CA certificate dual-authentication method applied to related agreement signing of patient in diagnosis and treatment process

The invention discloses a CA certificate dual authentication method applied to related agreement signing of a patient in a diagnosis and treatment process, and belongs to the technical field of agreement signing, and the method comprises the following steps: S1, an uploading party and a signing party send a connection request; s2, the third-party platform sends the certificate; s3, the uploading party and the signing party check the certificate; s4, the uploading party and the signing party verify the certificate; s5, the third-party platform verifies the certificate; s6, acquiring communication keys of the two parties; s7, the uploading party encrypts the uploading protocol; s8, the signing party encrypts the signing agreement; s9, backing up a third-party platform protocol; according to the invention, a patient signs a plurality of related agreements, if the agreements do not leave the range of the camera on the way, the agreements can be signed all the time, the signing server does not send the identity ve