Research and Implementation of Hybrid Encryption System Based on SM2 and SM4 Algorithm

In recent years, the mobile platform network communication performance has made significant progress, with an increasingly large user base and market platform. At the same time, it also brings many problems such as the leakage of sensitive information after the loss of smartphones, the theft and tampering of private information. Aiming at the above problems, this paper proposes a hybrid cryptosystem based on the national secret algorithm SM2 and SM4 and its system solution for implementing secure communication. The asymmetric encryption algorithm SM2 and the symmetric encryption algorithm SM4 are combined to encrypt the key and the plaintext information of the symmetric encryption algorithm to achieve the double encryption effect. The experimental results show that the system designed in this paper improves the security of information transmission and key sharing.