The present invention relates to a signature method using identity information, wherein a user private key is divided and stored in a plurality of distributed servers, and the minimum divided private key that can be generated by combining the private keys among the divided private keys is overlapped. A private key is generated using a linear pair function, and relates to a threshold signature method using identity information without a private key generator.;Specifically, the private key authenticated by the authentication server is divided into a plurality (n) of the user's computer, distributed to a plurality of (n) distributed servers, and published, and among the plurality (n) distributed servers in the authentication request server. Receive the divided private key announced by a distributed number of distributed servers or more, and combine the private key using the parallel pair function of the divided private key, and for the combined private key A method of authenticating a user is provided.;User computer, authentication server, authentication key, authentication request server, distributed server
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