An Image Encryption Method Based on Independently and Uniformly Distributed Chaotic Key Stream

摘要

This study proposes an image encryption method using variable parameter one-dimensional chaotic system which can generate Independently and Uniformly Distributed (IID) chaotic key stream by the certain sampling way. Firstly, the paper introduces a fast algorithm to the theorem in [24] which can generate an IID chaotic key stream from a class of topologically conjugate maps of Tent Map. Secondly, an image encryption method is proposed, including the confusion and diffusion process as follows two steps: first the position of pixels in an image is confused by employing the pre-random sequence produced from chaotic value sort transformation; then the image pixel is encrypted by the IID key stream through XOR operation. Finally, the experiment is illustrated to prove that the proposed image encryption method is valid, and the algorithm can be used in the actual image encryption.