Identity authentication method, identity authentication device, and computer-readable medium

The embodiment of the present application discloses an identity authentication method,an identity authentication device and a computer-readable medium. The method comprises the following steps: the second user node obtains the first identity mapping information corresponding to the first user address identification from the block chain according to the first user address identification of the first user, the first identity mapping information including the first user address identification, the first public key and the first identity fingerprint; the second user node obtains the first identitymapping information corresponding to the first user address identification from the block chain according to the first user address identification. Encrypting the second public key of the second userby using the first public key, obtaining an authentication request, and broadcasting the authentication request to the whole network; receiving identity feedback information; the feedback informationis verified according to t