Abstract
In this paper, we proposed an effective and fast image encryption algorithm based on Chaos and interweaving of ranks. The encryption starts from four directions: top, bottom, left and right by interweaving pairs of rows and columns to achieve a better performance of shuffling and diffusion. Four pointers are designed to scan the plain image, and another four generated by logistic map are appointed to determine the rows or columns to be switched. Two pairs of columns permute within each pair after two pairs of rows did, at the same time, a row or column of pixels are encrypted by different keys so that shuffling and diffusion stage are combined into one and performed simultaneously. The initial value of logistic map is generated by a checksum of the plain image so that the proposed algorithm can resist certain attacks. Experiments and analysis present that the proposed algorithm has good feature of security and speed; what is more, it is capable of withstanding differential attacks, statistical analysis, known-plaintext and chosen-plaintext attacks.
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