CRYPTANALYSIS ON SECURE FRACTAL IMAGE CODING BASED ON FRACTAL PARAMETER ENCRYPTION

doi:10.1142/S0218348X12500041

2012-04-30

PRE

Yuen, Ching-Hung *

Wong, Kwok-Wo

DOI：10.1142/S0218348X12500041

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摘要

En 中文

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.

Keyword:

Fractal Image Coding

Joint Image Compression and Encryption

Selective Encryption

Cryptanalysis

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期刊

Fractals-Complex Geometry Patterns and Scaling in Nature and Society

IF:

2.9

论文数:

2.8K

被引数:

5.6K

机构

City University of Hong Kong

学者数:

2.3W

论文数: 3.0W

被引数: 6.1W

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