This paper presents a new color image encryption scheme based on quantum chaotic system. In this scheme, a new encryption scheme is accomplished by generating an intermediate chaotic key stream with the help of quantum chaotic logistic map. Then, each pixel is encrypted by the cipher value of the previous pixel and the adapted quantum logistic map. The results show that the proposed scheme has adequate security for the confidentiality of color images.
A new technique for denoising and compression of multispectral satellite images to remove the effect of noise on the compression process is presented. One type of multispectral images has been considered: Landsat Enhanced Thematic Mapper Plus. The discrete wavelet transform (DWT), the dual-tree DWT, and a simple Huffman coder are used in the compression process. Simulation results show that the proposed technique is more effective than other traditional compression-only techniques.
RC5 is a well-known block cipher notable for its simplicity, speed, suitability for hardware and software implementation, and its low memory requirement. However, RC5 can be broken with various attacks, revealing weak security. This is mainly due to the poor diffusion operation that allows the cipher to be attacked with less complexity than that of the exhaustive search. In this work, we modify the RC5 to give high level security, and adopt it for image encryption by adjusting the structure of both the encryption routine and the key schedule. We generate round keys based on chaos. Then, we strengthen the diffusion operation by making heavy use of rotations. The security analysis of the modified cipher against several attacks is explored from a strict cryptographic viewpoint. Experimental results demonstrate that the modified RC5 provides an efficient and secure way for image encryption.
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