KEY DISTRIBUTION METHOD, DEVICE AND SYSTEM

Provided by the present application are a key distribution method, device and system, wherein the method comprises: an identity management server determining whether a terminal has undergone AAA authentication or not according to AAA authentication information in an ID registration request message sent by the terminal; if the terminal has undergone AAA authentication, assigning an ID to the terminal and sending the ID of the terminal to a key management server; the key management server generating a private key for the terminal according to the ID of the terminal and returning the private key to the identity management server; after a first key is generated by the identity management server by negotiating with the terminal, encrypting the ID and the private key of the terminal by means of the first key and sending the same to the terminal; and after receiving the encrypted ID and private key, the terminal decrypting the same by means of the first key and obtaining the ID and the private key therefor. The key