Cryptanalyzing an Image Encryption Algorithm Underpinned by 2D Lag-Complex Logistic Map

08/14/2022

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by   Chengqing Li, et al.

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This paper analyzes security performance of an image encryption algorithm using 2D lag-complex Logistic map (LCLM), which adopts it as a pseudo-random number generator, and uses the sum of all pixel values of the plain-image as its initial value to control the random combination of the basic encryption operations. However, multiple factors make the final pseudo-random sequences controlling the encryption process may be the same for different plain-images. Based on this point, we proposed a chosen-plaintext attack by attacking the six encryption steps with a strategy of divide and conquer. Using the pitfalls of 2D-LCLM, the number of required chosen plain-images is further reduced to 5·log_2(MN)+95, where 𝑀𝑁 is the number of pixels of the plain-image.