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In recent years many chaos-based image cryptosystems are proposed. As encryption process is applied to the whole image, it is difficult to improve the efficiency. In this paper, wavelet decomposition is used in our algorithm to concentrate the main information of image to the low frequency part. Then high-strength chaotic encryption is applied. After that,(More)
In traditional block cipher, S-box is used in many algorithms while the S-box is kept unchanged, so that the weakness of S-box can be pre-analyzed. In this paper, an image encryption algorithm, in which S-box is dynamically constructed, based on 3D chaotic cat maps and Chebyshev map is proposed. First, two-dimensional Arnold map is generalized to 3D for(More)
In this paper, a new index-based symmetric DNA encryption algorithm has been proposed. Adopting the methods of Block-Cipher and Index of string, the algorithm encrypts the DNA-sequence-based plaintext. First, the algorithm encodes each character into ASCII codes. And then, according to the nucleotide sequence, the researcher should convert it to the DNA(More)
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