method based on fractional-order Liu chaotic system has good effect on key sensitivity and decryption reduction.