摘要
为提高图像加密的安全性和加密速度,提出一种基于混沌理论的图像位平面的加密方法,同步地对每个像素点进行加密,在位平面上对行和列分别进行变换,并依靠混沌映射的初值敏感性来增加算法的随机性,保证加密的安全性,从而达到安全加密的目的。利用三维混沌映射的三个随机,将图像进行一维与二维、行与列的多次转化,达到彻底打乱图像的目的。仿真实验结果表明,该方法的加密效果理想,密钥量大,具有极高的安全性,并且加密速度也很快,对256×256的灰度图像,加密速度不超过0.1s,同时可以抵抗相关性分析及灰度直方图分析。
To improve the safety and speed of image encryption, a bit-shift image encryption algorithm based on chaotic map was proposed. Every pixel point could be encrypted synchronously, and the image was encrypted based on bit-shift operation in row and column. The random of algorithm was improved depending on initial value sensitivity of chaotic map, and the safety was guaranteed. Using three random sequence from three-dimensions chaotic map, the image was changed many times from one-dimension and two-dimensions, and row and column. This method can thoroughly disturb the image. Experimental results show that the algorithm was rapid, big key and secure. For a 256 × 256 image, the encryption time is less than 0.1 second. Application of this method could not only break the relation between each pixel but also resist the analysis of gray level histogram.
出处
《电机与控制学报》
EI
CSCD
北大核心
2013年第10期97-100,108,共5页
Electric Machines and Control
