An Equivalent Key Attack on an Image Cryptosystem
Feng Zhang · Dianzi xuebao · 2010
This paper examines the security of an image cryptosystem based on 3D chaotic Baker map.With known image,based on the affinity of 3D chaotic Baker map,the equivalent key of Baker map can be found by three linearly independent plain-cipher image grey values.The other equivalent key can be found by exhaustive attack.We estimate the computational complexity of our attack and prove that this image cryptosystem is insecure under the known image attack.