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Chaos-based image encryption techniques have recently been extensively studied due to their superior properties in efficiency. However, many of the proposed schemes suffer from known/chosen plaintext attacks as the key stream used in diffusion stage is usually solely determined by the key. This paper suggests a chaos-based symmetric image cipher with a plaintext-related key stream generation mechanism...
A novel image encryption scheme based on even-symmetric chaotic maps and skew tent chaotic map was proposed. In the permutation process, a P-box produced by sorting an even-symmetric chaotic sequence is applied to shuffle the position of all image pixels. In the diffusion process, both even-symmetric chaotic maps and skew tent map are used to generate the key stream. Then the pixels in the permuted-image...
Recently approved IEEE 802.15.4a standard defines an ultra-wideband (UWB) based physical layer technique, and performance analysis of UWB systems shows that the pulse waveform will affect the received SINR when multipath interference, multiple access interference and additive white Gaussian noise are considered. In order to obtain an optimal pulse waveform in UWB based wireless sensor networks, the...
In this paper, a secure communication system based on fractional Fourier transform (FrFT) is proposed. Information data is encrypted by a certain order FrFT at transmitter, and then divided into two parts and sent out. The receiver decodes the signal using FrFT with the corresponding order to the transmitter to obtain the original data. Simulation results demonstrate the effectiveness of the proposed...
To minimize cost and size, most commercial digital cameras acquire images using a single electronic sensor (CCD or CMOS) overlaid with a color filter array (CFA) such that each sensor pixel only samples one of the three primary color values. To restore a full-color image from CFA samples, the two missing color values at each pixel need to be estimated from the neighboring samples, a process that is...
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