Cryptanalysis of an encryption scheme for binary images

In 1998, Chung and Chang proposed a new method to encrypt binary images. When compared to its predecessors, their method can actually obtain better compression ratio by putting different scan patterns at the same level in the scan tree structure and using the two-dimensional run-encoding technique. However, their scheme seems to be quite vulnerable to attacks if it uses the same key to encrypt different images. In this paper, we show that their scheme can be broken with some pairs of plain image and cipher image. (C) 2002 Elsevier Science B.V. All rights reserved.