Abstract
Discrete wavelet chaotic watermarking will be presented together with dual watermarking to protect information security and digital piracy against the malicious attacks (e.g. entropy attack and ciphertext attack). Discrete Wavelet Transform (DWT) watermarking is applied initially, whose decomposition components are subject to chaotic mixing, via the chaotic Logistic Map watermark generator. To further enhance the secure transmission of information content, dual chaotic watermarking is performed next by employing the 4D hyperchaotic map. Qualitative and quantitative comparisons are made between DWT based chaotic watermarking and dual chaotic watermarking to evaluate the merits and drawbacks of chaotic watermarking. A typical list of information metrics is selected, containing discrete entropy, energy, correlation, and mutual information as well as Number of Pixel Change Rate (NPCR), in order to analyze the information integrity at both spatial domain and frequency domain.
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