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Chaos-based encryption for fractal image coding

Chinese Physics B 2012年第1期21卷 115-126页

作者：袁正雄黄国和 Department of Electronic Engineering City University of Hong Kong

A chaos-based cryptosystem for fractal image coding is proposed. The Renyi chaotic map is employed to determine the order of processing the range blocks and to generate the keystream for masking the encoded sequence. Compared with the standard approach of fraetal image coding followed by the Advanced encryption Standard, our scheme offers a higher sensitivity to both plaintext and ciphertext at a comparable operating efficiency. The keystream generated by the Renyi chaotic map passes the randomness tests set by the United States National Institute of Standards and Technology, and so the proposed scheme is sensitive to the key.

关键词： chaos cryptography joint image compression and encryption fractal image coding

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CRYPTANALYSIS ON SECURE FRACTAL image CODING BASED ON FRACTAL PARAMETER encryption

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FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY 2012年第1期20卷 41-51页

作者： Yuen, Ching-Hung Wong, Kwok-Wo City Univ Hong Kong Dept Elect Engn Kowloon Tong Hong Kong Peoples R China

The vulnerabilities of the selective encryption scheme for fractal image coding proposed by Lian et al.(1) are identified. By comparing multiple cipher-images of the same plain-image encrypted with different keys, the positions of unencrypted parameters in each encoded block are located. This allows the adversary to recover the encrypted depth of the quadtree by observing the length of each matched domain block. With this depth information and the unencrypted parameters, the adversary is able to reconstruct an intelligent image. Experimental results show that some standard test images can be successfully decoded and recognized by replacing the encrypted contrast scaling factor and brightness offset with specific values. Some remedial approaches are suggested to enhance the security of the scheme.

关键词： Fractal image Coding joint image compression and encryption Selective encryption Cryptanalysis

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