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Article type: Research Article
Authors: Fu, Chong1; * | Zhang, Gao-Yuan1 | Zhu, Mai1 | Chen, Jun-Xin2 | Lei, Wei-Min1
Affiliations: [1] School of Computer Science and Engineering, Northeastern University, Shenyang 110004, China | [2] Sino-Dutch Biomedical and Information Engineering School, Northeastern University, Shenyang 110004, China. E-mails: [email protected], [email protected], [email protected], [email protected], [email protected]
Correspondence: [*] Corresponding author.
Abstract: This paper suggests a new fast colour image cipher to meet the increasing demand for secure online image communication applications. Unlike most other existing approaches using a permutation-substitution network, the proposed algorithm consists of only a single substitution part. The keystream sequence is generated from a 4-D hyperchaotic system, whose initial conditions are determined by both the secret key and the SHA-224 cryptographic hash value of the plain-image. Favoured by the avalanche effect of hash functions, totally different keystream sequences will be generated for different images. Consequently, desired diffusion effect can be achieved after only a single round of substitution operation, whereas at least two encryption rounds are required by the state-of-the-art permutation-substitution type image ciphers. We also demonstrate the computational efficiency of the proposed algorithm by comparing it with the AES encryption algorithm. A thorough security analysis is carried out in detail, demonstrating the satisfactory security of the proposed algorithm.
Keywords: colour image cipher, hyperchaotic system, hash function, XOR encryption
Journal: Informatica, vol. 29, no. 4, pp. 651-673, 2018
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