基于Logistic映射的压缩图像加密算法

大多数的图像加密算法是针对整幅图像的,加密、解密和传输效率较低.利用局部图像的特点,采用自适应的分块方法以及多种块分类技术相结合对图像进行块分解,借助Logis-tic映射产生的混沌序列分别对分解后的图像序列块进行不同密钥的加密.经实验验证,该方法不仅增加了输出密钥序列的周期性和安全性,而且提高了加密、解密速度及传输效率,加密、解密效果良好.

Encryption of compressed image based on logistic mapping

Most image encryption algorithms are applied to the whole image,so the efficiency of encryption,decryption and transmission is low.According to the characteristics of local image,the image is divided by adaptive block method and a variety of block classification techniques.With the chaotic sequence by Logistic mapping,the de-composed image sequences are encrypted respectively with different encryption keys.The experiments prove that this method increases the periodicity and security of output key sequence.It also improves the speed of encryption,decryption and transmission.The results of encryption and decryption are good.