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This paper analyzes security performance of an image encryption algorithmusing 2D lag-complex Logistic map (LCLM), which adopts it as a pseudo-randomnumber generator, and uses the sum of all pixel values of the plain-image asits initial value to control the random combination of the basic encryptionoperations. However, multiple factors make the final pseudo-random sequencescontrolling the encryption process may be the same for different plain-images.Based on this point, we proposed a chosen-plaintext attack by attacking the sixencryption steps with a strategy of divide and conquer. Using the pitfalls of2D-LCLM, the number of required chosen plain-images is further reduced to$5\cdot\log_2(MN)+95$, where $\mathit{MN}$ is the number of pixels of theplain-image.

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