Cryptanalysis of a multistage encryption system

@article{Li2005CryptanalysisOA,
  title={Cryptanalysis of a multistage encryption system},
  author={Chengqing Li and Xinxiao Li and Shujun Li and Guanrong Chen},
  journal={2005 IEEE International Symposium on Circuits and Systems},
  year={2005},
  pages={880-883 Vol. 2}
}
This paper analyzes the security of a new multistage encryption system (MES) recently proposed in ISCAS'2004. It is found that MES is insecure against a differential chosen-plaintext/ciphertext attack. Experiments are given to support the proposed attack. It is also pointed out that the security of MES against brute-force attacks is not sufficiently high. 

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