The information security level protection of the Ministry of Public Security is above Grade III certification, the trusted cloud service certification of the Ministry of Industry and Information Technology, and the ISO2700 1 certification. In ensuring the legal effect of electronic signature, the third-party signature machine should have the following qualifications: information security level protection certification of the Ministry of Public Security, trusted cloud service certification of the Ministry of Industry and Information Technology, and ISO2700 1 certification. In order to ensure the authenticity of the signature.