Aiming at the problem that existing MQTT protocol lacks effective identity authentication and data plaintext transmis-sion,an MQTT security protection scheme is designed based on domestic cryptography algorithms SM2,SM3 and SM4.Two-way identity authentication between the client and MQTT Broker is realized by SM2 algorithm.SM4 algorithm is used to encrypt the username,password,and message contents of subjects in MQTT protocol.SM3 algorithm is used to ensure the integrity of data transmitted by MQTT protocol.Applying self-controllable domestic cryptography technology to MQTT protocol can effectively improve the security protection capability of the protocol.The security analysis and experimental results show that the proposed scheme can not only solve the security problem of MQTT protocol,but also meet the practical application requirements.
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