Application of Conservative Hyperchaos in Digital Image Encryption

Abstract

Abstract: We propose a digital image encryption algorithm based on conservative hyperchaotic signals. Based upon a 5-dimensional conservative hyperchaotic system, the algorithm generates a 5-channel time series to perform scrambling in both pixel-level and bit-level, and subsequently an XOR operation on scrambled RGB components of the original image. On this basis, an encrypted image is obtained with time series of one of the channels to perform a forward XOR operation and S-BOX processing, a reverse XOR operation, S-BOX processing, and scrambling. Finally, the encryption algorithm is evaluated with several security indicators such as histogram, information entropy, and key space. Performance of the encryption algorithm in digital image encryption is compared with that of a 5-dimensional dissipative hyperchaotic system. It shows that the algorithm based on conservative chaos has higher safety and reliability.

Key words: conservative chaos, Hamiltonian, image encryption and decryption, permutation and scramble, safety analysis

CLC Number:

TP751.1

XUE Wei, ZHANG Yongchao. Application of Conservative Hyperchaos in Digital Image Encryption[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2020, 37(4): 497-504.

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