A bit transformation image encryption algorithm based on chaotic map
Pan Tian-gon · Dianji yu kongzhi xuebao · 2013
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.