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This paper presents a new chaos-based image cipher using a plaintext-related permutation. The cat map and Lorenz system are employed to shuffle the positions of image pixels and generate the diffusion keystream, respectively. The control parameters of the cat map, i.e. the permutation key, are determined by the Murmur2 hash value of the original image.(More)
In this paper, we propose a novel set of time-hopping (TH) sequences with no-hit zone (NHZ) suitable for quasi-synchronous time-hopping spread spectrum ultra wideband (QS-THSS-UWB) systems. Different from the existing NHZ-TH sequences, the constructed NHZ-TH sequences not only have good TH auto-correlation and cross-correlation properties in the range of(More)
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