Abstract
This paper analyzes the security of a novel image encryption scheme with a permutation–diffusion structure, which is based on Brownian motion and PWLCM chaotic system. By applying chosen plaintext, we demonstrate that a hacker can determine the permutation vector and the diffusion sequence used, respectively, in permutation and diffusion procedure, which can be exploited to reveal the plain image. The effectiveness of the proposed chosen plaintext attack is supported by concise theoretical analyses and is verified by experimental results.
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