Method for unified network and service authentication based on id-based cryptography

A unified authentication method for a device to authenticate a first provider network and a second provider network based on Identity-Based Cryptography where each of the device, the first provider network and the second provider network has a different private key and a same Global Public Key (GPK) issued by a public key generator, the unified authentication method comprising:

• generating and transmitting, by the device, an authentication data package to the first provider network, the authentication data package includes an Authentication Type (Auth. Type) and the second provider network's ID (SP_ID), wherein the Auth. Type comprises a first type wherein authentication involves an element of the first provider network and an element of the second provider network, a second type wherein authentication involves the element of the first provider network, and a third type wherein authentication involves the element of the second provider network;
• in response to receiving the authentication data package, determining, by the element of the first provider network, a type of authentication based on the Authentication Type;
• in response to determining the first type of authentication, generating and transmitting, by the element of the first provider network, a first Authentication Response Message to the device and transmitting the authentication data package to the element of the second provider network based on the SP_ID;
• and
• in response to receiving the authentication data package, generating and transmitting, by the element of the second provider network, a second Authentication Response Message to the device.