A Novel Weakness of SM2 Algorithm

In 2023, Fan et al. proposed an article "Weakness of Enhanced DNA and ElGamal cryptosystem for secure data storage and retrieval in cloud" which it found a leakage by Thangavel and Varlakshmi's scheme. In this paper, the authors would like to use this method to check SM2 algorithm, and claim their viewpoint is correctness. We also demonstrate that this can be unsafe when the XOR operation is used in a special environment. Mathematical proof and experimental proof must be demonstrated in this article, which is our method. The results showed that the SM2 algorithm not safe.