Privacy identity authentication method based on space-time certification in multilateral transaction environment

The invention provides a privacy identity authentication method based on space-time certification in a multilateral transaction environment, and the method comprises the steps: receiving a registration request sent by a client through an identity authentication server, and enabling the registration request to be generated through first user information; wherein the identity authentication server comprises first key pairs which are matched with each other; generating a registration ID according to the registration request, and sending the registration ID to the client; the identity authentication server stores a second key pair sent by the client, and the second key pair is generated by matching the registration ID of the client; login information sent by the client is received and verified based on the zero-knowledge proof, and the login information is generated by the client according to the registration ID and second user information; wherein the identity authentication server comprises a data storage serve