Abstract
An improved substitution-diffusion based image cipher is proposed using chaotic standard maps. The first stage consists of row and column rotation, the second stage consists of the mixing the properties of the horizontally and vertically adjacent pixels, respectively, and XORing with an intermediate chaotic key stream (CKS) image which is generated using chaotic standard map, both stages are controlled by combination of secret keys and plain image. Various types of analysis performed such as entropy analysis, difference analysis, and statistical analysis. This proposed technique is tradeoff between security and time. The experimental results illustrate that performance of this is highly secured.
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