An identity authentication method is provided. The method comprises receiving request information transmitted by an online terminal device for determining neighbor network devices and determining at least one neighbor network device of the online terminal device according to the request information, identifying at least one credible neighbor network device of the online terminal device from the at least one neighbor network device and identifying at least one weighted neighbor network device of the online terminal device from the at least one neighbor network device, and computing a credibility score of the online terminal device according to a number of the credible neighbor network device and a number of the weighted neighbor network device, generating authentication notification information according to the credibility score, the authentication notification information indicating whether the online terminal device passes identity authentication, and transmitting the authentication notification information to the online terminal device.