A Block Location Scrambling Algorithm of Digital Image Based on Arnold Transformation

Currently there are many methods for calculating the periodicity of Arnold transformation and getting the inverse transformation, the use of traditional Arnold transformation for the image scrambling has become unsafe, for this issue it proposes an algorithm for digital image block location scrambling. It has improved the traditional Arnold transformation by adding two parameters a and b, furthermore it use Logistic map to generate the parameter sequences. The digital image is blocked, then carry out Arnold transformation with different parameters on each image block, after that put the transformed pixels on the corresponding position of the encrypted image, thus achieving image location scrambling. The results of simulation show that this algorithm can achieve good image encryption effect, and it has a large key space, key sensitivity. It basically meets the effectiveness and security requirements of image encryption.