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An enhanced variable-length arithmetic coding and encryption scheme using chaotic maps

JOURNAL OF SYSTEMS AND SOFTWARE 2013年第5期86卷 1384-1389页

作者： Lin, Qiuzhen Wong, Kwok-Wo Chen, Jianyong City Univ Hong Kong Dept Elect Engn Kowloon Tong Hong Kong Peoples R China Shenzhen Univ Coll Comp Sci & Software Engn Shenzhen City Key Lab Embedded Syst Design Shenzhen 518060 Peoples R China

We enhance the simultaneous arithmetic coding and encryption scheme previously proposed by us. By encoding a block of variable number of symbols to a codeword within the length of the computation register, the operating efficiency has been substantially improved. Moreover, the compressed sequence is processed by an additional diffusion operation which strengthens the security of the original scheme by having higher key and plaintext sensitivities. Simulation results show that the enhanced scheme runs faster than the original scheme and the traditional compress-then-encrypt approach at a comparable compression performance. (c) 2013 Elsevier Inc. All rights reserved.

关键词： simultaneous compression and encryption Chaotic map Variable-length arithmetic coding

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A Modified Chaos-Based Joint compression and encryption Scheme

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 2011年第2期58卷 110-114页

作者： Chen, Jianyong Zhou, Junwei Wong, Kwok-Wo Shenzhen Univ Dept Comp Sci & Technol Shenzhen 518060 Peoples R China City Univ Hong Kong Dept Elect Engn Kowloon Hong Kong Peoples R China

An approach for improving the compression performance of an existing chaos-based joint compression and encryption scheme is proposed. The lookup table used for encryption is dynamically updated in the searching process. Once a partition not matched with the target symbol is visited, this and other partitions mapped to the same symbol are reallocated to a nonvisited symbol. Therefore, the target symbol eventually associates with more partitions and fewer number of iterations are needed to find it. As a result, expansion of the ciphertext is avoided, and the compression ratio is improved. Simulation results show that the proposed modification leads to a better compression performance, whereas the execution efficiency is comparable. The security of the modified scheme is also analyzed in detail.

关键词： Chaos compression cryptography simultaneous compression and encryption

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simultaneous Arithmetic Coding and encryption Using Chaotic Maps

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 2010年第2期57卷 146-150页

作者： Wong, Kwok-Wo Lin, Qiuzhen Chen, Jianyong City Univ Hong Kong Dept Elect Engn Kowloon Tong Hong Kong Peoples R China Shenzhen Univ Dept Comp Sci & Technol Shenzhen 518060 Peoples R China

Based on the observation that iterating a skew tent map reversely is equivalent to arithmetic coding, a simultaneous compression and encryption scheme is proposed in which the chaotic map model for arithmetic coding is determined by a secret key and keeps changing. Moreover, the compressed sequence is masked by a pseudorandom keystream generated by another chaotic map. This two-level protection enhances its security level, which results in high key and plaintext sensitivities. The compression performance of our scheme is comparable with arithmetic coding and approaches Shannon's entropy limit.

关键词： Arithmetic coding chaotic map simultaneous compression and encryption

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