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Chaos-based encryption for fractal image coding |
Yuen Ching-Hung(袁正雄)† and Wong Kwok-Wo(黄国和) |
Department of Electronic Engineering, City University of Hong Kong, Hong Kong, China |
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Abstract A chaos-based cryptosystem for fractal image coding is proposed. The Rényi 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 fractal 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 Rényi 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.
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Received: 25 July 2011
Revised: 18 August 2011
Accepted manuscript online:
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PACS:
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05.45.-a
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(Nonlinear dynamics and chaos)
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05.45.Gg
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(Control of chaos, applications of chaos)
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05.45.Df
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(Fractals)
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Fund: Project supported by the Research Grants Council of the Hong Kong Special Administrative Region, China (Grant No. CityU 123009). |
Cite this article:
Yuen Ching-Hung(袁正雄) and Wong Kwok-Wo(黄国和) Chaos-based encryption for fractal image coding 2012 Chin. Phys. B 21 010502
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